New British Freshwater Algse. By W. and G. S. West. 155 
West, Nonn. Alg. Aquae dulc. Lusitan., Notarisia, 1892, 
p. 1502). Pl. IV. fig. 35. 
We noticed tlie occurrence of the zygospores in the above paper, 
but no figure was given. 
Zygosporae globosae, spinis brevibus nuinerosis truncate 
bifidisve ornatae. 
Diam. zygosp. sine spin. 31 /x ; c. spin. 41 ya. 
Hab. Lepa, Portugal. 
18. C. pseudoprotuberans Kirchn. (Alg. Scbles., p. 150 ; Nordsh 
Desm. Gronl., taf. vii. fig. 3). PI. IY. fig. 34. 
Zygosporae globosae, glabrae. 
Diam. zygosp. 30 ya. 
Hab. Thursley Common, Surrey. 
19. C. Begnesii Reinscb. (Algeufi. von Franken, p. 112, t. viii. 
f. 8 ; W. and G-. S. West, Freshw. Alg. of Madagascar, Trans. 
Linn. Soc., 1895, vol. v. pt. 2, pl. vi. fig. 44). PI. III. figs. 
30, 31. 
Zygosporae plerumque rhomboides, lateribus leviter concavis, 
interdum rotund o-quadratae vel pentagonae ; membrana luteo- 
fuscescente. 
Long, zygosp. 15-19 //,, lat. 11*5-13 y,. 
Hab. Thursley Common, Surrey. 
These zygospores were numerous in a gathering of desmids from 
Utricularia minor ; they were occasionally enveloped in a gelatinous 
matrix. 
20. C. lusitanicum West (Nonn. Alg. Aq. dulc. Lusitanicae, 
Notarisia, 1892, p. 1502). Pl. IY. fig. 38. This was pub- 
lished in the above journal without a figure. 
C. mediocre, diametro circiter lj-plo longius, prolunde 
constrictum, sinu sublineari ; semicellube granulatae, breviter 
subpyramidatae, subtruncatae ad apicem, angulis superioribus 
et inferioribus rotundatis ; granulis conicis in seriebus sub- 
transversis et subconcentricis ordinatis, granulis minoribus ad 
apices; a vertice visae ellipticae, medio subtumidae; a latere 
visae subrotundatae utrobique, ad medio leviter subtumidae. 
Zygosporae globosae, spinis attenuatis, delicatulis, longis, ad 
apices breviter bifidis trifidisve ornatae. 
Long. 45-46 ya ; lat. 36-37 y ; lat. isthrn. 13 ya ; crass. 
25 ya ; diam. zygosp. s. spin. 35-36 ya, c. spin. 61- 
< 67 ya. 
Differt a C. confuso Cooke et var. regulariore Nordst. 
praecipue cellulis angustioribus et apicibus subgranulatis, etiam 
angulis inferioribus semicellularum rotundatis et granulis 
numerosioribus. 
Hab. Lepa, Portugal. 
