282 MESSRS. W. AND G. 8. WEST ON THE 
Crass. cell. veget. 36-41 p: long. zygosp. 90-104 p; lat. 
zygosp. 57-61 u. 
Hab. On bank at roadside, Emsol, near Roseau, Dominica. 
No. 983. | 
Gray’s description of Choaspis is a very good one of the plant, 
and is twenty-two years previous to Kuetzing’s description of 
Sirogonium. We think that the peculiar conjugation sufficiently 
separates this genus from Spirogyra. 
Fam. DEsSMIDIACEZR. 
*10. GONATOZYGON RALFSII, De Bary, Conj. p. 76-7, t. 4. 
ff. 23- 25. 
Long. cell. 224 u; lat. 1275 pe. 
Hab. Head of Castle Bruce River, Dominica. No. 1484. 
*11. MESOTÆNIUM ENDLICHERIANUM, Ndg. Gattung. einz. Alg. 
1849, p. 109, t. vi. B. 
Hab. On banks, Morne Micotrin, Dominica. No. 1109. 
#19. M. Kramstrat, Lemmermann, ** Zur Algenfl. des Riesen- 
gebirges,”” Forschungsberichte aus der Bioi. Stat. zu Plön. iv. 
1896, pp. 115-117, e. fig. 
Var. BREVIS, var. nov. 
Var. cellulis angustioribus brevioribusque. 
Long. 25-345 p; lat. 6°5-7 p. 
Hab. On bank, Morne Micotrin, Dominica. No. 1109. 
13. M. mrcrococcum, Kirchn. Alg. Schles. p. 134.— Palmoglea 
mierococca, Kuetz. Tab. phycolog. 1. p. 20, t. 25. f. 5. 
Long. 17-18 a ; lat. 8-85 p. 
Hab. On bank, road to Lake, Dominica (2700 ft.). No. 1222. 
*14. CYLINDROCYSTIS TUMIDA, F. Gay, ‘ Essai monogr. loc. 
Conj. Montpellier, 1884, p. 52, t. 1. f. 1; “ Note Conj. du midi 
France," Bull. Soc. bot. Fr. vol. xxxi. p. 334. 
Var. DOMINICENSIS, var. nov. 
Var. cellulis multe minoribus, diametro 2-2j-plo longioribus, 
ad medium leviter sed distinete constrictis. 
Long. 42:5-48 u; lat. 20-21 p. 
Hab. On rocks, Castle Bruce River (2000-3000 ft.), Dominica. 
No. 1697. 
