I i;l>ll\\ viT.K \i-.i '.-I Ml) SOUTH OMOTB1 125 



. 



S, .iMK.I.I \ Ml |H 



Cellula- el. in utroque tino rotundaUu processibus alwformilniH plus minusve 



longitii'ltii:ilil>iis sex nut mult i- muiiita) ; ala suut aut rectie aut undulatoj ; chroma- 

 t'>|i!i<>r.iiii siiiirularem esse probabile est, cum pyrciioide ; abundantia et adipis in una 

 .sp.-.-ie. Propagatio subdiviaione cellula) immutatiu aut sponc perdurantis in paucas 

 partes verisimilc est Sporo perdurantes cum tnenibrnnis valde iucrassatis trans- 

 tiu'iiratintic r.-llularum vulgarium formari videntur. 



This genua is certainly a close ally of Oocystis (</. ]>. I OH). I think it very probable 

 that Pteromoruu nivalis (Shuttlw.), (.'hod., is a species of this genus (<('. p. 1 10). 



17. SCOTIELLA ANTARCTICA, U. 8p. (PI. I., figs. 7-17 I PI. II., phots. 1, 4, , &'). 



Celluhu ellipsoideaj circiter duplo longiores quam aunt latas sex e pariete exstantiluis 

 alaoformibus processibus, qui extonduntur recti et {cquidistantcs inter duos lines cellula> 

 instructa). Unus par alarum oppositarum (alaj principales) extenditur continuus circa 

 eelliilam ; duo alii pares alarum (alie laterales) sej>arati suut alis principalilxis, et ab 

 utroque fine .Hula- paulum exstautes introrsura subito curvantur, ita ut in utroque fine 

 rellulw sinus formatus ease videatur (cf. fig. 8 et 9). Ala qutoque habet mediam 

 incisuram propriain speciei. Cellula continct inultum adipis Harentis ; cytoplasmatis 

 structura investigari non |*otest. Spora* peidimotOI I'uni incnil>nina crassa et undulata 

 sunt formata) metamorphosi (rclliilariiin vulgarium. 1'ropagatio (?) subdivisioM ct-llula 1 

 immutatnj aut aponc perdurantis in paucas partes possibile videtur. Ix>ng. cell, ab 

 alter.) fine ad alterum = 43-49 M (interdura 55 M) ; lat veri corporis cell. 16-21 M; 

 lat. totius cell. (i.e. cum alia) = 28-30 M (interdum 42 M). 



Samples 1-3 (yellow snow!), 5 and 6 (red snow!), 9, 11, and 15; rather common 

 in yellow and red snow, rare in the other samples. Largest individuals in red snow. 



A full description and consideration of this species will be found on pp. 105-108. 



18. SCOTIRLLA POLYPTERA, n. 8p. (PI. I., figs. 18-21). 



Cellula) late ellipsoideir, paulo lougiores quam sunt lata.-, magno numero alarum 

 imil to minus exstantium <juam in S. antarctica instructa). Ala? plerumque sunt 

 paulum directs; in spiram ct undulata), ita ut adumbratio cellula) videatur crenata 

 ab omnibus partibus. Alae exstant paulum ab utroque fine cellula) ct curvantur 

 introrsum ita ut sinus debili.s formetur. Adeps reservari uon videtur. Spone pT- 

 durantoa? Propagatio subdivisione cellularum vulgarium prolialiilis est Long. cell. = 

 20-24 n ; lat cell. 16-17 M. 



Samples 1 and 3 (yellow snow !), very rare; as an occasional form in samples 10, 

 11, and 15. 



This species has been considered more fully on pp. 108-109. 



19. ? RAPHIDIUM PYRKNOGKRUM, Chod., Algws vertet de la Suisse, 1902, p. 200, 

 fig. 119 (PI. I., fig. 34). 



Samples 1 and 3 (yellow snow I), rare. 



