FRESHWATER ALG^E OF THE SOUTH ORKNEYS. 123 



Samples 1-3 (yellow snow!), isolated. 



This species should probably he transferred to the genus Scotiella (cf. pp. 109-111). 

 Length of individuals = 'I'l M ; breadth = 12 /. 



TETRASPORA CEsE. 



7. SPH.EROCYSTIS SCHROETERI, Chod., Bull. Herbier JBoissier, v., 1897, p. 296, 

 pi. ix. 



Forma nivalis, n. f. (text fig. 1, F-G ; PL II., phot. 2, 8 (cf. pp. 113-115)). 



Familiar microscopies forma paulo irregulariore quam in specie typica; cellulse ante 

 divisionem reservant abundantiam adipis, qui invenitur in cellulis filialibus ; cellulse 

 sunt saspe ellipsoidese. Diam. cell. = 7-12 M ; diam. cell. fil. = 2-3 M. 



Samples 1 and 3, especially common in the latter. 



PROTOCOCCACEM. 



8. CHLOROSPH.BRA ANTARCTICA, n. sp. (PI. I., figs. 2-6 ; PI. II., phots. 1,3, 5, 6, (7). 

 Cellulse aut magnse sphsericse singulse aut parvse, paulum angulares, in familias 



parvas consociatas ; cellular magnse et interdum cellulse parvse vagina mucosa ampla 

 mimitjB ; membrana inodice incrassata, plerumque prasbentes duo strata ; chromatophora 

 fere sphaarica cum foramine parvo in una parte ; adeps semper adest abuudans in 

 cellulis ; paucas gran ul SB amylaceae plerumque adsunt. Propagatio per divisionem ; 

 zoosporas non inveni. Diam. max. cellulas magnse = 43 M ; diam. min. cell, parvas = 7 M 

 (omnes transitiones inter duas dimensioues) ; diam. cell, plerumque = 11 M-2 6 M ; diam. 

 vaginse mucosse = 39-50 /u (cell. pertinentes = 26-28 M). 



Probably nearly allied to C. angulosa, Klebs. (cf. p. 104). 



Samples 1-3 (yellow snow !), very abundant. 



For full consideration, see pp. 103-104. 



9. TROCHISCIA HYSTRIX (Reinsch), Hansg., Hedwigict, 1888, p. 129; Reinsch, 

 Uber Acanthococcus, Ber. Deutscli. Bot. Ges., 1886, p. 241, tab. xi., fig, 25. 



Sample 10, rare; previously recorded from South Georgia (Reinsch). 



10. TROCHISCIA RETICULARIS (-Reinsch), Hansg., Prodr. Algenflora v. Bohmen, ii., 

 1892, p. 241. 



Sample 10, rather common. 



A small form of this species ; diam. cell. = 10 M. 



11. TROCHISCIA ANTARCTICA, n. sp. (PI. L, fig. 30). 



Cellulas spheericse solitaria? cum membrana crassa gelatinosa numerosis processibus 

 cuneatis truncatis obtectae et junctis reticulo costarum ; chromatophorse ? ; cellulse cum 

 cytoplasmate grauuloso, semper granulas amylaceas et interdum aliquautum adipis 

 includente. Propagatio ? Diam. cell. = 10-13 M ; crassitude membranse = 2-3 M. 



