292 MESSRS. W. AND G. 8. WEST ON THE 
"66. VANHEURCKIA VULGARIS, Van Heurck, Diatom. (Engl. 
transl.) p. 240, t. 5. f. 252.—Colletonema vulgaris, Thwaites. 
Hab. In small stream, Roseau Valley, Dominica. No. 1176.— 
In stream, Wotten Waven, Dominica. Nos. 1248 and 1249. 
Fam. GoMPHONEMES. 
*67. GOMPHONEMA GRACILE, Ehrenb. ; Van Heurck, l c. p. 272, 
t. 7. f. 309. 
Var. DICHOTOMUM, Van Heurck, l. c. p. 273, t. 7. f. 310.— 
G. diehotomum, W. Sm. 
Hab. In warm stream, road to Roseau Lake (2500 ft.), 
Dominica. No. 1177. 
#68. G. angustatum, Kuetz. Baciil. p. 83, t. 8. f. 4. 
Hab. In warm stream, road to Roseau Lake (2500 ft.), 
Dominica. No. 1177.—In stream, Wotten Waven, Dominica. 
No. 1248. 
*69. G. OLIVACEUM, Kuetz. l. c. p. 85, t. 7. ff. 18, 15. 
Hab. In small stream, Roseau Valley, Dominica. No. 1170. 
70. G. TENELLUM, Kuetz.; W. Sm. Brit. Diat. i. p. 80, t. 29. 
f. 243. 
Hab. In stream, Wotten Waven, Dominica. No. 1249. 
Fam. ACHNANTHES. 
*71. ACHNANTHES LINEARIS, Grun.—Achnanthidium lineare, 
W. Sm. Brit. Diat. ii. p. 81, t. 61. f. 381. 
Hab. On banks, Emsol, Roseau, Dominica. No. 986.—In 
small stream, Roseau Valley, Dominica. No. 1176. 
*72. A. LANCEOLATA, Grun.—Achnanthidium lanceolatum, 
Bréb. in Kuetz. Spec. Algar. p. 54. 
Hab. Among Nostoc muscorum, Agardh, on sides of road, Fort 
Charlotte, St. Vincent. No. 203.— On leaves of trees, Wotten 
Waven, Dominica. No. 1210. 
Fam. CoccoxErDEx. 
#73. CoccoNEIS PEDICULUS, Ehrenb.; Kuetz. Bacill. t. 5. f. ix.1; 
W. Sm. Brit. Diat. i. p. 21, t. 3. f. 31. 
Hab. Attached to Lyngbya majuscula, Harv., in shallow bays, 
Anguilla. No. 20. 
