BY G. T. PLAYPAIR. 531 



Yar. ABNORMis, n.var. (Text-fig.To?). 



Cellula tota tubifoniiis, loni^-e pi'otracta noc corporo nrniformi 

 ill extremo instructa. 



Cell. lon^. e. 1.50-200, lat. 7-10//. Auburn. 



In this form, found with the t\'pe, the cell, probably bj- excess 

 of I'ain, is drawn out into a simple irregular tube, dehiscing at 

 the end. There are none of the inflations in the tube which 

 evidence previous attempts at forming the gonidangium. Repro- 

 duction probably by zoogonidia, and perhaps also by akinetes; 

 (Text-fig. 7/'). 



Fani. OOCYSTACE.E. 

 Genus E r r m o s p ii je r a De By. 



Eremosph.f.ra viRinis v. tetraedrica, n.var. (PI. Ivii., f.5). 



Forma tetraedrica, lateribiis valde arcuatis, nodibus 4 levissime 

 angulatis. 



Cell. diam. 110//. Lismore (308). 



A curious form, in which the cell looks as if it were an inflated 

 tetraedron. TIk^ sides are well arched, and the angles only 

 slightly marked. 



The hypnospore of E. viridis, which was described and figured 

 by me in Oorf/t^fis and JiJr/miosjjhcera, p. 11 6, f.G, I have lately 

 noted again in a fresh gathering (316) from Lismore. Outer cell 

 diam. 120, hypnospore 97/^. The scrobiculations are closer even 

 than figured, being only about their diameter apart, and the 

 scrobiculate membrane is backed, apparently, by the thick muci- 

 laginous lining often found in Er^'mosphcera. The contents were 

 green, but the chlorophyll seemed to be diffused in an even 

 parietal layer, no distinct chloroplasts being visible. 



Genus O o c v s t i s Nag. 

 OocvsTis ROTULA Pla.yf. (PI. Ivii., f.fi, 7). 



Ccenob. diam. oO, aiitosp. diam. 12/^. Lismore. 



Cf. Chodat, Entwickl. d. Erem. virid., f. 13, 21 ; Playfair, 

 Oocystis and Evpmosjjh., p. 130, PI. vii., f.31. Coenobium spheri- 

 cal, thin-walled, containing 8 spherical antospores. The latter 

 are thick-walled, each with a central pvrenoid and cuneate chlo- 



