FRESHWATER ALGJE OF THE WEST INDIES. 291 
Hab. In small stream, Roseau Valley, Dominica. No. 1176.— 
In stream, Wotten Waven, Dominica. No. 1248. 
#61, NAVICULA GRACILIS, Kuetz. Bacill. p. 91, t. 3. f. 48; Van 
Heurck, l. c. p. 179, t. 3. f. 109. 
Hab. On bank at roadside, Emsol, near Roseau, Dominica. 
No. 983. 
62. N. CRYPTOCEPHALA, Äuetz.; W. Sm. Brit. Diat. p. 53, 
t. 17. f. 155. 
Hab. In warm stream, road to Roseau Lake (2500 ft.), 
Dominica. No. 1177.—In stream, Wotten Waven, Dominica. 
No. 1248. 
#63. N. ELLIPTICA, Kuetz. Bacill. p. 98, t. 80. f. 55; Van 
Heurck, l. c. p. 201, t. 4. f. 156. 
Hab. On leaves of trees and in stream, Wotten Waven, 
Dominica. Nos. 1240 and 1249. 
*64. N. CONTENTA, Grun. in Van Heurck, Atlas, t. 14. 
f. 31*, sub. n. N. trinodis; Van Heurck, Diatom. (Engl. transl.) 
p. 230, t. 5. f. 239. 
. Var. BICEPS, Van Heurck, l. c. p. 230, t. 5. f. 240. 
Hab. On leaves of trees, Wotten Waven, Dominica: very 
abundant. No. 1240.—Also scarce in stream, Wotten Waven, 
Dominica. No. 1249. 
65. VANHEURCKIA RHOMBOIDES, Bréb.; Van Heurck, Diatom. 
(Engl. transl) p. 240, t. 5. f. 249.—Frustulia rhomboides, 
De Toni, Sylloge Algar. ii. p. 227.—N avicula rhomboides, Ehrenb.; 
W. Sm. Brit. Diat. i. p. 46, t. 16. f. 129. 
Hab. On bank, near Roseau Lake (2700 ft.), Dominica. 
No. 1180.—In stream, Wotten Waven, Dominica. Nos. 1248 
aud 1249. 
Var. SAXONICA.— Frustulia saxoniea, Rabenh. Navicula crassi- 
nervia, Bréb. in W. Sm. Brit. Diat. i. p. 47, t. 31. f. 271. 
Hab. On banks, Morne Micotrin, Dominica. No. 1109.—On 
roadside near Roseau Lake (2700 ft.) Dominica. No. 1160.— 
On leaves in warm stream and on bank, road to Roseau Lake 
(2500-2700 ft.), Dominica. Nos. 1178 and 1222.—Head of 
Castle Bruce River, Dominica. No. 1484. 
