New British Freshwater Algse. By William West. 
( 
C. promontorium sp. n. Fig. 14. 
C. parvum, lj-plo longius quam latius, profunde con- 
strictum, sinu angusto-lineari extremo ampliato ; semicellulae 
late subrectangulares, lateribus subirregulariter biundnlatis, 
undula superiore subacuta, angulis inferioribus rotundatis, 
angulis superioribus acutis, apicibus late subconvexo-truncatis, 
seriebus granulorum parvorum irregularium intra ambitum 
totum ; a vertice visae ellipticae, utroque latere medio elevatione 
parva ; a latere visae rotundo-ovatae lateribus subretusis ; pyre- 
noidibus singulis. 
Long. 22 y ; lat. 17 y ; lat. isthm. 3*5^; crass. 10*5 /x. 
Eab. Oorid Lough, Connemara, W. Ireland. 
This species approaches a Euastrum in form. 
C. subundulatum Wille, Bidrag til Kundsk. om Norges Ferskv. 
Alg., p. 27, t. i. f. 9. 
var. beanlandii var. n. Fig. 10. 
Yar. diametro 1^-lJ-plo longior, semicellulae in 
margine circiter 18-undulatae, apicibus subtruncatis 
subretusisque, marginem versus sine granulis dis- 
tinctis ; membrana punctata. 
Long. 65-85 y ; lat. 55-59 y : lat. isthm. 20 • 5-22 y ; 
crass. 33 y. 
Eab. Newsholme, E. Yorks. (J. Beanland). 
This is somewhat similar to C. speciosum Lund. var. simplex 
Nordst. (Desm. Spetsberg., p. 31, tab. vi. f. 12) but it is rather shorter 
and has no granules within the margin ; the isthmus is also much 
narrower. 
C. speciosum Lund. var. australianum Nordst. (Freshw. Alg. of 
N. Zeal, and Austr., p. 79, tab. v. fig. 9) is also somewhat similar 
(especially Nordstedt’s fig. 9 a). 
C. annulatum (Nag.) De Bary, Conj., p. 72 ; Dysphindium 
annulatum Nag., Gattung. Einz. Alg., p. Ill tab. 6, figjf. 
Forma cellulis tribus concatenatis. 
Long. 34*5-36*5 y ; lat. 14*5-15 p. Fig. 42. 
Eab. Ben Chiurn, Scotland. 
C. bipapillatum sp. n. [=0. Boeclcii Wille* bipapillatum West, 
Freshw. Alg. of W. Ireland, p. 157, pi. xxi. fig. 14]. 
Eab. Creggan Lough, Co. Mayo, Ireland. 
After further consideration this appears to be sufficiently different 
from G. Boechii Wille to be placed as a distinct species. 
C. furcatospermum sp. n. Fig. 13. 
C. parvum, paullo longius quam latius, profunde con- 
strictum, sinu lineari; semicellulae truncato-semicirculares, 
angulis inferioribus subrectangularibus, apice truncato et 
subundulato, lateribus 5-6 granulatis, seriebus 1-2 granulorum 
