170 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Julie 15, 



equalled only by the generosity with which he bestows on others the 

 valuable specimens, both recent and fossil, that he has discovered. 



Paludika Yirapai, sp. now PL Y. fig. 12. 



P. testa turrita ; apice acuto, plerumque truncate ; anfractibus 8, forsitan ad 10, 

 complanatis ; sutura sat impressa ; apertura ovata ; peristomate interrupto ; labii 

 margine reflexo. Long. 1*1 ? ; lat. - 5 unc. 



Takli, with the last, — the chief difference between the two being, 

 that in young specimens as well as old of P. Rawest the base is 

 rounded, whereas iu P. Virapai, as might be expected from the flat- 

 ness of the whorls, it is angular. In affixing the specific name I wish 

 to acknowledge the services of Yirapa, my collector, a native re- 

 markable for intelligence and acuteness of observation. 



Yalvata minima, sp. nov. PI. Y. fig. 13. 



V. testa perpusilla, discoidea, subtus late umbilicata ; anfractibus 3, rotundis, ver- 

 ticaliter tenuissinie striatis ; apertura rotunda. Diam. -05 unc. 



At Little Tisti, Karwad, Butara, and Karuni, somewhat frequent. 

 At the two localities first mentioned, the specimens retain the deli- 

 cate shell, with its very fine striation. This is the most diminutive 

 species of Valvata that I have seen. It is considerably smaller than 

 the young of V. cristata, which has received the specific name of 

 V. minuta. The figure is magnified. 



Yalvata unicarinieera, sp. nov. PL Y. fig. 14. 



V. testa turbinato-conoidea ; apice subacute ; anfractibus 5-6, subventricosis, infra 

 suturam unicarinatis ; umbilico magno; apertura subrotunda. Long. '4; 

 lat. -27--3S unc. 



This shell is considerably more elevated in the spire than any 

 recognized species of Valvata with which I am acquainted ; still 

 the resemblance which its carina bears to those of V. tricarinata of 

 Say, and its funnel-shaped umbilicus, remove from my mind all hesi- 

 tation in referring it to that genus. The American species displays 

 two carina on the exposed part of the whorl ; whereas our fossil 

 species has only one, which occupies the position of the upper carina 

 in V. tricarinata. I believe it has a carina in the part of the whorl 

 that is covered up, as is the case with the other ; but cannot speak 

 definitely, owing to the difficulty of detaching the shell entire from 

 the siliceous matrix in which it is found in both of its localities, 

 Butara and MalanwacZa. At the former place it occurs along with 

 V. minima. 



Yalvata melticarinata, sp. nov. PL Y. figs. 15 a, 15 b. 



V. testa turbinato-conoidea, niulticarinata ; apice subacute ; anfractibus 6, ven- 

 tricosis, inter carinas verticaliter ornate striatis ; umbilico magno ; apertura 

 subrotunda. Long. 4 ; lat. *3 unc. 



Common at Little Tisti ; rare, and only as a cast near Takli. This 

 shell is very difficult of determination. Some have considered it a 

 Cyclostoma ; others have preferred the allied genus Leptopoma ; but, 

 in my opinion, it occurs too frequently, and that over a large area, to 

 belong to any family of land shells. Its sculpture, consisting of nu- 

 merous spiral keels or ribs with intermediate vertical striation, is very 

 k e the ornamentation of Paludina costata of Quoy ; but, at the same 



