1922.] B. Prashad : Kamaon Lakes. 15 



now with Monsieur h. Germain of the Paris Museum, is returned 

 to India. 



Gyraulus convexiusculus (Hutton). 



192 1. Gyraulus convexiusculus, Annandale and Prashad, op. cit., p. 582 . 



Large numbers of specimens of this species were collected in 

 Naini Tal, Sariya Tal and a hill-stream opening into the north- 

 western corner of Bhim Tal, attached to the stems of Potamogeton 

 and entangled in the filaments of algae like Spirogyra. 



Gyraulus barrackporensis (Clessin). 



1886. Planorbis Barrackporensis, Clessin, Limnaeiden Mart. Chemn. 



Conch. Cab., p. 125, pi. xviii, fig. 7. 

 1886. Planorbis Huttoni, id., ib., p. 139, pi. xviii, fig. 4. 

 1909. Planorbis barrackporensis, Germain, Rec. Ind. Mus. Ill, p. 120. 

 1915. Planorbis (G.) barrackporensis and P. (G.) huttoni, Preston, 



Faun. Brit. r 'id. Freshw.-Moll. pp. 121, 120. 



I agree with Gerrm a in considering P. barrackporensis and 

 P. huttoni as being the sa.me species. The species is known to occur 

 in such widely separated localities as Barrackpore, Calcutta, Benares 

 and Tibet. 



In the Tal area we collected specimens of this species in 

 Naukuchia Tal along with those of Hippeutis caenosus (Benson). 



Genus Hippeutis Agassiz 



192 1. '! Hippeutis, Annandale and Prashad, op. cit., p. 584. 



In the paper cited above Dr. Annandale and I recently sug- 

 gested that Benson's Planorbis caenosus, which had hitherto been 

 assigned to the genus or sub-genus Segmentina, agrees with his 

 other species P. umbilicalis in shell-characters and is probably 

 congeneric with it. We further questioned their being included 

 in the genus Segmentina and suggested that they should probably 

 be placed in the genus Hippeutis. An examination of the soft 

 parts and radula of the European H. fontanus confirms this 

 opinion. 



Hippeutis caenosus (Benson). 



1850. Planorbis caenosus, Benson, Ann. Mag. Nat. Hist. (2) V, p. 



349- 

 1876. Planorbis caenosus, Hanley and Theobald, Conch. Ind. pp. xviii 



and 18, pi. xxxix, figs. 7-9. 

 1878. Planorbis caenosus, Sowerby, Conch, Icon. XX, pi. x, figs. 78, 



a, b. 

 1878. Planorbis caenosus, Nevill, Hand List Moll. Ind. Mus, I, p. 



246. 

 1886. Planorbis caenosus, Clessin, pp. cit., p. 165, pi. xxiv, fig. 4. 

 1915. Planorbis {Segmentina) caenosus, Preston, op. cit., p. 127. 

 1918. Planorbis caenosus, Annandale, Rec. Ind. Mus. XIV, p. 113. 



This species has been recorded from Jamalpur, Bengal; Man- 

 bhum, Orissa; Bhim Tal, United Provinces; and Yawnghwe Pro- 

 vince. Burma. A fair series of specimens was collected by us in 



