g42 Notes on Pondicherry Fossils. 



mine the species until more perfect specimens be found. 

 One of the species is umbilicate, mouth wider than high, 

 and the siphuncle central ; the other is not umbilicate, with 

 the whorls compressed, and the height of aperture equal to its 

 width. This species may prove to be identical with Nautilus 

 pompilius, a recent species. A third is without umbilicus^ but 

 in other respects like the first. In all, the septa are numerous 

 and straight at their insertion ; but concave on their interior 

 surface, and convex posteriorly. 



Cuculla crassatina? Desh. — A single valve of this or an adjoining 

 species of the Paris basin. The occurrence of this fossil, should it 

 prove to be the same species, is a very interesting fact, particularly as 

 Mr. Deshays mentions having apparently the same fossil from Brazil. 

 The specimen from Pondicherry is however imperfect, so that some 

 doubt as to its identity must still exist. 



Area Cunliffeii, J. M. — Length of the hinge equal to the height of the 

 shell, and to half its length. Posterior margin narrow and almost 

 pointed, anterior margin rounded, upper surface transversely striated. 

 There are several specimens of this fossil in the collection. 



Area crassatina, J. M. — Length of the hinge equal to about half the 

 height, and one-third of the length of the shell ; surface striated trans- 

 versely. There is but one specimen of this fossil in the collection, and 

 that not very perfect. 



Pileopsis plana, J. M. — A small depressed smooth species, the height 

 exceeding the length, very thin and generally imperfect, with a pearly 

 lustre, either the same or very nearly allied to a shell in the limestone 

 of the coal formation at Cherra. 



Pileopsis rotunda, J. M. — A large smooth shell, the length nearly 

 equal to the height, upper surface uniformly arched. 



Paludina, allied to Paludina Semicarinata. Brand. Desh. Coq. Fos. Pl.xv. 

 Fig. 11. Many species of this genus are now living in fresh waters, some in 

 India. It is much to be regretted, that the only specimen in the collec- 

 tion is not sufficiently perfect to allow of the species to which it be- 

 longed being accurately determined ; but the presence of a fresh-water 

 shell is important, as tending to shew the deposit to have taken place 



