too DR. NELSON ANNANDALE ON THE 



from the skin of a snake. The coiiinion tropical acorn-baniacle Balamis 

 ampldtrUe often covers the surface of fishing-stakes off Koh Yaw witli 

 its shells, but is liable to be killed by floods of fresh water. 



Fohjzoa. The Polj'zoa of the outer lake are not unlike those 

 found in similar situations in the Bay of Bengal. The most interest- 

 ing species is perhaps an undescribed Entoproctons form, representing 

 a new genus but allied to the Indian brackish water Loxosomatoides, 

 and more remotelj' to the North American freshwater Urnaiella. The 

 Ectoproctous species belong to the genera Memhranipora, Triticella, 

 Boiverbanliia and Vicforella, and (with the exception of the Triiicella) 

 are identical with Indian forms. The Triticella, which was found on 

 the tail of a sea-snake and on the shell of Lirimlus, is interesting in that 

 it is a British species ( T. r/edicillata ) not previously found in 

 Eastern waters, in which the genus is very scarce. 



" Worms ". Lanchester l has described a small Echiuroid worm 

 from the inner part of the connecting channels under the name Thalas- 

 aenia sahiimm. I found a specimen exactly answering to his description 

 in the outer channel opposite Singgora, but it differs great!}' from the 

 specimens preserved in the Cambridge Museum as the types of the 

 species, and some confusion must have occurred. 



Several Polychaete worms live in the mud of the outer channel, 

 and one makes itself conspicuous by the relatively enormous size and 

 the exposed situation of its egg-masses. These are encased in trans- 

 parent pear-shaped bodies, which are anchored by a basal tube ( which 

 represents the stalk) and float like balloons in mid-water at the edge 

 of the lake, and in ditches connected with it. This worm certainly 

 belongs to the family Eunicidae and probably to the genus or subgenus 

 Marphijsa. The small white calcareous tubes of a Sorpulid may be seesi 

 in large numbers on logs of wood and other bodies subnierge(i in the 

 outer lake. Similar worms are couinidn in some of the Indian back- 

 waters, but seem to b:; entirely absent from the Chilka fjake. 



Sea Anemones, Medusae and Hi/dA-oids. At least three kinds of 

 sea-anemone are found in the outer channel of the lake, but they 

 are all small and inconspicuously coloured. One speciea, which is 



1. Id., ibid., 1905 (I;, p. 40, 1.1. ii, fi-. 5. 



JOURN. NAT. HI.ST. SOC. SIAM. 



