FAUNA OP A MADRAS POND AND ITS VARIATIONS. 25 
only prevented my seeing tliem earlier. Parthenogenesis 
appeared to be always takiug place but I noted ?exual re- 
production in any of tlie forms during May to November 
only. 
The Ostracods and the Copepods thrive throughout the 
year. 
Arachnida. — I have found three forms of fresh-water 
Acarinae in the pond. 
Hexapoda. — Numerous insect larvEe and insects occur 
in the pond throughout the year and are most abundant 
during the rainy season. 
MoLLUSCA. — Gastropoda^ AmpuUaria ; Planorh'is ; Lim- 
nceus. 
These three gastropod genera are all represented but I 
found no Lamellibranch. 
PoFiYZOA. — I came across a few leaves with an old I'oly- 
zoan skeleton upon them but could find no living specimens. 
• Vektebeata. — Little fresh-water fishes and Batrachian 
larvae were obtained in large numbers duringf the rainy 
season. It will thus be seen that of the various fresh-water 
groups the only important ones which are entirely absent 
are the Coelenterata, Am.phipoda, Isopoda and Decapoda. 
Resume and Calendar. 
The following organisms were present throughout the 
year, some of them appearing at one time in large numbers 
and diminishing at other times but never altogether absent : 
— Infusoria, M esostomum, Dero, Clepsine, Cladocera, Ostra- 
coda, Copepoda, Rotifera, Limnceus, Planorhis, Amjmllaria, 
insects and insect larvee. 
January, — Temperature: Max. 89°— Min. 62°; Weather: 
fine. 
