ig22.] B. Prashad : Knmaon Lakes. 13 



Sukha Tal. 



In May, 191 1, this area was found to be quite dry, but a few 

 Cladocera and Ostraeoda were reared out of some earth brought 

 back to Calcutta. In September, 1920, practically the whole of 

 this area had 2 or 3 feet of water. The vegetation was very 

 scanty, consisting only of a few stray plants of Potamogeton, but 

 algae like Hydrodictyon and Spirogyra were very abundant. 



A fair number of Cladocera and Ostraeoda were collected and 

 water-bugs were plentiful near the margins. Larvae of dragon- 

 flies of the species Anax parthenope Selys, Lestes cyanea Selys and 

 Orthetrum triangulare Selys were fairly abundant. No Limnaea 

 was seen, but Planorbids of the genus Gyraulus were common 

 amongst the algal filaments. 



Damianti Tax. 



Situated at about the same level as the Sat Tal, but about a 

 mile to the east of it, is a spring known as the Damianti Tal. 

 A small stream, which has been greatly widened and deepened 

 for irrigation purposes, leads down from the spring to the 

 valley below. At the time of our visit both the spring and the 

 mouth of the stream were full of cow-dung with many submerged 

 grasses growing in them. 



The only interesting animals collected here were a few 

 Limnaeae, a few Gyraulus and some bivalves of the common Indian 

 species, Sphaerium indicum. 



The hill-streams were very uninteresting from the molluscan 

 point of view. In the upper regions, where they are fairly rapid, 

 no molluscs were found, but lower down they had a few Mollusca 

 of the families Melaniidae, Planorbidae and Hydrobiidae. As 

 these Molluscs were collected outside the limits of the Tal area and 

 as they belong to common Gangetic species, I do not propose to 

 include them in the present paper. 



Family UMNAEIDAE. 



Genus Limnaea Lamarck. 



Two species of this genus, L. acuminata and L. luteola, were 

 collected in the Tal area. The former is the common species and 

 is represented by a number of forms or phases, while the latter 

 has a much restricted distribution and was found only once in a 

 pOnd on the roadside near Naukuchia Tal. 



Limnaea acuminata Lain. 



188 1 . Limnaea acuminata, von Martens, Conch. Mitth. I, p. 75, pi. xiv. 

 1921. Limnaea acuminata, Annandale and Prashad, Rec. Ind. Mils. 

 XXII, p. 568. pi. vii, figs. 1-3, text-fig. 12. 



In the paper cited above Dr. Annandale and I have given 

 reasons for considering most of the Indian species of the older 



