Rock, and resting upon it. They are stratified, the strata running N. E. and S. W. nearly. At the foot of a range of pretty high hills, behind, or rather N.N. W. of Algeziras, and 10 miles N. W. from Gibraltar, I found some masses of a large granular red and white sandstone, very like the old red sandstone. These masses increased in number as I ascended the hills; but as I did not proceed to the top, I did not discover the rock in situ.

From the circumstance of the plague raging in different parts of Spain, at no great distance from Gibraltar, at the time of my visit to this place, no person was allowed to be absent from Gibraltar longer than 24 hours, a time too short to admit of an accurate or extensive examination of this part of the country.

ART. XIII.-List of the Steam-Boats plying on the River

Clyde in 1822.

In a Letter from JAMES SMITH, Esq.

F. R.S. E. to Dr BREWSTER.

MY DEAR SIR,

AGREEABLY GREEABLY to your desire, I send you a list of the steamvessels at present plying upon the River Clyde. The whole of them, except the Liverpool boats, sail from Glasgow to the ports specified in the 2d column; the Liverpool boats go no farther up the river than Greenock. The 3d column contains the number of horse-power of the engines; the 4th column the tonnage, from which the space occupied by the machinery is deducted; and the last column contains the tonnage, calculated in the same manner as other ships. The boats which ply between Glasgow and Greenock generally make two, and frequently three trips a day; and hitherto not a single passenger has lost his life, either from sea-risk, or the nature of the machinery. I am, my Dear Sir, yours always,

།

}

JORDANHILL, 14th May 1822. S

JAS. SMITH,

LIST of Steam-Boats Plying on the River Clyde in 1822.

(82)

ART. XIV.-Descriptions of two new Genera of Nepaul Plants. By Mr DAVID DON, Curator of the Lambertian Herbarium*

A SPECIES belonging to one of the new genera now to be

described, has been published long ago by Roxburgh †, under the name of Incarvillea parasitica. It is surprising that so acute an observer should have referred his plant to Incarvillea, a genus with which it scarcely agrees in one single point. The genus in question, which I propose to call Trichosporum, is remarkable for the singular structure of its capsule and seeds. The capsule is a span or even a foot long, ensiform, compressed, 4-celled, 2-valved; when ripe, the valves separate from each other, along their whole length: the septum finally bursts at the margin, continuing, however, always firmly fixed at its middle; the sides then become erect, and embrace each other. The seeds are very numerous, oblong, cylindrical, and rough, with minute warts; emitting at the base one. and apex two very long silky hairs. These hairs are consequently so numerous, that they completely cover the seeds, as in plants of the Order Asclepiadea. Lysionotus, the other genus, agrees in many respects with Trichosporum, but differs in the two-celled valves of the capsule bursting at the suture on the back; the seeds being smooth, and attenuated at both ends into a caudiform capillary appendage; and in having a 5-leaved calyx, and also in habit. The genus Didymocarpus of Wallich comes very near, both in habit and structure, to Lysionotus; but is advantageously distinguished from it, by its smooth ovate seeds, destitute of any appendage, and by its monophyllous 5-toothed calyx. These three genera form a small family of plants, to which the name of Didymocarpea may be given. They differ essentially from the Bignoniacea, as limited by Mr Brown, to which they are nearly related, in having a simple clavate stigma, pendulous, minute, ovate or cylindrical, frequently appendaged seeds; in the structure of their capsule, and form of their embryo. The plants which compose this little family, are all natives of Nepaul

* Read before the Wernerian Society, 26th January 1822.

+ Plant. Coromandel. t. 291.

and the East Indies, and are mostly dwarfish herbaceous perennial plants. The genus Chirita of Dr Francis Hamilton, which includes the Didymocarpus speciosa and bifolia of Wallich, has a 5-parted calyx, and a bifid stigma. They are small herbaceous perennials, with simple stems; opposite serrated or crenated leaves, and solitary peduncled, axillary flowers. Their fruit, however, and consequently the structure of their seeds, is unknown to me; but their habit, and having a divided stigma, would incline me to place them among the Scrophularinæ, rather than in this order.-I shall now proceed to give descriptions of Trichosporum and Lysionotus, as well as the character of the family to which they belong.

Nat. Ord. DIDYMOCARPEÆ.

Calyx campanulatus, 5-fidus rariùs 5-phyllus, æqualis. Corolla basi tubulosa, supernè ampliata, campanulata: limbus 5-lobus, sub-bilabiatus: lobis rotundatis, in æstivatione imbricatis.

Stamina 4 didynama, quorum 2 in Didymocarpo sterilia: filamenta glabra, capillaria, fornicata: antheræ ovales v. oblongæ, nudæ, biloculares, per paria parallelo-adnatæ, in Trichosporo apice tantùm conniventes.

Pistillum 1: germen ensiforme: stylus filiformis: stigma simplex, clavatum sæpiùs excavatum, subinfundibuliforme. Capsula siliquosa, compressa, bivalvis, 4-locularis, dissepimento duplici, membranaceo: valvis primò discedentibus: loculis usquè gemmatis tardiùs ad commissuras dorsales v. marginales dehiscentibus.

Semina∞ minuta, pendula, ovata v. cylindracea, nuda aut rariùs in caudam brevem, capillarem utrinque desinentia v. pilos longissimos emittentia, glabra rarissimè scabra: albumen nullum.

Embryo minutus, teres, inversus: cotyledones oblongi embryone plùs duplò breviores: radicula superior, cylindracea. Herbæ perennnes, terrestres, acaules rariùs caulescentes v. frutices parasitici, foliis oppositis integerrimis coriaceis glabris: in herbis, folia plerumque radicalia, cordata, crenata v. serrata, hirsuta, in caulescentes terna. Flores umbellati, pur

purei, rosei v. rubri; in herbis, umbellæ dichotoma, basi involucro et involucello diphyllo munitæ.

TRICHOSPORUM *.

INCARVILLEE species, Roxburgh.

Calyx campanulatus, 5-fidus, ebracteatus: segmentis æqualibus. Corolla tubulosa, incurva, basi angustata, supernè ampliata: ore obliquo, 5-lobo: lobis plerumque rotundatis, subæqualibus in æstivatione imbricatis. Stamina 4, longè exserta, fertilia, 2 quorum parùm breviora: filamenta capillaria, fornicata, glabra: antheræ ovales v. oblongæ, nudæ, biloculares, obtusæ v. subacutæ, basi fissæ, apice per paria conniventes, internè post dehiscentiam lamellatæ. Pistillum 1 rectum: germen compressum, ensiforme, sensìm desinens in stylum filiformem: stigma simplex, clavatum disco excavato infundibulari, ore integerrimo. Capsula siliquæformis, compressa, (palmaris pedalisve), pendula, ensiformis, acuminata, bivalvis, 4-locularis dissepimento duplici: valvis planis per totam longitudinem primò discedentitibus, extus lævibus intus lacunoso-rugosis: septa tenuia, papyracea, per medium arctissimè affixa, demùm ad oras dehiscentia, postmodo lateribus inflexo-approximatis. Semina ∞ oblongo-cylindracea pendula, ad septa imbricatìm affixa, papillis minutissimis scabra, ad baseos 1 apices 2 pilos longissimos tenuissimos sericos emittentia, inter quos occulta.

Frutices parasitici. Caules simplices, teretes, geniculati, glabri, secus truncos arborum in more Epidendrorum scandunt et ad geniculos fibras simplices subsolitarias sæpiùs enascuntur. Folia opposita, petiolata, lanceolata, acuminata, carnosa, integerrima, glabra. Flores terminales umbellati. Pedicelli breves, uniflori basi unibracteolati. Corollæ rubra, extus pilosæ figurâ ferè omninò Digitalis. Toto cœlo diversa est Incarvillea Juss. cui calyx tribracteatus, antheræ biloba, stigma bilamellatum, -capsula bivalvis bilocularis, dissepimentum simplex valvis oppositum, semina plana, suborbiculata membranâ latiusculâ cincta; caulis erectus ramosus herbaceus, foliis laciniato-pinnatis

• Named Trichosporum, from gig, reixes, hair; and σñoga, seed, on account of the seeds being furnished with long hairs.