Polyzoa Entoprocta and Ctenostoniata. 
Alcyonidium mytili, Dalyell. 
(PI. I, fig. 2.) 
1848. Alcynnidium mytili, Dalyell, Rare and Remark. Anim. Scotland II, p. 36, pi. xi, figs. 1-4. 
1906. Alcyonidium mytili, vSilbermaii, Arch. f. Natiirg., Jahr. 72, I, p. 265, pis. xix, xx. 
1915. Alcyonidium mytili, Aniiaudale, Mem. Ind. Mus. V, p. 127. 
1915. Alcyonidium polyoum, Harmer, op. cit., p. 37, pi. iii, fig. i. 
Harmer says, on the synonymy of this species: " It is probable that Sarcochi- 
tum polyoum, Hassall, 1841, is the form assumed by old colonies of A. mytili " 
But mere probabiHty (which in this case is by no means strengthened by an examina- 
tion of Indian specimens) is a poor excuse for discarding well-known specific names 
in favour of others much less well known. 
I did not tak2 A. mytili on my recent tour, but as I have fairly abundant mate- 
rial from India it will be well to give in this paper a description of Oriental specimens 
from brackish water. 
My specimens are on the shells of Gastropod molluscs {Purpura or Thais carini- 
fera and Putamides fluviatilis) from the Chilka Lake and on the skin of a sea-snake 
{Enhydrina valakadieii) from the estuary of the R Hughli. In both cases the colony 
is extremely thin and transparent and when living was barely visible to the naked 
eye. In our survey of the Chilka Lake we saw no thickened examples, though we 
found the extremely inconspicuous films of the typical A. mytili not uncommonly. 
On shells the outlines of the colonies are obscured by the irregularity of the surface 
of attachment, but on the sea snake, to which a large number of colonies were 
attached, they were almost exactly circular. None were more than 2 cm. in diameter. 
It is probable, however, that these latter colonies were young. The zooecia and poly- 
pides agree with Harmer' s figure, except that, at any rate in the central part of the 
colony, the zooecia are much more variable in size and shape, some being very much 
smaller than others. I figure a single polypide (pi. i, fig. 2) for comparison with that 
of other species discussed in this paper. 
In living specimens from the Chilka Lake I found the number of tentacles to be 
12 or 14, but in polypides dissected out from a colony from the Gangetic delta it is 
certainly 16, as Silberman found to be the case in European specimens. 
Division STOLON IFERA. 
Family TRITICELLIDAE. ' 
Genus Triticella, Dalyell. 
1915. Triticella, Harmer, op. cit., p. 90. 
Harmer may be consulted for other references. Several, if not all, of the species 
are probably cosmopolitan, but only two records from Indo-Pacinc seas have hitherto 
been published, viz. Harmer's {loc. cit.) of T. boeckii, Sars from Algoa Bay and my own 
of T. korenii, Sars from Japan {Rec. Ind. Mus. VII, p. 124). 
