286 _ THE JOURNAL OF BOTANY 
his species is nearest to C. /utifrons Lund., but is only about 
half the size, wheal ounder angles, fewer granules, and a different 
central nm 
29. 0. » EME Nordst. var. BARBADENSE var. n. (Fig. 17.) Var 
pings, Seiniosltabs subtrapezoideis, marginibus lateralibus leviter 
vexis, apice latiori. Long. 7°8-7:7 »; lat. 7-4-8 yp; lat. is: m 
13 »; crass. cum papill. 5:4 ». Barbados.—Near Bridgetow 
This minute Cosmarium differs from typical C. bireme anise in 
me somewhat smaller size, in the absence of the lateral angles, and 
n the wider x goes of the semicells. There is one pyrenoid in 
oath chloroplast 
It should be compared with C. bireme var. ence & 
aby Vert On Rrans. Linn. Soc. (Bot.) ser. 2, v. 1895, p. 5 6, t. 6, 
f. 87), from which it is distinguished by its smaller size, ne pro- 
portionately greater breadth, and its ee linear, closed sinus. 
mpare also with C. ocuwh W. & G. S. West in Journ. Roy. 
Miér. Soc. 1897, p. 487, t. 7, £. 24. 
30. C. Cucursita Bréb. var. arreNuAtuM nob. ee 
Cucurbita (Bréb.) Hansg., ‘‘ forma ad apices versus attenuata 1bique 
late rotundato- truncata,,’? Schmidle in nf botan. Zeitsch?. 1895, 
p. 947, ¢. 14, £16.) Long, 24°87 js late 52-17 »; lat. apic. 
circ. 10-11°5 »; lat. isthm. 14-165 p. Trinidad. —Pools on the 
Pitch rime se Brea, (Fig. 18. 
This ety is somewhat smaller shari typical C. C ucurbita, and 
the semicel are distinctly attenuated towards their apices. 
. C. pseuparcroum Nordst. Long. 154-19 p; lat. 10°5-11°5 p; 
iat. sails 9°5_10 p. Trinidad.—Pools on the Pitch Lake. 
382. SponpyLosiuM oop edie (Borge) nob. oe ae re 
desmidiiforme ij Aig. . Regn. Exped.,” Arkiv ) 
utgifv. a kath Ba. 1, 1908, p. 120, t. B, L 23.) 
pig cell. S812 er 25-29 p; lat. cite 23-25 p; crass. 
so —, as “amis by Borge. In many cells the F sicsl view 
asymmetrical (vide fig. 180, 6’), and the cell-wall in 
the esnit ‘of the lateral margins is delicately and sparsely 
punctate. 
This Desmid sae almost equally well be placed in the section 
Didymopriun, of the genus Desmidium. Borge describes the pre- 
us aevelopet round the filaments, but there was no 
=< Ay such a ies investment in the Trinidad specimens. 
. SraurastRUm TURGEscENS De Not. Long. 83-36°5 p; lat. 
98-81. 5 p; lat. isthm. 10-12p. Barbados. —Graeme Hall Swamp. 
34. Cuaractum Sresotpu A. Br. Long. cell, 15°5-25 p; lat. 
cell. 4°2-9°5 wp. Barbados pie Hall Swamp ; ; epiphytic on 
Nitzschia spectabilis. 
