6q2 Memoirs of the Indian Museum. [Voi. V 



Halianthus limnicola. — No sea-anemones were dredged in the rainy season of 

 1919, but several specimens of this species were obtained in April, 1920. They were 

 much less active and not so contractile as those observed in the cold weather of 

 1914. 



Acromitus rabanchatu. — This medusa was common in the bay in December, 1919, 

 but none were observed in April or the early part of June, 1920. In the latter half 

 of June young and half-grown individuals were common, including specimens in the 

 Semostoman stage. 



Dicyclocoryne filamentata. — A young medusa was taken on the surface of the bay 

 in August, 1919, by Major Sewell and Dr. Baini Prashad. It is about twice the 

 size of those previously described, which were killed when just set free in an aquari- 

 um, and agrees with them in all but two important characters. These two charac- 

 ters are (1) that an eye-spot is well developed in the sensory mass at the base of each 

 tentacle, and (2) that each tentacle bears, about half-way along its length, a pair of 

 lateral branches precisely like itself. It is, therefore, probable that the adult medusa 

 of this species has branched ambulatory tentacles and resembles Cladonema. Less 

 important differences from the original specimens observed are that the manu* 

 brium is narrowly bell-shaped and situated on a short peduncle, the mouth being 

 now open in the form of a small pore, and that the umbrella expands a little 

 towards the base. The subquadrate cross-section and minutely tuberculate surface 

 are preserved. There is still no trace of the gonads. The medusa of this species 

 had not been hitherto observed in the Chilka Lake, or indeed, anywhere in natural 

 conditions, the youngest stage having been described from captive specimens. 



Bimeria ßuminalis. — The dwarfed form of this species was common on the lower 

 side of stones near the edge of the lake with the sponge Laxosuberites lacustris as 

 late as December, 1919, but I was not able to find any specimens in the early part 

 of June, 1920. By the end of that month, however, very small colonies were abun- 

 dant on the lower side of stones on the landing-stage on Barkuda. The species is 

 able to live for short periods in fresh water, but apparently not permanently. 



Ctenophora. 



The only member of this group that occurs in the bay is Pleurobrachia globosa 

 bengalensis, which, however, in 1914 was found only when the water was fairly salt. 

 It was not found in December or April, 1919, but was common at the end of June 

 with Phialidium cruciferum and the young of Acromitus rabanchatu. 



POI.YZOA. 



The only Polyzoon I saw in the lake in 1919-20 was Membranipora hippopus 

 Levinsen. Loxosomatoides laevis, which was common on stones at Barkuda in 1914, 

 was not found. Small colonies of the Membranipora were common on Potamogeton 

 pectinatus as late as December, 1919, but I could find none in April, 1920. At the 

 end of June in the latter year it was fairly common on Potamogeton. 



