282 messbs. w. a>:d g. s. "west on the 



Crass, cell, veget. 36-41 /z; long, zygosp. 90-104^; lat. 

 zygosp. 57-61 fi. 



Hah. On bank at roadside, Emsol, near Eoseau, 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 geuus from Spirogyra. 



Earn. Desmidiace^e. 



*10. Gonatoztgon" Ralfsii, De Bary, Conj. p. 76-7, t. 4. 

 ff. 23-25. 



Long. cell. 224 f i ; lat. 125 f i. 



Hah. Head of Castle Bruce Eiver, Dominica. No. 1484. 



*11. Mesot^niitmEndlicheriaxc^i, Nag. Gattung. einz. Alg. 

 1849, p. 109, t. vi. b. 



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



*12. M. Kramstat, Lemmermann, " Zur AJgenfl. des Riesen- 

 gebirges" Forschungsberichte aus der Biol. Stat, zn Plon. iv. 

 1896, pp. 115-117, c. fig. 



Var. brevis, var. nov. 



Yar. cellulis angustioribus brevioribusque. 



Long. 25-34-5 ^ ; lat. 6-5-7 fi. 



Hah. On bank, Morne Micotrin, Dominica. No. 1109. 



13. M. hicrococcum, Kirchn. Alg. Seliles. p. 134. Palmogloea 

 micrococca, Kuclz. Tab. p/igcolog. i. p. 20, t. 25. f. 5. 

 Long. 17-18 fi ; lat. 8-8'5 fi. 

 Bab. On bank, road to Lake, Dominica (2700 ft.). No. 1222. 



*14. Cylindrocystis tumida, F. Gay, ' Essai monogr. loc. 

 Conj.,' Montpellier, L884, p. 52, t. 1. f. 1 ; " JSote Conj. du midi 

 France" Bull. iSoc. bot. Fr. vol. xxxi. p. 334. 



Var. bominicensis, var. nov. 



Var. cellulis multe minoribus, diametro 2-2]-plo longioribus, 

 ad medium leviter soil distincte constrictis. 



Long. 425-48 /u ; lat. 20-21 p. 



Hub. On rocke, Castle Bruce Eiver (2000-3000 ft.), Domiuica. 

 No. 1697. 



