122 BOTANICAL RESULTS OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 



3. ? CHLAMYDOMONAS INTERMEDIA, Chod., Alg. Suisse, 1902, p. 135. 

 Samples 10 and 11, rather common. 



I am somewhat doubtful about the determination of this form. 



4. CHLAMYDOMONAS NIVALIS (Sommerf.), Wille, Algol. Notizen, xi., Nyt Magazin 

 f. Naturvidenskab, xli., 1903, pp. 147-148 (text fig. 1, A). 



Samples 4-6 (red snow !), common. 



Cf. description on p. 119; as suggested by Chodat, Wille, etc., these resting- 

 cells may include Lagerheim's C. sanguined. Diam. of resting-cells = 10-20 M. 



TEXT FIGURE 1. 



A, Chlamydomonas niralis (Sommerf. ), Wille, resting-cells from the red snow (xllOO); B, Navicula muticopsis, 

 V. Heurck, outline of an individual from sample 11 to show shape ( x 1030) ; C, Chlcninjdomonas, sp., resting-eells from the 

 red snow (cf. p. 119) (xllOO); D, resting-cells from the yellow snow (cf. p. 118) (x830); E, upper figure, Microcystis 

 merismopedioides, n. sp., surface-view of colony (cf. p. 130) (xllOO); lower figure, typical colony of the same ( x 540) ; 

 F, Sphxrocystis schroeteri, Chod., f. nivalis, n. f. from the yellow snow ( x 540) ; G, the same, showing division of cells of colony 

 ( x 830) ; H, Ccelastnim mieroporum, Naeg., f. irregulare, n. f. (cf. p. 126) ( x 1100). 



5. CHLAMYDOMONAS, sp. (text fig. 1, C). 

 Sample 4 (red snow !), rather common. 



Resting-cells in a wide sheath of mucilage ; diam. of cell alone = 9-10 

 mucilage = 20-28 M (see also pp. 119-120). 



of cell and 



PHACOTACE^. 



6. PTEROMONAS NIVALIS (Shuttelw.), Chod., Alg. Suisse, 1902, p. 145, fig. 70 ; Wille, 

 Algol. Notizen, xiii., Nyt Magazin f. Naturvidenskab, xli., 1903, p. 167-171, pi. iii., 

 figs. 46-51 (PL I., figs. 22-24 and 31). 



