Fresh-water Algte, &c. By A. W. Bennett. 9 



Euastrum Didelta Turp. 



ansatum Ehrb, 



circiilare Hass. 



pectinatum Breb. 



gemmatum Breb. 



rostratum Ealfs. 

 Euastrum ornithooephalum n. sp. Fig. 12. 



Frond minute, 57 jj, long, 80 //. broad. Eacli frustule with a 

 basal and central rounded lobe, and a terminal lobe moderately 

 deeply divided vertically, and with a single projecting tooth, the 

 lobe resembling a bird's head. Sutural division somewhat shallow. 

 Cell-wall tuberculated. Near to E. rostratum and to E. pseud- 

 elegans Turn. (Journ. R. Micr. Soc, 1885, p. 935), from the 

 United States, but somewhat larger; the terminal lobe resembling 

 that of E. elegans. Bog pool, Loughrigg. 



Euastrum elegans Breb. /S inerme Ealfs. 



„ binale Turp. 

 Euastrum Lundellii n. sp. {E. binale y elobatum Lund., 

 Desm. Suec, p. 23, t. ii. f. 7). Fig. 13. 



Frond very minute, 28 jju long, 14 /i broad, truncately elliptical 

 in outline. Frustule three-lobed ; terminal lobe truncate, gibbous, 

 slightly concave, entire, 11 /* broad. Sutural constriction deep. 

 Each frustule with a moderately conspicuous projection in the 

 centre. 



Among Sphagnum, Loughrigg. Agrees in form and size with 

 Lundell's variety of E. hinale, but seems sufficiently distinct to 

 merit specific rank. 



Euastrum erosum Lund. 

 „ insulare Wittr. 

 „ crenatum Ktz. (Phyc. Germ., p. 135). Fig. 14. 



Frond minute, about the size of E. elegans, 45 /^long, 30 fx, 

 broad, hexagonal in outline ; terminal lobe with quite straight ex- 

 tremity and very slight vertical incision, 20 /u, broad. Each frustule 

 with about three shallow crenations on each side. Suture shallow. 

 Cell- wall not punctated. 



Bog pool, Loughrigg. This httle-known species presents well- 

 marked distinctions from E. elegans. Although named in Ralfs's 

 ' British Desmidieae,' it does not appear to have been noticed in 

 Britain before. 



Cosmarium sublobatum Arch. (Euastrum suhlohatum Breb). 

 This species seems clearly to have been placed in the wrong 

 genus by Brebisson and Ralfs. 



