Description of the Landes of Acquitania. I] 
interspersed, Tilia europea, Betula Alnus, Juglans regia, Platanus 
occidentalis, P. orientalis, Salix triandra, S. pentandra, S. vitellina, 
and other species, Populus tremula, P. latifolia, &c. 
(To be continued in the next Number. ) 

ART. I1.—Description of Five New British Species of Shells. 
By Caprain THomas Brown, F.R.S.E. F.L.S. M.R. PS. 
M.W.S. &c. &c. 
1. Anatina brevirostris. 
Shell very convex, transversely ovate-oblong, posterior side round- 
ed, anterior side abruptly tapering to an abbreviated beak. It has 
one large elevated recurved cardinal tooth in the right valve; 
cartilage impressions very deep; margins somewhat plain; umbo 
small, pointed, and slightly turned towards the anterior side. 
The whole interior is of a pale purple colour, darker towards the 
extremities; exterior covered with a fawn-coloured epidermis, 
which is transversely truncated and semistriated, with a slight me- 
tallic lustre. : | 
The size of the shell is 3-8ths of an inch in length, and half an 
inch in breadth. Plate I. Fig. 1. the shell represented the size of 
nature. Fig. 2. right valve magnified. Fig. 3. left valve ditto. 
Fig. 4. a section shewing the thickness of the shell. 
This new and interesting species was discovered by my friend 
James Gerard, Esq. in the Frith of Forth. The Anatina longi- 
rostris of Lamarck’s An. sans Vert. vol. v. p. 463. together with 
this shell, might very properly be formed into a distinct section. 
2. Cyclas fontinalis. 
Testa oblique corditata, veniricosa, substriata, pellucida, um- 
bone subacuta. 
Cyclas fontinalis Drap. Hist. des Moll. p. 130. pl. x. fig. 11, 12. 
——--—_—___—— Lam. An. sans Vert. vol. v. p. 599. No. 7. 
Pisidium fontinale, Pfeiffer Land und Wass. Sch. p. 126. 
Shell sub-oval, oblique, very convex, pellucid, and covered with 
extremely fine concentric strie ; beak placed nearer to one side, 
with two lateral teeth and one central in the right valve, and two 
oblique teeth and a single lateral one in the other. 
Fig. 5. size of nature. Fig. 6. a magnified view of the left valve. 
Fig. 7. a section magnified, shewing the thickness of the shell. 
This species is of a pale ash colour, little more than the eighth 
of an inch in length, and somewhat broader. It was found in a 
ditch near Duddingston Loch, by James Gerard, Esq. It has very 
much the appearance of the Cyclas obiqua, but is much more con- 
vex than that shell, in proportion to its size, and less oblique. 
This is the first time its habitat has been ascertained as British. 
