142 Records of the Indian Museum. [Vor,, XVI, 



Type-specimen. — No. M 1 1397/2 in the register of the Zoo- 

 logical Survey' of India {Indian Museum). 



Locality. — Khandalla, Poona district, Bombay Presidency ; 

 altitude 2,500 ft., March, 1918. 



We have thought it convenient to give this form a varietal 

 name as the characters are constant in the series we have exam- 

 ined. We believe, however, that its peculiarities are due to the 

 unfavourable conditions in which the individuals were living. 

 They were found at the side of the railway line in a small ditch 

 not more than a couple of feet wide and three or four inches deep. 

 The bottom was muddy and there was a considerable but epheme- 

 ral vegetation of semi-aquatic plants. Some of the shells possess 

 a kind of varix (pi. iv, fig. i) across the middle of the body-whorl ; 

 this we believe to be probably due to a temporary cessation in shell- 

 production at a time when the water in the ditch had completely 



Fig. 3. — Genitalia of Linmaen acuminata var. nana. 

 Ac. G.^=acces.sory gland, Al. G.=albumen gland. H. G.=hermaphiodite 

 gland. P.=:prostate. P. S.^^pcnis-sheath. Sp.=^spermatheca. lL:=uterus. 



dried up, and the animal had buried itself deeply in the mud, as 

 molluscs of this genus do in periods of drought. The ditch was 

 situated within a few hundred yards of the ponds in which the 

 typical form of the species was found. 



Limnaca chlamys, Benson. 

 (Plate V, fig. 3). 



1836. Limnaea chlamys, Benson, 'Joiirn. As. Soc. Bengal, \', p. 744. 

 1876. Limnaea chlamys, Hanley and Theobald. Conc/i. hid., pi. Ixi.x, 

 figs. 5. 6. 



The radula and genitalia of this form seem to us sufficiently 

 different from those of L. acuminata to justify specific separation. 

 The shell may be distinguished by the obliquity of the bod^'-whorl 

 and by the peculiar curvature of the outer margin of the aperture. 



The measurements of a specimen are as follows : — 



