Freshwater Algse of S. of England. By W. & G. S. West. 491 
This variety is of the same dimensions as the typical form, and 
has the same arrangement of granules, but the outward form of the 
semi-cells is characteristically subrectangular. At first we considered 
it might be a large variety of C. triplication Wolle; but on comparison 
with specimens of that species, we found that, although the form was 
the same, yet the English plant was of larger size, and the arrange- 
ment of the granules was quite different (but like that in G. Unger ia- 
num). 
98. C. coelatum Ealfs. I. Ep. IV. Ks. VII. Gp. 
99. C. commissurale Breb. II. Ha. 
100. C. ornatum Ealfs. III. Mp., Th. (with zygospores). VI. N. 
(with zygospores). VII. D. VIII. G., H., L. 
101. G. cristatum Ealfs. III. Th. 
102. G. speciosum Lund. I. Ep. 
103. C. isthmium West. III. Pu. 
104. G. or biculatum Ealfs. Ilf. Bi. VI. N. 
105. C. contr actum Kirchn. III. Pu. 
10G. C. ellipsoideum Elfv. III. Th. 
* Var. minus Eacib. III. Th. 
Long. 18 y ; lat. 13*5 y. 
107. G. arctoum Nordst. VI. N. 
A small and rather irregular form. Long. 14 /x ; lat. 19*5 y ; 
lat. isthm. 7 y ; crass. 7 * 5 y. 
108. G. pseudarctoum Nordst. III. Ew. 
*109. G. subarctoum (Lagerh.) Eacib. III. Ew. 
Long. 15-17 y ; 'lat. 13*5 y ; lat. isthm. 8'5 y; crass. 
8*5 y. 
110. C. globosum Buln. VII. D., abundant. 
*Var. minus Hansg. I. Ep. 
This was in great abundance, and most nearly approaches the 
form figured by Nordstedt in Ofvers. K. Vet.-Akad. Forh., 1872, 
No. 6, t. vii. f. 25 ; and as Iiansgirg includes Nordstedt’s form in his 
variety, we place it under this variety. It is smaller than the 
typical form, with depressed apices similar to those of G. pseudarc- 
toum , but the constriction is different from that in the latter species, 
and the vertical view is elliptical. 
Long. 17-20 y; lat. 13-14*5 y; lat. isthm. 9*5^; 
crass. 9 y. 
111. G. moniliforme (Turp.) Ealfs. III. B., E., Th. VII. D. 
VIII. G., E, W. 
A form of this was observed from the New Forest with obovate 
semi-cells and subtruncate apices ; long. 41 y ; lat. 20 y\ lat. isthm. 
7 y. Many examples were seen, and they constantly retained the 
same characters. 
Forma panduriformis Heimerl. III. Th. VIII. W. 
