1915J Fauna of the Chilka Lake : Coelenterates. 111 



there is another narrower and less prominent one of the same nature. In the 

 living animal the two bands can hardly be distinguished. 



The endodermal parts are colourless. The manubrium is a stout conical body 

 much shorter than the bell. Its walls are very solid and I can detect no orifice. 

 There is, however, a relatively large lumen at the proximal end. 



The radial canals are simple and slender. 



Types.— Hydroid, No. Z.E.V. 2424/7 : Medusa, No. Z.B.V. 2436/7, Ind. Mus. 



This species is closely allied to those that form the genus Syncoryne (Ehrenberg) 

 as restricted by Allman, but the hydranth is distinguished from their hydranths by 

 the arrangement of the tentacles. The medusa is distinguished from Sarsia, Lesson, 

 by its capitate tentacles and lack of ocelli. 



Distribution. — The hydroid, from which medusae were hatched in Calcutta, 

 was originally found in a small artificial pool of brackish water at Port Canning 

 in the Gangetic delta. In the Chilka Lake we found the hydroid, with developing 

 medusae, on two occasions in the main area, in Rambha Bay and near Pigeon 

 Island, in both cases on the surface. 



The type-specimens, which were taken in December, 1907, were growing on a 

 grass-stem in water of low salinity. Our examples from the Chilka Lake are on a 

 leaf of Halophila ovata and on the stem of an indeterminate water-plant. They were 

 collected in July, 19 13. The salinity of the water was not ascertained at the time, 

 but in July, 1914, the specific gravity in Rambha Bay was about 1015. The species 

 is evidently scarce in the lake, but is probably a permanent resident in the main 

 area. 



Family BOUGAINVILLUDAE. 

 Genus Bimeria, Wright. 

 1868. Garveia -f Bimeria , Hincks, Brit.Hydr. Zooph., pp. 101, 103. 

 1871. Garveia + Bimeria , Allman, Mon. Gymn. Hydr., pp. 249, 297. 

 1902. Bimeria, Torrey, Zool. Pub. Univ. California I, p. 20. 

 1905. Perigonimus (in part), Motz-Kossowska, Arch. Zool. expérim. (4) III, 



p. 71. 

 1905. Pruvotella , id., ibid., p. 77. 

 1907. Bimeria, Browne, Journ. Mar. Biol. Ass. Plymouth VIII, p. 19. 



Bimeria fluminalis, sp. nov. 

 (Plate ix, figs. 3, 3a.) 

 1907. Bimeria veslita, Annandale {nee Wright), Rec. Ind. Mus. I, p. 141, fig. 3. 

 I am acquainted with two phases of this species, a luxuriant bushy form and a 

 dwarfed one consisting of simple pinnate stems arising at intervals from an adherent 

 rhizome. 



In the latter phase the stems are never much more than 20 mm. high and 

 may be reduced to stalks less than a millemeter long and bearing only a terminal 



