48 F. E. FRITSCH. 
FRAGILARIACEA, 
Genus Fracirarta Lyneb. 
72. FRAGILARIA. CURTA. 
(Ge NU amen 1276) 
Fragilaria curta Van Heurck, Result. du voyage du 8.Y. ‘ Belgica,’ Bot., Diatomées (1909), p. 24, Pl. HT., 
fig. 37. 
Long. valv. = 19 p; lat. valv. = 6p. 
Hab.—Pond some distance behind hut, Cape Adare, January 9th, 1902 (isolated). 
The specimens agreed in all respects with Van Heurck’s description and figure. 
The valve is very slightly wider at one end than at the other. The strie are 
interrupted in their transverse course by a scarcely perceptible division, the last three 
or four at each end being curved. 
73. ? FRAGILARIA LINEARIS. 
Fragilaria linearis Castracane, ‘ Chall.” Rep., Diatom. (1886), p. 56, Pl. XXV., fig. 12. 
Long. valv. = 38; lat. valv. = 6°5 p. 
Lab.—Pond some distance behind hut, Cape Adare, January 9th, 1902 (isolated). 
74. FRAGILARIA OBLIQUECGOSTATA. 
Fragilaria obliquecostata Van Heurck, op. cit., p. 25, Pl. IIL, fig. 38. 
Hab.—Pond ‘some distance behind hut, Cape Adare, January 9th, 1902 (mostly 
only broken valves). 
75. FRAGILARIA TENUICOLLIS. 
Var. ANTARCTICA. 
Fragilaria tenwicollis Heib., Consp. crit. Diat. danic. (1863), fig. XIII.; Rabenhorst, Fl. Europ. Alg., i. 
(1864), p. 119. 
Var. antarctica W. and G. 8S. West, op. cit., p. 279, Pl. XXVL., fig. 128. 
Long. valv. = 37-46 w; lat. valv. = 3-3°5 p. 
/lab.—Damp spot, summit of Cape Adare, January 9th, 1902; on ice, four feet 
above frozen watercourse through ‘‘ Penknife ice,” McMurdo Bay, September 13th, 
1902; pond in ice off Black Island, MeMurdo Strait, December 31st, 1902. 
This form was relatively abundant. Many of the valves were rather longer than 
those recorded by Messrs. West. 
