10 Records of the Indian Museum. [Vor. V, 
branches, and, especially in the older parts of the colony, anasto- 
mosis between branches, or even between two neighbouring colonies 
occasionally takes place. 
As regards the characters of the hydrotheca there is little to be 
added to Nutting’s description. If the expansion at the base of 
the polyp be taken as indicating the bottom of the hydrotheca, 
since no perisarcal structure marks the boundary between the 
hydrotheca and the common cavity, then about half of the hydro- 
theca is adnate to the branch, and about half free, at least on those 
portions where fascicling has not obscured the relations of parts. 
The operculum is, as Nutting surmised, similar in structure to that 
in the genus Stegopoma. 
The hydranths are large and fusiform, similar in shape to 
Hincks’s figures of those of Halecium halecinum (Hincks, 1868, 
pl. 42, fig..b). They are crowned by about eleven tentacles and 
are moored to the hydrotheca by strands of ccenosare projecting 
from a basal expansion. 
No gonosome was observed. 
Measurements. 
Hydrotheca, length adnate a = 0°50 min. 
- es LLCO ae as .. 0'49—0'56_,, 
a CHa TAGUC lie mene ae pee GODT 7 Ono 
Locatity: Malay Archipelago; depth 160 fathoms. Marine 
Survey collection. Reg. No. 8416/6. 
Distribution.—C. operculata has been recorded hitherto only 
from ‘‘ between the islands of Molokai and Maui, 138 fathoms,’’ 
Hawaiian Islands (Nutting). 
It is of interest to note that dwelling within the tubes of very 
many of the stems, even those in which the polyps are quite fresh, 
having apparently been alive when the specimen was obtained, are 
minute tentacled polychete worms. 
Sertularella polyzomas (IAnneeus), var. cornuta, Ritchie. 
CRISS ox 2-) 
Ritchie, J.: 1909 (2);"p. 525. 
From two localities come colonies which I record as a variety 
of S. polyzonias. Their habit differs considerably from the lax 
growths of var. gracilis, Kirchenpauer, which occur on the coasts of 
Britain, for the stem is thicker and more definite, and the branches 
alternate more regularly. There is nothing however to distinguish 
the minute characters of the hydrothece from those of some of the 
many forms of S. polyzonias, their shape approaching most closely, 
perhaps, that figured by Hartlaub (1900, Taf. v, fig. 5) from Juan 
Fernandez. On the whole, the facies of the tromhosome approaches 
