Vol III, No. 2.] Notes on the Freshwater Fauna of India 91 



JS what I mean when T talk of the colony being under tension. 



In such cases the zooecia were elongated, slender, cylindrical and 

 •often sinuous, while their keels, probably owing to the necessity 



for strength, were well developed throughout; the degree of 

 f)igmentation varied somewhat, but was never great. In colonies 

 ^^rowing on comparatively broad leaves, however, the zooecia were 

 -stouter and shorter and were all more or less swollen at their 

 -distal extremity, the degree to which the keel was developed vary- 

 ing considerably even as regards different zooecia of the same 

 ■colony. A further difference in ^uch colonies could also be ob- 

 ^served in reference to their apparent age. In some of them no 

 ;^rowing or perfect statoblasts were present, and the valves of the 

 ^statoblast from which the colony had originated still adhered to 

 -it. In such colonies practically no pigment was present in the 

 zooecia, which were very little distorted and had the form of those 

 •of P. diffusa. In other colonies, growing under the same condi- 

 , tions, almost every polypide bore a considerable number of stato- 

 J>lasts. In such colonies the zooecia were pigmented at the base 



of thft frpp nrirfinn to fl, variable extent and often had a more or 



irm 



forms 



less ''clavif , - . ^ 



-'distorted. The proximal, adherent part of each zooecia was always 

 ■devoid of pigment and was often so distinct as to have almost the 



^appearance of a stolon. 



There was no difference between the statoblasts of 

 -which resembled P. elegans and of those which agreed 

 m^ani. In both, sessile statoblasts were present as well as free 

 ones. The latter were very little smaller than the former, but 

 their air cells occupied a considerable, although very variable, 

 porportion of their bulk; the margins of the sessile ones were 



efciculated and entire. 



greed ( 



Allman's figure (pi. viii, fig. 9) of that of P. elegam, having a 

 -circular or almost circular capsule but a moderately elongated 



outline as a whole. In others the capsule was distinctly oval and 

 -occupied a greater part of the statoblast. Such statoblasts were 



innate in side view. 



Plumatella punctata, Hancock. 



P. punctata, Kraepelin, p. 126, pi. iv, figs. 110, 115, 116 ; 



pi. V, figs. J24, 125; pi. vii, figs. 153, 154. 



During the present month (January 1907) 1 have found this 



very distinct species growing luxuriantly, together with P r^n* 

 :and P emarqinata, on the leaves and stems of water-plants in a 

 i;ank in the Calcutta Zoological Gardens. My speci.nens agree 



•with Kraepelin 's var. densa. The statoblasts are large and of 

 -the same author's "autumn form." The name of the s|)ecios is 

 ■derived from the spotted appearance of the colonies due to the 

 Hiark stomachs of the polypides seen through the transparent 

 -ecfcocyst. 



