54 F. B. PEITSCH. 



curvature of the raphe at the ends of the valves, and in the widely separated strise. 

 Some of the specimens (fig. 100) of N. stauropteroides showed practically no dilation 

 of the poles of the valves. 



NITZSCHIACE^. 



Genus Hantzschia Grun. 

 89. Hantzschia amphioxys. 



Hantzschia amphioxys (Ehrenb.) Grun., in Cleve and Granow, Arct. Diat., K. Sv. Vet.-Ak. Handl., XVII. 

 (1880), No. 2, p. 103. 



Long. valv. — 37-42 yu, ; lat. valv. = 7-8 ^. 



Hah. — Freshwater pond. Granite Harbour, January 20th, 1902. 



90. Hantzschia elongata. 



Hantzschia elongata (Hantzsch) Grun., in Cleve and Grunow, op. cit., p. lOi ; Van Heurck, op. cit., p. 169, 

 PI. LVI., figs. 7 and 8. 



Long. 176 /a; lat. 10 ju.. 



Hah. — Gap pond. Winter Harbour ; rare. 



SUEmELLACE.j:. 



Genus Surirella Turpin. 

 91. Surirella angusta. 



Surirella angusta Kiitz., Bacill. (18^:4), p. 01, Tab. 30, fig. 52. 



Long. valv. = 30 /a ; lat. valv. = 8 )u,. 



Hah. — In freshwater ice under boulder. Cape Adare, January 9th, 1902. 



