ALGEZE FROM THE WEST INDIES. 267 
This variety has the cells of the filaments often somewhat 
doliform, and closely resembles a Conferva; it does not, how- 
ever, break up in the peculiar manner of any species of Conferva 
(vide fig. 6). The binate chromatophores also put it out 
of this genus. Fig. 4 probably represents an attempt at con- 
jugation. 
Two cells are figured (fig. 5) which show an attempt at 
longitudinal division. 
Ord. DEsMIDIACESR. 
6. Mrsor#nium micrococcum, Airchn. (Alg. Schles. p. 134.) 
[Palmoglwa micrococea, Auetz. Tabule phycolog. i. p. 20, t. 25. 
f. 5.] 
Long. cell. 15°5-17°3 yw; lat. cell. 7°5-9 u. 
Hab. On trees among mosses, summit of Trois Pitons (4500 ft.), 
Dominica. Nos. 903 and 904.—On Bow-wood Hills (1580 {t.), 
St. Vincent. (8-12-91.) No. 23. 
7. M. cutamyposporuM, De Bary. (Con). p.75; Cooke, Brit. 
Desm. p. 47, pl. 18. f. 14; West, Freshw. Alg. of W. Ireland in 
Journ. Linn. Soc. vol. xxix. p. 131, pl. xxiv. f. 8.) 
Long. cell. 19-23 p; lat. cell. 12°5-14°5 p. 
Hab. On trees among mosses, summit of Trois Pitons (4500 ft.), 
Dominica. Nos. 908 and 904. 
8. TeTMeMorts La&vIs, Ralfs. (Brit. Desm. p. 147, t. 24. f. 2.) 
Long. 57°5-65 p; lat. 19-20 p; lat. isthm. 17°5-18°5 p. 
Hab. In mud, warm stream, crater of Grande Soufriere, Do- 
minica. No. 883. 
9. CosMARIUM PSEUDOPYRAMIDATUM, Lund. (Desm. Suec. 
p. 41, t. 2. £ 18.) 
Long. 46-48 p; lat. 24-25 »; lat. isthm. 9°5-12°5 p. 
Hab. Ono damp wall of dam, Sharp’s River, St. Vincent. 
No. 477. 
*sTENONOTUM, Wordst. in Wittr. et Nordst. Desm. et Edog. in 
Ital. et Tyrol, p. 32, t. xii.f.8. Forma minor, Racib. (Desmidya 
w podrozy na oklo ziemi, p. 4, t. i. f. 32). (Pl. XIV. fig. 25.) 
Long. 36-865 p; lat. 28-24; lat. isthm. 65 p53 crass. 
13°5 p. 
Hab. With the typical form, but much more abundant. 
10. C. optiguum, Nordst. (Bidrag till kdnned. om Sydligare 
t2 
