igig.\ N. Annandale . Bombay Stycams Fauna 145 



The radular teeth (fig. 4, pi. V) are coarser in this species 

 than in the other two we have discussed. The central tooth is 

 small, often distinctly asymmetrical and with either two or three 

 lobes. The lateral teeth have three distinct cusps, but the inner- 

 most is strongly curved and bends outwards towards or even 

 beneath the median cusp ' in a very characteristic fashion ; the 

 central cusp is much larger than the outer one. There are only 

 about six rows of lateral teeth. The marginal teeth have a con- 

 siderable number of cusps the outermost of which is much coarser 

 and nearer to the base than the others, especially towards the 

 edge of the radula. 



The middle piece of the horny upper jaw is broad and coarse 

 and of a dark brown colour; the cutting edge is nearly straight. 



In this species the genitalia (fig. 5) closely resemble those of 

 L. chlamys, but all the ducts are shorter and the distal part of the 

 male duct is hardl}^ longer than the proximal pare. The sperraa- 

 thecal duct, although distinctly present^ is much shorter than the 

 spermatheca. 



Genus Planorbis, Geoifro}'^ 



The Indian species of this genus are still very imperfectly 

 known The large collection of shells belonging to the Indian 

 Museum has recently been examined by M. L. Germain of the Paris 

 Museum but the transmission of the manuscript of his report upon 

 it has been delayed by the war. 



Planorbis cxustus, Desh. 



191S. Planorbis exzisfus, Annandale, Rec. hid. Mus. XIV, p. ni, pi. 

 xi, figs. I, la. 



This is certainly the most abundant species as well as the largest 

 commonly found in the plains of India, It is, however, scarcer 

 as a rule in hilly country. A young specimen was obtained in the 

 ponds at Khandalla. 



Planorbis labiatus, Benson. 



^gI5. Planorbis (Gyraiihis) labiatus, Preston, FaiDi. Brit. Ind. Freshw. 

 Moll., p. iiy, fijj. 5. 



A specimen from the ponds at Khandalla agrees well with 

 Preston's figures of the type-specimen. 



Family Melaniidae. 



Genus Melania, Lamarck. 



Two species of this genus were found in abundance at the 

 edge of the Yenna River at Medha, and at other places in the 



The innermost cusp is much larger and more distinct irom the median cusp 

 in a specimen from Madras (presented by the late Prof. Gwatkin) than in the one 

 we have figured. Its outward curvaturf: is, however, iust as strongly marked and 

 characteristic. 



