Vol. II, No. 4.] + Notes on the Freshwater Fauna of India. 109° 
[N.S.] | 
17. Notes on the Freshwater Fauna of India, No. IV.— dr 
orientalis and its bionomical relations with other Inverte- 
brates.—By N, Annanvatz, D.Sc., C.M.Z.S. 
as the body. The gonads only occur on the upper two-thirds of 
the body. The sexes are distinct. The normal egg is subspheri- 
cal and is set with slender spines which are bifid or expanded at 
the tip, being more numerous and relatively finer than those cn 
_the egg of H. grisea. Eggs without a thickened external shell 
_are produced under certain conditions. 
KX ct 
hope to publish elsewhere a more detailed account of the 
“Although symbiotic algae do not occur in the tissues of Hydra 
‘orientalis I have found, on several occasions, groups 0 minute 
‘organisms, evidently belonging to the same order of plants as 
"those which live in other species, attached to the surface of the 
; 
ted into the tissues by some wound or aperture, only becoming 
symbiotic in the true sense of the word by gradual adaptation, 
° . . n 
mment. 
Of animals living in more or less intimate relations with the 
Polyp, I have found two very distinct. species of Protozoa, neither 
1 See the Journal of this Society for 1905, p. 72. 
2 Proc, Roy. Soc. B. LX XVII, 1905, p. 66. 
