MOLLUSCA OF INDIA. 277 



2. EurycJiIamys, with 2 species, 3 with todarum since added. 



E. platycldamys type, regulata. 



3. Austenia, with 11 species. 



A. giyas type, biitleri, resplendeiis, venusta, magniflca, naya- 

 ensis, cacharica, soUda, peguensis, sJianensis, sikkimensis. 



4. Girasia, with 9 species. 



0. liooTceri type, radha^ crocea, jif^'^^kahariensis, dalhousice, 

 burtii, ? cinerea, affinis, ? dikrangensis. 



5. Cryptogirasia, a single species. 



0. rubra type.* 



6. Mariixlla, 2 species. 



M. dussumien type, and beddomei. 



7. Pseudaustenia, 2 species. 



P. atra type, and auriformis. 



8. Cryptosoma, 3 species. 



C. prcestans type, inusitatittn, birmaniciim [/ aiisteni^. 



Genus Cryptaustenia. 



Cryptaustenim, Cockerell, section of Austenia, " Notes on 

 Shigs," A. M. N. H. (6) vii. 1891, p. 99 (no description, type 

 A. plunospira, Bs. : as a section of Helicarion); id. Nautilus, xii. 

 1898, p. 10. 



Faun. Brit. Ind., Moll. (1908), p. 180. 



Type, succinea, l^eye=pla.nospira, Bs. 



" Shell imperforate, thin, diaphanous, smooth, depressed ; whorls 

 3-4|, rapidly increasing, the last large and rounded ; aperture 

 large, oblique; peristome simple, more or less membranaceous. 



" The animal has the shell-lobes of the mantle broad but divided 

 from each other and almost or quite concealing the shell when 

 fully expanded. Peripodial groove and mucous pore strongly 

 developed, a projecting lobe above the latter. Genitalia chiejly 

 distinguished from Macrochlamys by the absence of a coil for (more 

 correctly near) the attachment of the retractor mxiscle of the penis. 

 Eadula with a tricuspid rhachidian tooth and rather numerous 

 broad inner laterals bi- or tricuspid, together with a much smaller 

 number of outer pointed bicuspid laterals than in typical Girasia, 

 and the outer cusp of these is outside remote from the end. 



" This group is at once distinguished by its shell from Girasia 

 and Austenia. It chiefly differs from Vitrina by having a mucous 

 pore, and the genitalia are quite different." 



Cryptatjstenia bensoni, Pfr., vide Austenia bensoni, Pfr. 



Continued from Vol, I. p. 150: Plate XXXVI. fig. 6, animal, 

 figs. 7, 7 a, 76, shell ; Plate XXXVIII. fig. 2, radula. Calcutta 

 specimen. 



* The generic relations of the animal are doubtful, it has a rudimentary 

 small oval shell, but the internal anatomy has yet to be investigated. I found 

 it close under the village of Kohiina in the Naga Hills, under stones and 

 decaying logs on the north side of tlie hill. Anyone finding and preserving 

 this animal will be doing a great service to Indian Malacology. 



