ON THE FRESHWATER ALGE OF THE WEST INDIES. 279 
shorter and much less deeply bifid than in C. rhynchophysa. 
lt also appears to be rather more slender than in that species. 
I therefore venture to contend that C. rhynchophysa of Fisch., 
Mey. & Avé-Lall. Ind. Sem. Hort. Petrop. ix. Suppl. 9, is still 
a desideratum to the flora of Great Britain and Ireland. 
A further Contribution ip the Freshwater Ales of the West 
Indies. By W. West, F.L.S., and G. S. West, B.A., 
A.R.C.S. 
[Read 16th March, 1899.] 
Tur Alge included in this paper were collected mainly in the 
Island of Dominica by Mr. W. R. Elliott in January and Feb- 
ruary, 1896, and consisted of dried specimens, numbered and 
localized. The numbers following the localities refer to the 
numbered sheets at the British Museum, at which place the 
specimens can be consulted. 
In 1894 we published a short paper * On some Freshwater 
Alg from the West Indies" (Journ. Linn. Soe., Bot. vol. xxx.), 
in which 63 species were recorded from the islands of Dominica 
and St. Vincent, and the present paper considerably enlarges 
our knowledge of West Indian species of these plants. Of the 
63 species mentioned in the previous paper, 21 have been found 
in other localities, and 66 additional ones are recorded, the latter 
being prefixed by an asterisk (*). One species (Rhaphidium 
Jractum) and two varieties (Mesotenium Kramstai, Lemmerm., 
var. brevis, and Cylindrocystis tumida, F. Gay, var. domini- 
censis) are described as new. One alga, Lyngbya majuscula, 
Harv., is truly a marine species, but it was found in the collec- 
tion, and 1s therefore recorded. 
A number of both Desmids and Diatoms were noted from 
subaérial habitats—a sure indication of a constantly moist 
atmosphere; these occurred chiefly among patches of Scytonema, 
Schizothriz, and other filamentous alge, and often on trees. 
In the measurements given of the Myxophycee in this paper, 
“crass. fil.” =the diameter of the sheath containing the tri- 
chomes, and “ crass. trich." =the diameter of the cells without 
the sheath. 
