COLLECTED IN THE SOUTH ORKNEYS, 227 
17. ScortEtLLA anvancrica, P. А. Fritsch: (Pl. 10. figs. 7-17 ; Pl. 11. 
phots. 1, 4, 6.) 
Cellule ellipsoidex circiter duplo longiores quam sunt late sex e pariete 
exstantibus alzeformibus processibus, qui extenduntur recti et tequidistantes 
inter duos fines cellule instructe. Unus par alarum oppositarum (alse 
principales) extenditur continuus circa cellulam ; duo alii pares alarum 
(ale laterales) separati sunt alis principalibus, et ab utroque fine cellule 
paulum exstantes introrsum subito eurvantur, ita ut in utroque fine се] 
sinus formatus esse videatur (vcf. fig. 8 et 9). Ala quieque habet mediam 
incisuram propriam speciei. Cellula continet. multum adipis flaventis : 
eytioplasmatis structura investigari non potest. Spore perdurantes сит 
membrana crassa et undulata sunt formate metamorphosi | cellularum 
vulgarium. — Propagatio (?) subdivisione cellule immutate aut spore 
perdurantis in paucas partes possibile videtur. 
Long. cell. ab altero fine ad alterum =43-49 и (interdum 55 p); lat. veri 
corporis cell. 216-214: lat. totius cell. (7. e. сит alis) 228-30 ш (interdum 
42 u). 
Samples 1-3 (yellow snow !), 5 and 6 (red snow 1), 9, 11, and 15 ; rather 
common in yellow and red snow, rare in the other samples. Largest 
individuals in red snow. 
А full description and consideration of this species will be found on 
pp. 804-308, 
18. SCOTIELLA POLYPTERA, P. F. Fritsch. (РІ. 10. figs. 18-21.) 
Cellule late ellipsoidece, paulo longiores quam sunt late, magno numero 
alarum multo minus exstantium quam in 5. antarctica instructe. Alize 
plerumque sunt paulum directe in spiram et undulatie, ita ut adumbratio 
cellulæ videatur crenata ab omnibus partibus. Alæ exstant paulum ab 
utroque fine cellule et curvantur introrsum ita ut sinus debilis formetur. 
Adeps reservari non videtur. роге perdurantes ? — Propagatio subdivisiono 
cellularum vulgarium probabilis est. 
Long. cell. 220-24 ш ; lat. cell. — 16-17 р. 
Samples 1 and 3 (yellow snow 1), very rare; as an oeeasional form in 
samples 10, 11, and 15. 
This species has been considered more fully on pp. 308-309. 
19. ?RaPHIDIUM PYRENOGERUM, Chod. Algues vertes de la Suisse, 1902, 
p. 200, fig. 119. (РІ. 10. fig. 34.) 
Samples 1 and 3 (yellow snow !), rare. 
Cf. p. 818. The forms observed are possibly referable to a distinct species, 
but the material was insufficient to come to definite conclusions on this point. 
Width of cells =2 y. 
LINN, JOURN.—BOTANY, VOL, XL. 2A 
