168 PROCEEDINGS OP THE GEOLOGICAL SOCIETY. [June 15, 



only as a calcedonoiis cast, so that it cannot be determined, whether 

 the shell was striped, though analogy would lead to the belief that 

 it was. 



Paltjdina sttbcyeestdkacea, sp. nov. PI. V. fig. 6. 

 P. testa elongato-turrita, unifasciata ; apice subacuto ; anfractibus 8-10, convexius- 



culis ; apertura parva, ovata, angusta, superne angulata ; labii margine sub- 



reflexo. Long. 45 ; lat. -17 unc. 

 . TelankhecZi, rather rare. The dimensions of the largest specimen 

 are given above. It has, however, lost at least two of its upper 

 whorls ; otherwise it would have exceeded half an inch in length. 

 Palttdina Sankeyi, sp. nov. PI. Y. fig. 7. 



P. testa subfusiformi, unifasciata ; anfractibus 9, valde sive parum convexis ; 



sutura impressa; apertura ovata, superne angulata. Long. 4; lat. - 17 unc. 



Telankhedfi, somewhat common. With this interesting species I 

 have, associated the.name of Captain Sankey, of the Madras Engineers, 

 who investigated with much success the deposit in which it is found, 

 and has since earned the highest honour at the hands of our Queen, 

 by his distinguished valour in recent Indian campaigns. 

 - The five species just described constitute a group requiring more 

 special notice. 



It may be supposed that the differences between P. Deccanensis 

 and P, Wapsharei are not so great as to warrant their being made 

 into two separate species. Variety in the colouring of a Helix or 

 Bulimus I admit not to be a sufficient ground for specific distinction ; 

 but I am not ^aware that there is the same latitude in freshwater 

 genera. In the genus Paludina, it is well known that, when a species 

 is banded, there is no great agreement in the number of stripes ; but 

 in all the Indian species that have fallen under my observation, I 

 have never found one wholly destitute of stripes that is usually pos- 

 sessed of them. This seems also to have been the rule in former 

 days. Of the three species, P. acicularis, P. subcylindracea, and 

 P. Sanlceyi, I have discovered no well-preserved specimens unstriped, 

 in the same matrix as yielded the striped specimens. Now, at 

 KarwacZ, in the very same fragment of rock, and equally well-pre- 

 served, we meet with two sorts of specimens, — one larger, thicker in 

 the' shell, and unstriped ; the other smaller, thinner, and sometimes 

 exhibiting one band of colour, sometimes two. To me it appears 

 there is as much difference between these two forms as between 

 many others that are properly reckoned specifically distinct. 



The difficulty about the remaining forms, which I have grouped 

 with P. Wapsharei, relates to a still higher question — that of genus. 

 At first sight the slenderness of these four species, taken along with 

 the more or less reflexed character of their inner lip, would lead to 

 the conclusion that they belong to Bulimus ; and with this infer- 

 ence woidd agree the position of the coloured stripes which three 

 of them exhibit, and which it is presumed all possessed. Por some 

 time I entertained this view ; and I find that it has commended itself 

 to most of my friends in this country, who have examined the 

 specimens. But the abundance in which they have been procured 

 at Telankhecft, almost to the exclusion of other sheiks, forbids pur 



