134 Records of the Indian Museum. [VoL. VII, 
Although there appears to be some evidence that these two 
forms are merely phases of one species, it is noteworthy that 
C. kumaonensc, to use the name without prejudice, is the common 
form in Bhim Tal at a time of year at which C. longicorne 
predominates in other lakes situated in the same district and at 
approxinately the same altitude. 
Sav TAL. 
This lake is situated about two miles west of Bhim Tal at 
a slightly greater elevation. Originally, as is implied by the name, 
seven lakes existed, but only two sheets of water of any consider- 
able size now remain. The larger, Sat Tal proper, is U-shaped 
and in former times comprised two separate lakes; but a neck 
of shallow water now connects the large eastern part with the 
smaller, but much deeper. western part. 
The fauna of Sat Tal is in some respects similar to that of 
Bhim Tal, but the plankton is poor and the Ceratium, found in such 
abundance in the latter lake, was (in May) almost entirely absent. 
Two species of sponge were found, Ephydatia fluviatilis and 
Spongilla cartert, the latter being very common. Of polyzoa, 
Lophopodella cartert was plentiful on the branches of trees growing 
in the eastern part of the lake and Fredericella indica was found in 
the same situation along with a few colonies of Plumatella 
tanganytkaec. The water bug Heleocoris, noticed in Naukuchia Tal, 
was not uncommon; but other aquatic insects were, as usual, 
extremely scarce. Small leeches similar to those obtained in Bhim 
Tal occurred under stones on the margin of the lake. 
The plankton was very scanty; a few copepods were found 
and Peridinium apiculatum was comparatively plentiful. The few 
examples of Ceratium that were obtained had the same form as 
those observed in Malwa Tal. 
In May a small pool of water existed at the bottom of a deep 
ravine situated close to the weir at the north-west corner of the 
lake. This, as was found to be the case with the ponds in the 
vicinity of Bhim Tal and Naukuchia Tal, sustained an abundance 
of insect and molluscan life. 
Gurud Tal, a small lake situated close to Sat Tal but at 
a slightly greater elevation, could not be examined systematt- 
cally owing to the absence of a boat. Judging, however, from an 
inspection of the bank, its fauna did not appear to differ in 
any notable way from that of the larger lake: 
NAINI TAL. 
This, the largest of the Kumaon lakes, is situated at an 
elevation of about 6,400 ft., nearly 2,000 ft. higher than Bhim 
Tal; but notwithstanding its greater altitude the fauna did 
not present any considerable difference from that found in the 
lower lakes, though, on the whole, it appeared to be less rich. 
