COLLECTED IN THE SOUTH ORKNEYS. 335 
adeps semper adest abundans in cellulis ; рапса granule amylaceæ plerumque 
adsunt. Propagatio per divisionem ; zoosporas non inveni. 
Diam. max. cellulee таспа =43 р; diam. min. cell. parvee =7 ш (omnes 
transitiones inter duas dimensiones) : diam. cell. plerumque =11-26 р; 
diam. vaginze mucose =39—50 р (cell. pertinentes = 26-28 д). 
Probably nearly allied to C. angulosa, Klebs (cf. p. 303). 
Samples 1-3 (yellow snow |), very abundant. 
For full consideration, see рр. 302-804. 
9. ТкосніѕстА Hystrix (Reinsch), Hansg. in Hedwigia, xxvii, 1888, p. 129 ; 
Reinseh, Ueber Acanthococcus, in Ber. Deutsch. Bot. Ges. iv. 1886, 
p. 241, t. 11. fig. 25. 
Sample 10, rare ; previously recorded from South Georgia (Reinsch). 
10. TROCHISCIA RETICULARIS (Reinsch), Hansg. Prodr. Algenflora v. Böhmen, 
ii. 1892, p. 241. (Diam. cell. =10 р.) 
Sample 10, rather common. 
A small form of this species. 
11. TROCHISCIA ANTARCTICA, F. №. Fritsch. 
Cellule sphzerieze solitarie cum membrana crassa gelatinosa numerosis 
processibus cuneatis truncatis obtectee et junctis reticulo  costarum ; 
chromatophore ? ; cellule cum cytioplasmate granuloso, semper granulas 
amylaceas et interdum aliquantum adipis includente. Propagatio ? 
Diam. cell. 210-12 u ; crassitudo membrane = 2-3 p. 
Probably allied to 7. reticularis (Reinsch), Hansg. 
Samples 1-3 (yellow snow !), fairly common. 
For full consideration, see pp. 816-817. 
12. Trocuiscta NIVALIS, Lagerh. in Ber. Deutsch. Dot. Ges. x. 1892, p. 530 
& pl. 28. fig. 28. (PI. 10. fig. 29.) 
Sample 11, rare. 
The individuals were rather smaller than those described by Lagerheim 
(diam. cell. =10 ш), but, as in his form, covered with very numerous minute 
spines ; one (or more ?) pyrenoids were visible in every case. There appear 
to be several chloroplasts. 
13. TROCHISCIA PACHYDERMA (Reinsch), Hansg. in Hedwigia, xxvii. 1888, 
р. 128 ; Reinsch, Ueber Acanthococcus, in Ber. Deutsch. Bot. Ges. lv. 
1886, p. 240, t. 11. figs. 8—9. 
Samples 10 and 11, fairly common. 
