THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[THIRD SERIES.] 



" perlitora spargite museum. 



Naiades, et circClm vitreos cousidite foiites : 

 PoUice virgineo tencros hic carpite florcs : 

 Floribus et pictum, divce, replete canistrum. 

 At vos, o Nymph.-E Craterides, ite sub undas ; 

 Ite, recurvato variata corallia trunco 

 Vellite muscosis e rupibus, et mihi conchas 

 Ferte, Dese pelagi, et pingui conchylia succo." 



N.Pai'thenii Giannettasii Eel. 1. 



No. 13. JANUARY 1859. 



I. — On Fecundation in the two Volvoces, and their Specijic 

 Differences; on Eudorina, Spongilla, Astasia, Euglcna, and 

 Cryptoglena. By H. J. Carter, Esq., H.C.S. Bombay. 



[With a Plate.] 



VV HEN I found Eudorina elegans undergoing fecundation, at 

 the commencement of June last*, it was very evident to me that 

 I had observed the same kind of process in Volvox globator ; and 

 on referring to my note-book, sketches of it were found, under 

 date of the 18th of August, 1855, with mention of the pool of 

 water from which the specimens had been obtained. I there- 

 fore then determined to watch for the return of this organism 

 in the same pool when the month of iVugust arrived, and, having 

 done so, found it, as before, at first in company and afterwards 

 in separate colonies, in the same pool with V. stellaius, and both 

 undergoing fecundation, but this time as early as the 5th of 

 August. 



As soon as this was perceived, I followed the process as long 

 as the colonies, which were rapidly being devoured by Rotatoria 

 and Entomostracous Crustacea, lasted, and thus not only ob- 

 served most of the facts connected with this process, but also 

 sufficient to prove to me that the two Volvoces, which by Busk, 

 * Annals, ser. 3. vol. ii. p. 23/. 



Ann. S^ Mag. N. Hist, Ser. 3. Vol. iii. 1 



