24 FAUNA OF A AIADEAS POND AND ITS VARIATIONS. 
period during" the year. The diminution in numbers of 
these formSj during the hottest months is easily accounted 
for as they live for the most part in shallow water, i.e., near 
the margin so that as the pond dries, as they cannot rapidly 
shift their locale, they perish. 
HiRUDiNEA. — Clepsirie. Three or four species of Clepsine 
are to be found in the pond throughout the year but they 
become most numerous from August — November. 
RoTiFERA. — Two or three common species of Eotifera 
flourished in the pond throughout the year and I observed 
them in unusually large numbers about tiie end of April. 
Crustacea. — Branchiopoda, 1 sj*. 
Cladocera. — Daphnia reticulata; Moina fischeri, E. J. 
Beck; Microthryx 7-osea ; Isp.iJ. 
Ostracoda, Gypris ; Cythere. 
Copepoda, Cyclops. 
I have been unable to find any record of the occurrence 
of freshwater Branchiopoda in this Presidency. Last year 
Dr. J. R. Henderson showed me some specimens of a 
Branchiopod which he found teeming in a pool on the 
Shevaroy Hills. My species is undoubtedly different from 
this and 1 hope to describe it in detail on another occasion. 
This Branchiopod appeared suddenly in large numbers in 
our pond during the latter part of August and remained 
throughout September and was to be found not only in 
this pond but in mauy others in Madras. 
For the identification of the species of Cladocera I am 
indebted to Miss. Beck to whom Dr. Bourne sent specimens. 
I first saw Daphnia reticulata in January^ Moina Fisclieri 
in February, Microthrix roi'eu in April and the fourth 
species in November but as they were to be found in all 
subsequent " takes it is possible that want of knowledge 
