MOLLUSC A. 



By G. NEVILL, C.M.Z.S., 



FIEST ASSISTANT TO THE SUPEEIKTEKDENT INDIAN MUSEUM. 



CEPHALOPHOEA. 

 GASTEROPODA PULMONATA. 



Family -HELICIBJ]!. 



Genus Thochomorpha, Alb. 

 Tkochomobpha percompebssa, Blanf., Plate LXXX, fig. 7. 



Heli.f [Sivella) perconnnessa, Blanf., Proc. Zool. Soc, 1869, p. 448 ; Nevill, Journ. As. Soc, Beii'^al 

 vol. xlvi, pt. ii, 1877, p. 15. 



The single type specimen in the Indian Museum, Calcutta, found at Bhamo, on 

 the Pirst Expedition to Western Yunnan, remains unique. 



Genus Nanina, Gray. 



Sub- Genus Eotttia, Alb. 



Nanina (Rotula) arata, Blanf. 



Nanina {Rotida) arata, Blanf., Proc. Zool. Soc, 1869, p. 448 ; Nevill, I. c, p. 15. 

 HeUx arata, Blanf., Con. Indica, pi. Ixxxii, figs. 8 & 9. 



Very closely allied to N. anceps, Gld., but may, I think, be fairly separated ; 

 the spire is considerably higher, and the base of the body-whorl more excavated 

 round the umbilicus ; the keel at the periphery is less acute and the epidermis 

 appears to be darker; the sculpture is precisely similar; the Indian Museum 

 possesses specimens of N. anceps from Tenasserim, and also from Moulmein. 

 Dr. Anderson found N. arata tolerably abundant at Bham6 and Ponsee ; the 

 specimens from the latter locality are rather smaller, and are the var. minor of 

 Blanford. 



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