FRESHWATER ALGiE OF THE WEST INDIES. 289 



Crass, fil. 40-16 fx ; crass, trich. 34-38 fj. 

 Hab. Shallow bays, Anguilla. No. 20. 



*47. Lyngbya ^ruglneo-c^rulea, Gomont, Monogr. des Os- 

 cillariees, p. 166, t. 4. ff. 1-3. Oscillaria rerugineo-cserulea, 

 Kuetz. Phyc. gener. p. 185 ; Tab. Phyc. i. p. 28, t. 39. f, ix. 



Crass, trich. 4-5'5 /j.. 



Hab. On leaves in warm stream, road to Roseau Lake (2500 f r.), 

 Domiiiica. No. 1178. On gro und (2000-3000 ft.), and in stream, 

 crater of Grrande Soufriere, Dominica. N os. 1832 and 1842. 



*48. Phormimum luridum:, Gomont, I. c. p. 185-6, t. 4. 

 ff. 17-18. Leptothrix lurida, Kuetz. 

 Crass, trich. 2 p. 

 Hab. Growing on sides of road, Fort Charlotte, St. Yincent. 



*49. P. fragile, Gomont, I. c. p. 183-4, t. 4. ff. 13-15. 

 Anabaena fragilis, Menegh. 

 Crass, trich. 1'7/z. 

 Hab. In stream, Wotten "VVaven, Dominica. No, 1249. 



Ord. Chhoococcacei'. 



*50. GrLOZociPSA gelatinosa, Kuetz. Phyc. gener. p. 174; 

 Tab. Phyc. i. t. 20. f. vi. b ; Babenh. Flor. Europ. Algar. ii. p. 39. 

 Diam. cell. 25-3 n ; diam. fam. 7*5-19 ju. 

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



Class BACILLARIE.E. 

 Ord. Eaphidie^. 



Fam. Cymbelle^. 



*51. Cymbella Cistttla, Kirchn. Cocconema Cistula, Hempr. 

 1828 ; Van Heurck, Diatom. (Engl, transl.) p. 149, t. 1. f. 45. 



Hab. On rocks, Castle Bruce Biver (2000-3000'ft.), Dominica. 

 No. 1697. 



*52. Encyonema. VENTRicosrM, Kuetz. Bacill. p. 80, t. 6. 

 f. 16. Cymbella ventricosa, Agardh. 

 Hab. "With the preceding species. 



