FRESHWATER ALGJE OF THE WEST INDIES. 283 
*15. PENIUM currum, Bréb. in Kuetz. Species Algar. 1849, 
p. 167.—Closterium curtum, Breb. 1840. Cosmarium curtum, 
Ralfs, Brit. Desm. p. 109, t. 32. f. 9. 
Hab. With the preceding species. 
*16. P. DIDYMOCARPUN, Lund., * Desm. Suec.,”, Act. Reg. Soc. 
Scient. Upsal. 1870, p. S5, t. 5. f. 9. 
Forma cellulis latioribus; long. 29 p; lat. 17 u. 
Hab. On banks, Morne Micotrin, Dominica. No. 1109. 
This form is somewhat similar to the “ Penium sp.? mit 
Penium didymocarpum Lundell verwandt" figured by Heimerl 
in Verhandl. zool.-botan. Gesellseh. Wien, 1891, t. 5. f. 5, but is 
comparatively a little broader. 
*17. P. Navrcura, Bréb. in Mém. Soc. Sc. Nat. Cherbourg, 
vol. iv. 1856, p. 146, t. 2. f. 37. 
Long. 30 a; lat. 11:5 u. 
Hab. Among Trentepohlia villosa, De Toni, on trees in woods 
round Roseau Lake, Dominica. No. 1164. 
18. Termemorus Levis, Ralfs, Brit. Desm. p. 147, t. 24. f. 2. 
Hab. On banks, Morne Micotrin, Dominica, No. 1109. 
*19. T. GRANULATUS, Ralfs in Ann. & Mag. Nat. Hist. vol. xiv. 
1844, p. 257, t. 8. f. 2; Brit. Desm. p. 147, t. 24. f. 2, t. 33, 
f. 1. 
Forma minor, Nordst. Alg. Sandvie. p. 10. 
Long. 100 H; lat. 26:5 [le 
Hab. On roadside near Roseau Lake (2700 ft), Dominica. 
No. 1160. 
20. CosMARIUM PSEUDOPYRAMIDATUM, Lund., “ Desm. Suec.” 
Act. Reg. Soc. Scient. 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 a; lat. isthm. 12 y. 
*21. C. QUADRATUM, Ralfs in Ann. 4 Mag. Nat. Hist. vol. xiv. 
1844, p. 395, t. 11. f. 9. 
A small form: long. 46 u; lat. 26°5 u; lat. isthm. 12 y. 
LINN. JOURN.—BOTANY, VOL. XXXIV. x 
