1912.] F. H. GRAvELY & S. P. AGHARKAR: Limmocnida indica, 403 
of the production of special resting eggs. “The completeness of the 
disappearance of all medusae from the pool at Medha when this 
became muddy, and the absence of medusae from all pools be- 
tween May of one year and February of the next! also seem to 
point to the same conclusion. Moreover the occurrence of the 
medusa year after year in certain pools and its absence from others 
seems probable from what we saw, though by no means certain; 
and the organism must by now have had ample time to establish 
itself in every pool suited to its requirements. As far as one can 
see from above there is no difference between the various pools of 
the Koyna which can account for the occurrence of the medusa in 
one and not in all of them, so we are driven to suppose this differ- 
ence to exist in the bottom—a point, unfortunately, which could 
only be settled by a survey such as our equipment did not permit 
us to carry out. ‘The character of the pool at Medha seems to indi- 
cate that the hydroid must live on solid rock; and as the medusae 
always came up from deep water and no hydroid could be found 
near the edge it is probable that the hydroid lives only at a dis- 
tance from the surface. 
We therefore conclude that in the life-cycle of Limnocnida 
indica there is probably an asexual hydroid stage which lives 
attached to rocks? at the bottom of deep pools, and that this 
hydroid produces medusae by budding from February till April or 
May, when it ceases to do so whether the pool in which it lives is 
flooded or not, and very possibly dies. It is perhaps noteworthy 
that the long duration of this supposed fixed asexual generation 
corresponds to that of the free asexual medusae found in Tangan- 
yika, while the duration of the free medusoid generation of which 
only sexual individuals are yet known corresponds to that of the 
sexual generation of Tanganyika and occurs only a little earlier in 
the year, this difference of season being necessitated by the sum- 
mer rains of India. It is still possible, however, that asexual 
medusae may be found in India earlier in the medusa season ; and 
our knowledge of the times at which the Tanganyika form repro- 
duces in different ways rests on very few observations® and may 
prove to be misleading. 
1 All the inhabitants of the district seem to be agreed on this point. 
2 These pools contain no water-weeds. 
8 For a summary of these see Giinther, P.Z.S. II, 1907, p. 644. 
a I Ng ge 
