MOLLUSCA.
By G. NEVILL, C.M.Z.S.,.
FIB6T ASSISTANT TO THE 8UPEBINTENDENT INDIAN MUSEUM.
CEPBALOPHOBA.
GASTEROPODA PULMONATA.
F am ily -HELICIDJE.
Genus T r o c h o m o r p h a , Alb.
T r o c h o m o r p h a p e r c o m p r e s s a , Blanf., Plate LXXX, fig. 7.
Helix (Sivella) percompressa, Blanf., Proc. Zool. Soc., 1869, p. 448; Nevill, Joum; As. Soc., Bengal,
vol. xlvi, pt. ii, 1877, p. 15.
The single type specimen in the Indian Museum, Calcutta, found at Bham6, on
the Pirst Expedition to Western Yunnan, remains unique.
Genus N a n i n a , Gray.
Sub-Genus B o t t j l a , Alb.
N a n i n a ( B o t u l a ) a r a t a , B l a n f .
Nanina (Botula) arata, Blanf., Proc. Zool. Soc., 1869, p. 448; Nevill, I. c., p. 15.
Helix arata, Blanf., Con. Indica, pi. lxxxii, figs. 8 & 9.
Very closely allied to N. cmceps, 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 Bhamd and Ponsee; the
specimens from the latter locality are rather smaller, and are the var. minor of
Blanford.