1859.] nisLOP — fossil shells of nagfttb. 171 



time, it is characterized by such a decided perforation, as to demon- 

 strate that it has no affinity with either that or any other species of 

 Pahtdina. Judging from its form, which so greatly resembles that 

 of the species last described, I am inclined to place it in the same 

 genus. And it is interesting to discover that, though the American 

 existing species of Valvata already referred to, and the fossil V. mul- 

 tiformis, are the only ones which arc known to possess as many as 

 three obvious carina, yet there is a tendency to this structure even 

 in the common species V. piscinalis, which, under a lens, exhibits 

 several rudimentary carina?. Our fossil would be ranked with the 

 V. striata of Philippi, which it much resembles, were it not that the 

 position of the .Sicilian shell itself is doubtful, it being supposed to 

 he very improbable that a freshwater mollusc should be found 

 entombed with marine organisms ; but perhaps the occurrence of 

 a single specimen of Pahtdina normalis in similar circumstances, at 

 Kateru, may go far to obviate this objection. If we look to lacus- 

 trine deposits for analogues, I would point to the Grignon beds, 

 where we meet with a univalve which, under the specific name of 

 cormi-jxtstoris, Lamarck has classed with the genus C>/clostonut. But 

 as this shell is extremely like the Indian one now under considera- 

 tion, and as the latter cannot, as I have remarked, belong to a ter- 

 restrial genus, I would take the liberty of referring them both to the 

 only lacustrine genus which seems at all likely — I mean Valvata. 

 And it is not a little remarkable that at Grignon, where C. cornu- 

 jjastoris occurs, there is also found ft spiruloides of Lamarck, which 

 Deshayea docs not consider to be a Ct/clostoma, but which, as it 

 appears to me, is obviously auother species of Valvata ; and thus it 

 would seem that we have an association of forms at a locality in 

 France, which finds its counterpart in the combination of V. mi'.lti- 

 carinata and V. minium at Little Tisti in Central India. 



Valvata decollata, sp. nov. PI. V. figs. 10 a, 16 b. 



V. testa ovato-eonicn, paululum elongate, tenuiter multacarinate ; apioe trun- 

 cate); anfractibus fortasse !•, COnvexifl, inter carinas vertiraliter elegantisaime 



striatis; apcrtura ovata. Loiil:. 45? ; lat. '28 une. 



At Takli, rather rare. This species agrees with V. urUcariniferd 

 and V. mtdtiearinata in the size of its ambitious, and with the latter 

 in great measure in the character and number of its carina, hut it 

 differs from both in the elongation of its form. All the specimens, 

 both old and young, thai I have Been are truncate. This species 

 evidently departs more widely than any other from the typical form 

 of Valvata. 



Scccixea Naoiurexsis, sp. nov. PL V. fig. 17. 



.9. testa parvnla, ovato-oblonga ; spira mediocriter exaerta ; apioe obfosiafloalo : 



anfrnetiiius 4, oonvexis, oDiiqaia, ultimo spiram multo superante; aporturu 

 ovata. Long '21 : lat. '16 una 



Very rare, only one specimen, and that a calcedony cast, having 



been discovered at Telankhcc/i, along with the slender, striped 

 l'aludinas. 



