FRESHWATER ALGA OF THE WEST INDIES. 285 
7-10-plo longioribus, apices versus plus incurvatis, apicibus 
acutis; contentum chlorophyllosum cellularum viride, in partibus 
subequalibus quatuor distincte divisum. 
Long. 19-36:5 u; lat. 2:6-3:4 u. 
Hab. In stream, Wotten Waren, Dominica. No. 1249. 
This species is nearest to Rhaphidium Braunii, Nig. (in Kuetz. 
Spee. Algar. p. 891; Rabenh. Flor. Europ. Algar. iii. p. 45), but 
the form of the cells, which are narrower, and the peculiar 
division of the eontents easily distinguish it. Some specimens 
were noticed in which the contents were divided into 3 or 5 parts, 
but these were abnormal and very scarce. 
*28. Oocystis SOLITARIA, Wittr. in Wittr. & Nordst. Alg. 
Exsic. no. 244. 
Hab. On trees in woods round Roseau Lake, Dominica. 
No. 1164. 
*29. GLÆOCYSTIS GIGAS, Lagerh. in Ofvers. af K. Vet.- Akad. 
Förh. 1883, no. 2, p. 63.—Protococeus gigas, Kuetz. Phyc. Germ. 
1845, p. 145.  Chlorococeum gigas, Grun. 
-Hab. With the preceding species. 
*30. TnocniscrA ASPERA, Hansg. in Hedwigia, 1888, Heft 5 
u. 6.—Acanthococcus aspera, Reinsch, in Berichte der Deutsch. 
bot. Gesellsch. in Berlin, 1886, p. 239, t. 11.Yf. 2. 
Diam. cell. 15-1775 p. 
Hab. In stream, Wotten Waven, Dominica. No. 1249. 
Class MYXOPHYCEA. 
Ord. HoRMOGONES. 
Sub-ord. HETEROCYSTEE. 
Fam. RIVULARIACES. . 
*31. CALOTHRIX EPIPHYTICA, West & G. S. West, “ Welw. 
Afric. Freshw. Alg.," Journ. Bot. xxxv. 1897, p. 240. 
Hab. Epiphytie on Tolypothrix byssoidea, on leaves, Wotten 
Waven, Dominica. No. 1240. 
x2 
