FRESHWATER ALGE OF THE WEST INDIES. 289 
Crass. fil. 40-16 u; crass. Dich, 34-38 p. 
Hab. Shallow bays, Anguilla. No. 20. 
#47. LYNGBYA MHRUGINEO-CHRULEA, Gomont, Monogr. des Os- 
cillariées, p. 166, t. 4. ff. 1-3.— Oscillaria arugineo-cerulea, 
Kuetz. Phye. gener. p. 185; Tab. Phyc. i. p. 28, t. 39. f. ix. 
Crass. trich. 4-5°5 u. 
Hab. Onleaves in warm stream, road to Roseau Lake (2500 ft.), 
Dominica. No. 1178.—On ground (2000-3000 ft.), and in stream, 
crater of Grande Soufrière, Dominica. Nos. 1832 and 1842. 
#48. PHORMIDIUM LURIDUM, Gomont, l. c. p. 185-6, t. 4. 
ff. 17-18.— Leptothrix lurida, Auetz. 
Crass. Dich, 2 u. 
Hab. Growing on sides of road, Fort Charlotte, St. Vincent. 
*49. P. FRAGILE, Gomont, l. c. p. 183-4, t. 4. ff. 13-15.— 
Anabeena fragilis, Menegh. 
Crass. trich. 177 p. 
Hab. In stream, Wotten Waven, Dominica. No. 1249. 
Ord. CHROOCOCCACEE. 
*50. GLEOCAPSA GELATINOSA, Äuetz. Phyc. gener. p. 174; 
Tab. Phyc. i. t. 20. f. vi. b; Rabenh. Flor. Europ. Algar. ii. p. 39. 
Diam. cell. 25-3 u; diam. fam, 7:5-19 u. 
Hab. On banks, Morne Micotrin, Dominica. No. 1109. 
Class BACILLARIEE. 
Ord. RAPHIDIE.. 
Fam. CYMBELLEE. 
*51. CYMBELLA CrsTULA, Kirchn.—Cocconema Cistula, Hempr. 
1828; Van Heurck, Diatom. (Engl. transl.) p. 149, t. 1. £. 45. 
Hab. Ou rocks, Castle Bruce River (2000—3000'ft.), Dominica. 
No. 1697. 
*52. ENcYONEMA VENTRICOSUM, Kuetz. Bacill. p. 80, t. 6. 
f. 16.—Cymbella ventricosa, Agardh. 
Hab. With the preceding species. 
