\ I I i: \l.;.i: oh Mil. smill <,|;K\I^ ..; 



64. NAVIMI.A .\iuricoP8i8, Van //".;(-, DiatomJes, R&tilt. voyage du s.y. 

 " Belgica," Aovere, 1909, p. l-J. i:il.. -J. li- IM (t.xt fig. 1, 15, \>. i 



Sample* 8, 9, 10, 11, and 15, cum moo ; previously recorded from the Antarctic 

 (Van H.-ur.k, M-M- \\V>t). 



I.rn-tli !!' v. ilve -21-24 n ; l>readth (at widest point)- 10 n. 



In most of the individuals the sidi int.- flat. Inn in others tln-v were somewhat 



.uviifd ; ends pronoonotdlj swollen in a capitate manner. Such capitate forms 

 ;i|iproach N. dicephala (Ehrb.). \V. Smith. 



65. ? NAVICCLA LUCIDOLA, Gran. ; Van Heurck. Adas, 1880-81, pL xiv., fig. 40. 

 Sample 9, rather rare. 



Certainly a very close ally of this species. 



66. NAVICULA MDTICA, KiUz. ; Van Heurck, Synopsis Dial., 1885, p. 95, pi. x., 

 fig. 17. 



Samples 8, 9, 10, 13, and 17, common; previously recorded from the Antarctic 

 (Reinsch, Holmboe). 



Length of valve- 16-35 M ; breadth 7-11 M (incl. f. Goppertiana, Bleisch). 



67. AMPHORA OVALIS, Ktitz,; Van Heurck, Synopsis Diat., 1885, p. 59, pi. i., 

 fig. 1. 



Sample 4 (red snow !), isolated ; the var. gracilis has previously been recorded from 

 Kerguelen (Reinsch). 



68. GOMPHONEMA MoNTANUM, Schum. ; Van Heurck, Synopsis Dial., 1885, p. 124, 

 pi. xxiii., figs. 33 and 36. 



Sample 9, isolated specimens. 



EXPLANATION OF THE PLATES. 







PLATB I. 



Fig. 1. Prototltrma brotcnii, n. sp. A small portion of one of tlte sheeU of cells formed by this upecie* 

 ( x 830). 



Figs. 2-6. Chlorotphtrra antarctica, n. sp. Fig. 2. Largo isolate! cell with a wide mucilage-sheath and 

 a quantity of fat in the cell-contents ( x 540). Fig. 3. A group of small cells without mucilage-sheath ; fat 

 equally diffused through the contents (xllOO). Figs. 4-5. Oval cells with segregated masses of fat; 

 possibly a stage in which the cells are preparing to divide (</. p. 104) ( x 830, 730 respectively). Fig. 6. A 

 cell in which the fat is very prominently developed ( x 540). 



Figs. 7-11. Sootiella antaretita, n. sp. 1-2 -principal wings; 3-4 and 5-6-the two pairs of lateral 

 wings ; pw - principal wings. Fig. 7. A rather small normal individual, as seen when the principal wings 

 are parallel to the substratum ( x 830). Figs. 8, 9. Two oblique end-views of the organism to show the 

 course of the wings ( x 830). Fig. 10. Part of a normal individual in which the principal wings are inclined 

 to the substratum ( x 540). Fig. 11. An individual seen in optical section ( x 430). 



Figs. 12-16. SeoiieUa antaretita, n. sp. Stages in formation of rwting-spores (T). Fig. 12. An 

 individual in which the wings have lost iu definition (x540). Figs. 13, 14, 15. Three stages in the 



