14 Records of the Indian Musewn. [Vol,. XXIV, 



authors as being only forms, variations or phases of this highly 

 plastic species. A few further remarks are necessary in view of 

 the material now collected from the Tal Lakes. 



Large series of specimens collected in Naini Tal, Sariya Tal, 

 Khurpa Tal and Malwa Tal are like the typical L. patula Troschel 

 figured by von Martens. Some of the shells from Naini Tal are 

 referrable to the form amygdalum Troschel, while quite a large 

 series of specimens are intermediate between the two forms. In 

 view of these facts our conclusions as to the desirability of sup- 

 pressing txiese names seem to be justified. We were, however, in 

 doubt as to tV e form chlamys Benson. With a large series of speci- 

 mens from a"marshy area near Bhim Tal and from Naukuchia Tal, 

 I believe this to be a well marked phase. Its elongate shape 

 with a subcylindrical body- whorl, the comparatively short spire, 

 rather narrow and elongate mouth with a nearly straight outer 

 lip and the sulcate sculpture are quite characteristic of this phase. 



The form referred to as Sowerby' s^entricularius by Annan- 

 dale * and ventricularius Kuster in the paper cited above was 

 included on the authority of some Indian Museum specimens iden- 

 tified by Preston. The three shells, as I now find on comparison 

 with the large series of shells from Naini Tal, are all young speci- 

 mens of the form amygdalum Troschel and have nothing to do 

 with the species L. ventricularius Parreiss, from " Ostiudien." 



Limnaea luteola Lam. 



1920. Limnaea luteola, Annandale, Ind. Journ. Med. Res. VIII, p. 



109. 



This species, as was stated by Annandale in the paper cited 

 above, is identical with Deshayes' L. succinea, but as Lamarck's 

 name has priori ty, it should be known as L. luteola. It is not 

 very abundant in the Gangetic Valley, but is the common species 

 of Peninsular India. The occurrence of large numbers of speci- 

 mens in a muddy pool near Naukuchia Tal at an altitude of over 

 4000 ft. is, therefore, of special interest. In this pool the speci- 

 mens were found attached to the stems of Potamogeton and to a 

 grass which were growing abundantly in the muddy waters of the 

 pool. 



All the specimens are quite typical and are fully grown. 



Genus Gyraulus Agassiz. 



1919. Gyraulus, Annandale and Prashad, Rec. Ind. A/us. XVI II, p. 52. 



1921. Gyraulus. id. ,ib„ XXII, p 582. 



This genus is represented in the Tal Area by three species 

 G. convexiusculus (Hutton), G barrackporensis (Clessin) and what 

 appears to be an undescribed species. I do not, however, propose 

 to describe it till the collection of the Indian Museum Planorbidae, 



' Ind. Journ. Med. Res. VIII, p. uu (1920). 



