s ; a. 
672 General Notes. [July 
jority of the fresh-water basins up to two thousand metres har- 
bor a pelagic fauna very rich in individuals. Some of the lakes 
at higher elevations are also well supplied. From seven to six- 
teen species appear usually in each lake up to seventeen hundred 
and ninety-six metres, The most widely and generally distrib- 
uted genera are Daphnia, Cyclops, and Diaptomus. 
_ Tropidonotus clarkii B. G., in Southern Louisiana.—Early 
in June, 1886, the writer had occasion to collect on the salt 
marshes at Grand Isle, Louisiana. This island is on the Gulf 
coast at the entrance of Barataria Bay, about forty miles west of 
the mouth of the Mississippi. Here Clark’s water-snake (Tropi 
donotus clarkii) was not uncommon, as several were seen daily, 
and one or two were secured for identification.—A. K. Fisher, 
M.D., Washington, D. C., June 7, 1887. 
Spelerpes bilineatus, Spelerpes ruber, Plethadon erythronotus, and 
hus fusca—A. K. Fisher, M.D., Washington, D. bn 
pecially interesting when taken in connection with the presence 
of such birds as the Large-billed Water-thrush (Seiurus motacilla) 
F t 
ern species in this locality is €% 
shells , 
s the least, though the flesh had evidently 
