156 NEMATOPHYCEZ, 
Wittr. Mon. Gdog., p. 18. Kirch, Alg. Schles, p. 52. Rabh. 
Alg. Eur, iii., 849, in part. 
Prolifera Vaucherii, Le Clere sur, Prolif. 474, t. 24, f. 4? 
Vesiculifera Vaucherii, Hassall, t 50, f. 4. 
Britain. 
Plate LVIII. fig. 8. Cdogonium Vaucherii, with oogonia and 
spermogonia x 400. 
Cdogonium urbicum. Witir. Mon. Edog. p. 13. 
Oogonia single, ellipsoid, opening by a pore above the 
middle, oospores globose, not filling the oogonium, spermogonia 
usually 2 celled, spermatozoids binate, supporting cells destitute 
of chlorophyll. 
Size. Cells -016 mm. by 23, 6 times as long; oospore 
088-045 x -033--045 mm. 
Kirch. Alg. Schles. p. 52. 
dogonium tumidulum, Prings. Beitr., p. 69, t. 5, f. 2 (not 
Kutzing). Micr. Journ, 1866, p. 69. 
Gdogonium Vaucherii, in Rabh, Alg. Eur. iii., 349, in part. 
Treland. 
Plate LIX. fig.1. Cidogonium urbicum, with oogonium and spermo- 
gonia x 400. 
b. Oospores ellipsoid or egg-shaped. 
Gdogonium paludosum. (Hass.) Wittr. Mon. Edog. p. 14. 
Oogonia single, ellipsoid, usually rather oblique, opening by 
a pore above the middle; oospores ellipsoid, distinctly filling 
the oogonium (membrane of the oospore, when mature, longi- 
tudinally costate ?); spermogonia I-8 celled, scattered, usually 
situate in the upper portion of the filament; spermatozoids 
binate, often born with an oblique division. 
Size. Cells -015-'02 mm. by 3-7 times as long; oogonia 
039-048 x ‘066-084 mm. ; oospore ‘036-045 x 054-063 
mm. ; sperm. cell ‘014-016 x :006--013 mm. 
Vesiculifera paludosa, Hass. F. W. Alg. p. 199, t. 52, f. 8? 
England. 
Plate LIX. fig.2. Cidogonium paludosum with oogonium and spermo- 
gonia x 400. 
B. Oogonia furnished with verticillate median processes, 
a. Oospores subglobose. 
Gdogonium Itzigsohnii. D’Bary Edog. p. 56, t. 3, f. 29-32. 
Oogonia single, ellipsoid, median processes 7-10, obtusely 
conical, oogonia splitting round below the middle, opening by a 
