Mr. H. J. Carter on the Freshwater Infusoria of Bombay. 35 



The only way in wliich this process can he well seen i.>, by 

 getting specimens of Kwjlcna viridis which are turning red, 

 tilled with ovules and about to become capsuled, or which have 

 been just burst from their capsules. These, which at this time are 

 spherical, if placed in water under a light piece of glass, and the 

 water partly abstracted by bibulous paper, will, by the pressure 

 of the glass, assume a compressed circular form, in the centre 

 of which the vesicula and its sinus may be observed in full 

 operation, and be deliberately watched for some time, or until 

 the infusorium dies (fig. 11). 



Besides Pohjtoma Uvella, and Chlamidomonas, as before men- 

 tioned {Joe. cit.), the vesicula has been seen and described by 

 Mr. G. Busk in Volvox Glohator"^, and having myself also seen 

 it in the Thecamonads, besides several species of Eufjlena, while 

 it would appear that Cohn has observed it in the swarm -cells of 

 Confervce, its existence throughout this class of Infusoria seems 

 thus to be established. 



At p. 128 it is stated respecting the vesicula — " in Eughjpha 

 I have not been able to recognize it /' but since then I have 

 seen it frequently ; it is situated in plurality just in front of the 

 nucleus, as in Eughjpha pleurostoma, H. J. C. (fig. 19 c). 



Ovules. — At p. 224 I have stated, respecting the "ovules" of 

 Infusoria, that "they occur m. Euglypha aheolata, Duj., con- 

 gregated round the hyaline capsule of the nucleus, from forty to 

 fifty in number," &c. I have also observed this in another spe- 

 cies, viz. the one just mentioned, for which I propose the name 

 " E. pleurostoma" ; and the same kind of development described in 

 the "larger vai-iety" of E. alveolata, p. 227, figs. 32, 33, as well 

 (fig. 19, e, i). E. pleurostoma is very like Ehrenberg^s Difflugia 

 Enchehjs and Dujardin's Trinema acinus, but not being identical 

 w^ith the figure given of the former, and though often presenting 

 three radiated prolongations of the diaphane like the latter, 

 but by no means constantly, it becomes necessary to give it a 

 name. It is just possible hereafter that all three may be found 

 to be the same, but even then it would be well to retain the 

 term " Euglypha," because E. pleurostoma is essentially of this 

 genus; the only differences between it and E. alveolata being the 

 lateral position of the mouth and the circular figure of the scales 

 in the former. 



At p. 231, figs. 39, &c., under the head of "Impregnation," 

 it is stated that many of the ovules of Spongilla, when pressed 

 out from the seed-like body, have a small granule or cell "in 

 diflferent degrees of connexion with" them, from simple approxi- 

 mation to almost undistinguishable incorporation ;" the same is 

 the case with the ovules of Euglena viridis (fig. 16). 



* Quart. Journal Microscop. Science, vol. i. p. 35. 



3* 



