FRESHWATER ALGE OF THE WEST INDIES. 287 
*38. Scrronema Hormanni, Agardh, Syn. Algar. Scand. 
1817, p. 117 ; Born. et Flah., “ Revis. des Nostoc. Hétérocyst.," 
Ann. des Sci. Nat. 7° ser. Bot. vol. v. (1887) p. 97.—Scytonema 
Julianum, Menegh. 
The filaments, whieh were not inerusted with lime, were 
strongly agglutinated together in vertical tufts about 2 to 4 mm. 
high, in the manner of a Symploca or some species of Schizothrix. 
The sheath was perfectly colourless and very thin; the branches 
were very scarce and sometimes single. The cells were more 
often longer than broad, and varied from subquadrate to twice 
longer than their diameter. 
Crass. fil. 95-10°5 u; crass. trich. 7-75 p. 
Hab. Head of Castle Bruce River, Dominica. No. 1484. 
39. S. AMPLUM, West, “ Alg. West Indies,” Journ. Linn. Koc., 
Bot. vol. xxx. (1894) p. 270. 
Hab. On rocks, Castle Bruce River (2000-3000 ft.), Dominica. 
No. 1697. 
40. S. MIRABILE.—Conferva mirabilis, Dillw. Scytonema 
figuratum, Agardh, Syst. Algar. p. 38. S. ealotrichoides, Kuetz. 
Spec. Algar. p 207: Tab. Phye. ii. p. 6, t. 22. f. ii.; Kabenh. 
Flor. Europ. Algar. ii. p. 253. 
Crass. fil. 20-23 u ; crass. trich. 7°5-9°5 u. 
Hab. On rocks, Hampstead Valley (850 ft.) Dominica. 
No. 2171. 
#41. TOLYPOTHRIX ByssoIDEA, West d G. S. West, * Welw. 
Afric. Freshw. Alg.,” Journ. Bot. xxxv. 1897, p. 267.—Hassallia 
byssoidea, Hass. Brit. Freshw. Alg. i. p. 233-4; ii. t. 67. f.5; 
Born. et Flah., * Revis. des Nostoc. Hétérocyst.," Ann. Sci. Nat. 
7* sér. vol. v. (1887) p. 116. 
Crass. fil. 16:5-18 p ; crass. trich. 10°5-12°5 p. 
Hab. On leaves, Wotten Waven, Dominica. No. 1240. 
Although the form seen occurred on the leaves of trees, it 
agreed with the f. saxicola, Grunow (in Born. et Flah. J. c. 
p. 117) and not with the f. lignicola, Born. et Flah. The sheaths 
of the younger filaments were almost colourless, and those of the 
older filaments were somewhat rough on the exterior. The cells 
‘in some of the filaments were almost as long as broad. 
