TKESHWATER ALGJE OF THE WEST INDIES. 291 



Hah. In small stream, Eoseau Valley, Dominica. No. 1176. 

 In stream, Wotten Waven, Dominica. No. 1248. 



*61. Navicula gracilis, Kuetz. Bacill. p. 91, t. 3. f. 48; Van 

 Heurck, I. c. p. 179, t. 3. f . 109. 



Hah. On bank at roadside, Emsol, near Eoseau, Dominica. 

 No. 983. 



62. N. cryptocephala, Kuetz. ; TV. Sm. Brit. Dial. p. 53, 

 t. 17. . 155. 



Hah. In warm stream, road to Eoseau Lake (2500 ft.), 

 Dominica. No. 1177. In stream, Wotten Waven, Dominica. 

 No. 1248. 



*63. N. elliptica, Kuetz. Bacill. p. 98, t. 30. f. 55 ; Van 

 Heurck, I. c. p. 20 L, t. 4. f. 156. 



Hah. On leaves of trees and in stream, Wotten "Waven, 

 Dominica. Nos. 1240 and 1249. 



*64. N. coxtenta, 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, I. c. p. 230, t. 5. f. 240. 



Hah. On leaves of trees, Wotten Waven, Dominica: very 

 abundant. No. 1240. Also scarce in stream, Wotten Waven, 

 Dominica. No. 1249. 



65. Vanthettrceja rhomboides, Breh.; Van Heurck, Diatom. 

 (Engl, transl.) p. 240, t. 5. f. 249. Erustulia rkomboides, 

 De Toni, Sylloge Algar. h. p. 227. Navicula rhomboides, Ehrenh.; 

 W. Sm. Brit. Diat. i. p. 46, t. 16. f. 129. 



Hah. On bank, near Eoseau Lake (2700 ft.), Dominica. 

 No. 1180. In stream, Wotten Waven, Dominica. Nos. 1248 

 and 1249. 



Var. saxonica. Erustulia saxonica, Baienh. Navicula crassi- 

 nervia, Breh. in TV. Sm. Brit. Diat. i. p. 47, t. 31. f. 271. 



Hah. On banks, Morne Micotrin, Dominica. No. 1109. On 

 roadside near Eoseau Lake (2700 ft.), Dominica. No. 1160. 

 On leaves in warm stream and on bank, road to Eoseau Lake 

 (2500-2700 ft.), Dominica. Nos. 1178 and 1222. Head of 

 Castle Bruce Eiver, Dominica. No. 1484. 



