54 F. HE. FRITSCH. 
curvature of the raphe at the ends of the valves, and in the widely separated striz. 
Some of the specimens (fig. 100) of N. stauroptercides showed practically no dilation 
of the poles of the valves. 
NITZSCHIACEA. 
Genus Hanrzscuta Grun. 
89. HANTZSCHIA AMPHIOXYS. 
Hantzschia amphiorys (Khrenb.) Grun., in Cleve and Grunow, Arct. Diat., K. Sv. Vet.-Ak. Handl., XVIL. 
(1880), No. 2, p. 103. 
Long. valv. = 37-42 w; lat. valv. = 7-8 p. 
Lab,—Freshwater pond, Granite Harbour, January 20th, 1902. 
90. HANTZSCHIA ELONGATA. 
Hantzschia elongata (Hantzsch) Grun., in Cleve and Grunow, op. cit., p. 104; Van Heurck, op. cit., p. 169, 
Pl. LVL., figs. 7 and 8. 
Long. 176; lat. 10 wu. 
Hab.—Gap pond, Winter Harbour ; rare. 
SURIRELLACE. 
Genus SvURIRELLA Turpin. 
91. SURIRELLA ANGUSTA. 
Surirella angusta Kiitz., Bacill. (1844), p. 61, Tab. 30, fig. 52. 
Long. valv. = 30; lat. valv. = 8 p. 
Lab,—In freshwater ice under boulder, Cape Adare, January 9th, 1902. 
