EXPLANATION OF THE PLATES AND WOOD-CUTS. 



whorls 7 or 8, convex ; varices obtuse at their edges ; aperture oval ; beak short, 

 obhque. Height 1 inch 4 lines, diameter 1 inch. 



Nearly resembles Ranella bituberculata of Lamarck. 



Loc. Soomrow. 

 Fig. 17. Rostellaria rimosa, (M. C. 91. f. 4, 5, 6, Strombus cancellatus, Lam. Hist. 

 Nat. Vol. vii. t. 212.?) 



The fragment we have before us, is firmly imbedded in the stone, and we are not 

 able to clear the lip so as to ascertain whether it be striated like the lip of the recent 

 Strombus cancellatus, Lam., or smooth and thickened as in Rostellaria rimosa 

 and R. Fissurella, Lam., &c. ; of all these, the species nearest to the fossil is R. 

 rimosa of the London Clay, which is easily distinguished from R. Fissurella, Lam., 

 of the Paris Basin, by being striated all over, and having the canal continued nearly 

 to the apex of the spire, but not curved back. From Strofnbus cancellatus, Lam., 

 this fossil is distinguished by having a tumid varix upon the last whorl, a character 

 also of Rostellaria rimosa, and we are consequently induced to refer the Cutch 

 shell to it rather than to Strombus cancellatus. * 



Linnaeus and his immediate followers did not distinguish between the recent and 

 fossil shells, although the recent one [Strombus decussatus. Lam.) has the lip striated 

 within, and is placed by Lamarck in another genus, while Deshayes in the 

 " Coquilles fossiles des environs de Paris," unites the French fossil and the two 

 English ones under one name, although they are perfectly distinct ; probably he 

 has not examined English specimens. We find the characters very constant, and 

 easily observed when once pointed out. The analogous shells of Bordeaux are 

 equally distinct. About the same size as R. rimosa, M. C, from Barton. 



Loc. Soomrow. 

 Fig. 18. Rostellaria rectirostris. (Lam. Hist. Nat. Vol. vii. 192.) The elongated form 

 induces us to refer this fossil to the recent R. rectirostris, in preference to any 

 other species. 



Loc. Soomrow. 

 Fig. 19. Strombus deperditus. Turbinate, tuberculated, and transversely striated; 

 tubercles united by a slight carina gradually increasing in size ; hp thickened, 

 produced above into a short pointed lobe. Height 2| inches, diameter 1 inch 4 

 lines including the wing. 



Much like Strombus Gallus, Linn., and aS". bituberculatus, Lam., but the tubercles 

 are of an equal size on the last whorl and not much larger than on the spire. The 

 aperture is not much dilated, so that the wing is rather small. It appears to 

 be a very common shell in the Runn, but perhaps there are several species, as 

 many of the specimens are so firmly attached to the stone, and so much concealed, 

 that the distinguishing marks cannot be traced. 



Loc. Soomrow. 

 Fig. 20. Strombus nodosus. Turbinate, elongated, tuberculated, transversely and longi- 

 tudinally striated; tubercles equal, numerous, prominent, obtuse. Height If inches. 



Distinguished by the rounded tubercles, of which there are about 12 to each 

 whorl — and the elongated spire. 



