(1) Bimeria vestita, Wright (1859).
Hincks, Hist. Brit. Hydr. Zooph. p. 103, pl. xv, fig. 2 (1868); Annandale, Rec. Ind. Mus. i, p. 141, fig. 3 (1907).
This is a European species which has also been found off S. America. It occurs not uncommonly in the creeks that penetrate into the Ganges delta and has been found in pools of brackish water at Port Canning. The Indian form is perhaps sufficiently distinct to be regarded as a subspecies. The medusoid generation is suppressed in this genus.
(2) Syncoryne filamentata, Annandale (1907).
Annandale, Rec. Ind. Mus. i, p. 139, figs. 1, 2 (1907).
Both hydroid and medusæ were found in a small pool of brackish water at Port Canning. The specific name refers to the fact that the ends of the rhizomes from which the polyps arise are frequently free and elongate, for the young polyp at the tip apparently takes some time to assume its adult form.
(3) Irene ceylonensis, Browne (1905).
Browne, in Herdman's Report on the Pearl Fisheries of Ceylon, iv, p. 140, pl. iii, figs. 9-11 (1905); Annandale, Rec. Ind. Mus. i, p. 142, fig. 4 (1907).
The medusa was originally taken off the coast of Ceylon, while the hydroid was discovered in ponds of brackish water at Port Canning. It is almost microscopic in size.
The first two of these species belong to the order Gymnoblastea (Anthomedusæ) and the third to the Calyptoblastea (Leptomedusæ).