Infusoria of the Island of Bombay. 255 



rock in the island of Bombay, on the 17th June 1861, some 

 days after the rainy monsoon had commenced and this exca- 

 vation had become filled with rain-water. Size of the cell 

 1-981 th inch long by l-1350th broad. 



In some of these cells the single nucleus had been replaced 

 by several, as if preparatory to subdivision ; while in others 

 there were a great number of contracting vesicles scattered 

 throughout the cell-contents for the same purpose, if they did 

 not belong to parasitic cells (endophytes) otherwise invisible. 

 Lastly, some of these cells were observed to be encysted bi- 

 narily as in Gyges bipartitus, and some quaternarily, but not 

 further ; at the same time each subdivision was observed to be 

 provided with four cilia within its compartment respectively. 



And here my observations of this cell would have ended, 

 had there not also been binary compounds present, where one 

 of the 4-ciliated cells had been arrested in its further develop- 

 ment, while the other had become subdivided into the 16-cell 

 form, each cell of which was attached to the transparent glo- 

 bular capsule enclosing the whole, with the tivo cilia of each cell 

 projecting externally and all widely separated, as in Eudorina. 

 (I regret that there is not room in the plate for a figure of 

 this ; but probably I may have an opportunity of supplying it 

 hereafter.) 



Thus the transparent capsule was studded over with the 

 subdivisions of one of the 4-ciliated cells on one side ; while 

 in the other the 4-ciliated cell remained undivided, with its 

 contents shrunken and retracted from its own cell-wall (pro- 

 bably owing to the poisonous presence in it of some endo- 

 phyte). 



Hence I inferred that this 4-ciliated cell, which somewhat 

 resembled Gyges, was the primary active cell of Eudorina 

 elegans, viz. that stage which, when my figures and descrip- 

 tion of Eudorina under impregnation were published (Annals, 

 vol. ii., Oct. 1858), I was not able to supply. 



Add to this evidence the fact that for four successive years, 

 in the months of June and July respectively, the same ovoid 

 cell precisely stands figured in my journal, in connexion with 

 Eudorina elegans, obtained in abundance and under almost all 

 forms from different pools of water widely separated. 



An ovoid 4-ciliated cell, such as I have above described, 

 then, appears to be the primary active cell or sporozoid of 

 Eudorina. 



So far as my observation extends to the Chlamydococcus y 

 also figured with Eudorina (op. et he. cit) } its subdivisions, 

 even when still more numerous than there shown, remain free 

 and entirely within the parent capsule, whereas in both Eudo- 



