THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[FOURTH SERIES.] 



No. 16. APRIL 1869. 



XXXIII. — Notes on Filigerous Green Infusoria of the Island 

 of Bombay. By H. J. Carter, F.R.S."&c. 



[Plate XVII. figs. 10-24] 



Many species of Euglena have been described, and allusion 

 made to their occasionally tessellate-encysted and frond-like 

 forms, but in no previous instance, I think, has the cyst been 

 shown to present a trumpet-shaped extension like the follow- 

 ing, which peculiarity, more than anything in the Euglena it- 

 self, seems sufficient to entitle it to a distinct appellation. 



Euglena tuba, mihi. 



Active state. — Fusiform, cylindrical, fish-shaped ; obtuse 

 anteriorly, where it terminates in the so-called double lip and 

 single cilium ; posteriorly terminating in a short, pointed, trans- 

 parent caudal prolongation. Eye-spot, contracting vesicle, 

 nucleus, and general contents the same as in Euglena viridis, 

 Ehr. (PI. XVII. fig. 13). 



Encysted state. — Cyst gelatinous, globular, transparent, co- 

 lourless, with polar elongations corresponding to the anterior 

 and posterior extremities of the Euglena : posterior one short, 

 pointed, closed ; anterior one extended into a tubular prolon- 

 gation, which ends in an open trumpet-shaped expansion. 

 Size of body of largest cyst 1 -600th of an inch in diameter ; 

 tubular extension of equal length (figs. 10-12). 



Hab. Fresh water, spreading by division, during encystment, 

 over the surface of the water in a deep quarry-pit tank, in 

 the island of Bombay, throughout the dry season. Forming 

 frond-like aggregations, one cell deep, united net-like by con- 

 stricted portions, and surrounded generally by a soft gelatinous 

 envelope ; finally extending over the whole of the tank, to 

 whose surface it imparts a more or less ferruginous tint, arising 



Ann. & Mag. N. Hist. Ser. 4. Vol. iii. 19 



