FRESHWATER ALGLE OF THE WEST INDIES. 283 



*15. Pe^ium curtuac, Breb. in Kuetz. Species Algar. 1849, 

 p. 167. Closterium curtum, Breb. 1810. Cosrnarium curtum, 

 Balfs, Brit. Desm. p. 109, t. 32. f. 9. 



Hob. With the preceding species. 



*16. P. didymocarpum, Lund., " Desm. Saec."Act. Beg. Soc. 

 Sclent. Upsal. 1870, p. 85, t. 5. f. 9. 



Forma cellulis latioribus ; long. 29 p ; lat. 17 p. 



Hab. On banks. Morne Micotrin, Dominica. No. 110.9. 



This form is somewhat similar to the " Benlum sp. ? mit 

 Benium dldgmocarpum Lundell verwandt " figured by Heimerl 

 in Verhandl. zool.-botan. G-esellsch. AVien, 1891, t. 5. f. 5, but is 

 comparatively a little broader. 



*17. P. Navicula, Breb. in Mem. Soc. Sc. Nat. Cherbourg, 

 vol. iv. 1856, p. 116, t. 2. f. 37. 



Long. 30 /z; lat. 11*5 /i. 



Hab. Among Trentepolilui villosa, De Toni, on trees in woods 

 round Roseau Lake, Domiuha. No. 1161. 



18. Tetmeaiorus l^vis, Balfs, Brit. Desm, p. 117, t. 21. f. 2. 

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



*19. T. granulatus, Balfs in Ann. 4' Mag. Nat. Hist. vol. xiv. 

 1811, p. 257, t. 8. f. 2 ; Brit. Desm. p. 117, t. 21. f. 2, t. 33. 

 f. 1. 



Forma minor, Nordst. Alg. Sandvic. p. 10. 



Long. 100 p ; lat. 26'5 p. 



Hab. On roadside near Roseau Lake (2700 ft.), Dominica. 

 No. 1160. 



20. Cosmariuai pseudopvramidatuai, Lund., " Desm. Suec." 

 Act. Beg. Soc. Sclent. Upsal. 1870, p. 41, t. 2. f. 18. 



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

 bank near Roseau Lake (2700 ft.), Dominica. No. 1180. 



A proportionately longer form was noticed : long. 57 p ; lat. 

 28 p ; lat. isthm. 12 p. 



21. C. quadratitai, Balfs in Ann. <$f Mag. Nat. Hist. voL xiv. 

 1844, p. 395, t. 11. f. 9. 



A small form : long. 46 p. ; lat. 26*5 p ; lat. isthm. 12 p. 



LIKN". JOTTRX. BOTAJST, VOL. XXXIV. X 



