Hydrozoa and Ctenophora. 
Ill 
race, but its gonosome has not been examined. I have seen an imperfect specimen 
embedded in a colony of the Polyzoon Australella lendenfeldi^ (Ridley) from New 
South Wales 
Family BOUGAINVIUJIDAE. 
Genus Bimeria, Wright. 
Bimeria fluminalis, Annandale. 
1915. Bimeria fluminalis, Annandale, Mem. Ind. Mus. V, pp. iii, 112, fig. 10, pi. lix, 
figs. 3, 3fl. 
Fishing-stakes in the outer lake of the Tale Sap were covered with this hydroid 
in January, 1916. I also dredged a small stick similarly covered in the connecting 
channel between the outer and the inner lake. The speci- 
fic gravity of the water (corrected) varied from 1-0015 to 
1-004. 
Siamese specimens do not differ materially from Indian 
ones so far as the structure of the hyrdophyton and 
gonosomes are concerned, but the chitinous investment of 
the base of the tentacles is thinner and less easy to detect. 
I was led, therefore, to believe at first that those from the 
Tale Sap represented a species of Perigonimus and not the 
true B. fluminalis. In any case the separation between 
the two genera, if we regard Wrightia as synonymous with 
Perigonimus , is so slight, depending as it does upon this 
variable character of the investment of the liydranth, 
that it may have to be abandoned.' I leave the ques- 
tion to those who have a wider knowledge of the marine 
hydroids. 
B. fluminalis is only known from brackish and tempora- 
rily fresh water connected with the Bay of Bengal and the 
Gulf of Siam. 
Order CALYPTOBLASTEA. 
Family CAMPANULARIIDAE. 
Genus Campanularia, Lamarck. 
Campanularia serrulata, Bale. 
1889. Campanulana? scrritlata, Bale, Proc. Linn. Soc. N.S. Wales III (i), p. 757, pi. xii, 
fig- 4- 
I found a Campanulariid hydroid in the Tale Sap which on a superficial exam- 
ination I mistook for the species from the Chilka Lake that I recently identified as 
Clytia serrulata.' A closer scrutiny, however, revealed the fact that it was a true 
Campanularia, and yet that it agreed even more closely with Bale's original figure than 
Fig. I. — Bimeria fluminalis. 
Part of a colony from a 
fishing-.stake in the outer 
part of the Tale Sap. x 2. 
I Annandale, Rec. Ind. Mus. XI, p. 167 (1915). ^ Motz-Kossowska, of>. cit., pp. 69, 70 (1905). 
S Annandale, Mem. Ind. Mus. V, p. 106. pi. ix, figs, i, la, ib (1915). 
