572 Records of the Indian Museum. [Vol. XXII, 



Limnaea ovalis, Gray. 



1878. Ltmnaeiis ovalis, Nevill, op. cit., p. 233. 



1881. Limnaea ovalis, von Martens, op. cit., p. 81, pi. xv, figs. 1-4, 

 8,9. 



This species is much less variable Init more sporadic in occur- 

 rence than L. acuminata. One adult and two young specimens 

 were found at Chigi Turel on the Chugnu Road in Manipur by Mr. 

 Sunder Lai Hora in a small shallow channel of water. The adult 

 specimen is not quite typical but may be described as intermediate 

 between those figured as var. ■prunurn and var. micleus by von 

 Martens in the paper cited. It is, however, smaller than either, its 

 height being ig'S mm. and its maximum diameter I2'i mm. It is 

 of a dull opaque purplish brown colour and rather thick. 



L. ovalis has been found at various localities in the Ganges 

 Valley and also at Golconda in Hyderabad (Annandale and Kemp). 

 It is often abundant where it occurs. It has been recorded, 

 doubtfully, from Assam and with less doubt from the lake coun- 

 try of Kumaon in the Western Himalayas, but not from Burma. 



Limnaea ovalior, sp. nov. 



(PI. VII, figs. 4—6.) 



The shell is of moderate size and thickness, of a very regular 

 and symmetrical oval shape, of a bright chestnut brown colour 

 and unusually opaque when quite fresh and clean. It is about i^ 

 times as high as broad. The spire is short and blunt, consisting 

 of 3-| or 4 whorls and never occupying more than about J of its 

 total height. The spiral of the first 2-J or 3 whorls is transverse, 

 but above the basal whorl of the spire it becomes oblique and 

 above the body-whorl still more so. The suture is impressed round 

 the terminal whorls of the spire, but much less so above the two last 

 whorls of the shell and the upper part of the whorls is not at all 

 shouldered or angulate. The whorls increase in breadth rapidly 

 and the basal whorl of the spire is nearly as broad as the upper 

 part of the body-whorl. The latter is very regular in outline and 

 dorsally is about i-^ times as long as broad ; its anterior extremity 

 is evenly rounded and very little expanded. The aperture is long 

 and rather narrow, extending for about tV the height of the shell ; it 

 has an auriculate outline, is sharply pointed above and very little 

 oblique. The outer lip is sharp and evenly arched. The umbili- 

 cus is completely occluded by the columellnr callus, which is 

 broad, coarse and high, extending to the outer lip above and at 

 its outer extremity covered over by it. The columella is short and 

 twisted and nearly straight as a whole. The sculpture consists of 

 fairly regular fine, slightly curved longitudinal ridges, some of 

 which, probably representing the growth periods, are coarser than 

 others. They are barely visible to the naked eye. The profile 

 of the external surface is moderate. 



