50 F. E. FRITSCH. 
DIATOMACEA. 
Genus Dratroma D.C, 
77. DIATOMA ELONGATUM. 
Var. EHRENBERGI. 
(PLT fies 525515242) 
Diatoma elongatum Ag., Syst. Alg. (1824), p. 24; Miitz., Bacill. (1844), p. 48, t. 17, fig. xviir., 1, 2. 
Var. ehrenbergi (Kiitz.) W. Sm., Brit. Diat. ii. (1856), pp. 40-41, Pl. XLL., fig. 311 B (D. ehrenbergti 
Kiitz., Bacill. (1844), t. 17, fig. xvir., 1-8). 
Long. valv. = 26-32 p. 
” 
Hab.—On ice, four feet above frozen watercourse through “ Penknife ice, 
MeMurdo Bay, September 13th, 1902. 
This variety has already been recorded from the Antarctic by Van Heurck (op. cit.). 
The ends of the frustules often appeared somewhat rounded in girdle-view (fig. 152). 
(Ox- 
5 
ACHNANTHACEE. 
Genus ACHNANTHES Bory. 
78. ACHNANTHES BREVIPES. 
Var. INTERMEDIA. 
Achnanthes brevipes Ag., Syst. Alg. (1824), p. 1. 
Var. intermedia (Kiitz.) Cleve, Synops. Navic. Diat., ii. (1895), p. 193 (A. subsessilis Kiitz.). 
Long. valv. = 30-31°5y; lat. valv. = 9-9°5 p. 
Hab.—On Phormidium on ice, four feet above frozen watercourse through 
‘Penknife ice,” McMurdo Bay, September 13th, 1902 (rare). 
The specimens agreed in all respects with those described and figured by Messrs. 
West (op. cit., p. 280, Pl. XXVL, figs. 126-127). 
NAVICULACEK. 
Genus Srauroners Ehrenb. 
79. STAURONEIS ANCEPS. 
Var. AMPHICEPHALA. 
Stauroneis anceps Whrenb., Verbr. u. Hinfl. d. mikr. Lebens, etc. (1843), p. 134, Tab. IL., 1, fig. 18 ; 
Smith, Brit. Diat., i. (1853), p. 60, Tab. XIX., fig. 190. 
Var. amphicephala Kiitz., Bacill. (184+), p. 105, Tab. 30, fig. 25. 
Long. valv. = 28»; lat. valv. = 8 p. 
Hab.—Freshwater pond, Granite Harbour, January 20th, 1902 (rare). 
