t^^l

96 YALTATlDifi.—P1LID.E.
througliouu Europe, Siberia, and Asia Minor, is taken from Eeeve's
" Land and Freshwater Molkisks indigenous to the
British Isles " :—
Shell: somewhat globosely heliciform, deeply narrowly um-bilicated,
pale straw-colour, semitransparent but solid; whorls
four and a half to five, depressed at the apex, longitudinally
densely finely striated, spirally faintly ridged, ridges sometimes
obsolete ; aperture somewhat pyriformly rounded.
" Valvata piscinalis is almost milk-white, showing its bright
blue-black eyes very conspicuously on the inner base of each
tentacle."
It is recorded from Kashmir.
187. Valvata, (?) microscopica, Q. Nevill.
Vahata (?) tnicroscopicii, G. Nevill, Cat. MolI.,-Fasc. E, 1877, Si
Hand List, pt. 2, p. 17.
Original description :—Shell exceedingly minute, orbicular,
moderately thin, depressed, and diseoidal; whorls four, moderate,
convex, with distinct suture, the last whorl increasing rapidly ;
the shell, both above and below, rugosely and distinctly s[«rally
striated, deeply urabilicated, with rounded and proportionately
rather large aperture : the specimens were coated with soine thick
black deposit; when cleaned the shell presents a brownish-red
appearance ; the operculum examined under the microscope is
horny and circular, of comparatively rather thick substance ; it
appears to be multispiral, but we were not able to make out tlvw
structure quite satisfactorily.
Diara. 1"5 mm.
Hab. Port Canning, in brackish water.
Family PILID^E [^=:Ampullariida;\
Subfamily PILlN^^l.
Shell globose, large, holostome, with calcareous operculum.
Genus PILA-
Pita, Bolten, Mtls. Bolten. 1798.
Amputlaria, Lamarck, M^m. Soc. Hist. Kat. Paris, 1799, p. 76.
TrpE, Helix ampuUacea, Linn.; MaLaysia,
Range. S.E. Asia; C. Africa.
Shell turbinate, globose, with little exserted spire; aperture
oblong, oval; labrum arched, simple, occasionally reflexed j
operculum calcareous.