VilwoONe ot ie HY DROZOO NW OAIeP AN U- 
LENA .CEVYLONENSIS (BROWNE). 
By R. E. Luovp, M.B., D.Sc., Major, I.M.S., Professor of Biology, 
Medical College, Bengal, and N ANNANDALE, D.Sc., F.A.S.B., 
Superintendent, Indian Museum. 
I.—TuHE SyvsSTEMATIC POSITION AND SYNONYMY OF THE 
SPECIES. 
By N. ANNANDALE. 
The medusa of this species was described by Browne! in 1905 
under the name Irene ceylonensis, while the hydroid was discovered 
by myself? in 1906. Ina recent paper? I have referred the species 
to the genus Campanulina, van Beneden, and this attribution is 
fully borne out by a detailed examination since made of the living 
hydranth. 
Medusae that agree, so far as structure is concerned, in every 
respect with Browne’s figures and description of J. ceylonensis 
have made their appearance in great numbers in a canal of brack- 
ish water in Calcutta in July, 1915, the water having, at the place 
and time at which specimens were taken, a specific gravity of 
1'0085 (the reading corrected to a standard temperature of 15°C.), 
and no great difficulty has been experienced in rearing young 
colonies of hydroids in a bell jar. The development is rapid. 
Medusae were placed in the bell-jar, which was filled with water 
from the canal, on July 5th; on July 7th numerous planulae and 
single minute hydranths, many of which had attached themselves 
to the cast skins of Copepods, were found, with intervening 
stages; while two days later young colonies were observed with a 
single perfect hydranth and a short rhizome bearing at least two 
hydranth-buds. The buds had the capitate form of those of 
C. acuminata (Alder) as figured by Hincks.* The hydranth figured 
here was sketched from life on July roth, by Babu D. N. Bagchi; 
only the part exserted from the hydrothecais shown. The column 
was capable of great elongation, but the tentacles seemed to be 
less extensile than in the adult and the whole organism was less 
sensitive. 

1 In Herdman’s Rep. Ceylon Pearl Fish., 1V, p. 140, pl. iii, figs. 9-11 (1905). 
2 Rec. Ind. Mus., 1, p. 142, fig. 4 (1907). 
3 Mem. Ind. Mus., V, p. 105 (1915). 
4 Brit. Marine Hydroid Zoophytes, pl. xxxvii (1868). 
