482 
Transactions of the Society. 
27. C. intermedium Rails. III. Bi, E, Tli., We., Wi. VII. D., 
Gp. VIII. H. 
Var. hibernicum West. III. Mp. 
28. C. directum Arch. III. E, Mp. 
2D. C. angustatum Kiitz. III. Th. VI. N. VIII. G, R., W. 
30. C. juncidum Ralfs. I. Ep. III. Bi., Ew., Pu. VIII. G., 
II., T. (with zygospores). 
31. C. lineatum Ehrenb. I. Ep. III. Ew. IV. Ks. VI. N. 
(with zygospores). VIII. H. 
32. C. Balfsii Breb. IV. Ks. 
Var. hybridum Rabenh. III. Pu., Th. 
33. C. attenuatum Ehrenb. I. Ep. III. Ew., M., Pu., Th. VI. N. 
VIII. Tm. 
34. C. rostratum Ehrenb. General and abundant. Zygospores 
from Epping Forest, Essex ; Esher West-end, Mitcham, Put- 
tenham and Wimbledon Commons, Richmond Park and Fren- 
sliam, Surrey. 
Var. brevirostratum West. III. Ew., Wi. (with zygo- 
spores). 
35. C. setaceum Ehrenb. I IT. Pu., Th. (with zygospores). 
VIII. G. 
36. a Kiitzingii Breb. I. Ep. III. Ew., FI, M, Mp., Ra„ Rp. 
V. Go. (with zygospores). VI. N. VIII. L. 
37. C. Cornu Ehrenb. I. Ep. II. Ru. III. M. IV. Ks. V. Go. 
VIII. G„ II., L„ T. 
38. C. gracile Breb. I. Ep. III. E., Ew., Pu, Th. V. Go. 
(with zygospores.) VI. N. (with zygospores). VII. D. 
VIII. G. 
39. C. pronum Breb. I. Ep. VI. N. VIII. K. 
A form of this was noticed with the membrane colourless and 
without any trace of striation. There were ten pyrenoids in each semi- 
cell. Long. 375 ya; lat. 9 ya. HI. Rp. 
40. C. acutum (Lyngb.) Breb. I. Ep. II. Ru. Ill .Fh, M, 
Wa, Wi. V. Go. (with zygospores). VIII. W. 
41. C. linea Perty. I. Ep. III. Bi, Dj, E, Ew, M, Mp, Rp, 
Th. IV. Ks. VIII. W. 
42. C. Ceratium Perty. III. E, Wi. 
Genus Locidium Breb. 
1. D . baculum Breb. VI. N. 
Genus Pleurotasnium Nag. 
1. P. coronatum (Breb.) Rabenh. III. Th. VI. N. 
Var. noduiosum (Breb.) West. III. E, Th. VI. N. 
VIII. W. 
