168 NEMATOPHYCER. 
Vesiculifera Boscii, Hassall Alge t. 52, f. 3, 4, 5. 
Prolifera Boscii, Le Clere Prolif. 474, t. 23, f. 5. 
Vesiculifera elegans, Hass. Ann. Nat. Hist. 
England. 
Plate LXIII. fg.4. Cidogonium Boscii, with oogonia x 400. 
Gdogonium tumidulum. Kutz. Dec. Alg. No. 60. 
Oogonia single, ellipsoid egg-shaped, opening by a pore above 
the middle, almost filling the oogonium; male plants a little 
slenderer than the female; spermogonia 6-45 celled ; sperma- 
tozoids binate. 
Size. Cells: fem. -018--025 mm. 34-5 times as long ; 
cells: male -015-"018 mm. 4 times as long; oogonia -056--058 
x ‘078-09 mm.; oospore :049--054 x :061-:068 mm.; sperm. 
cell -015--017 x :009--012 mm. 
Wittr. Mon. Gidog. p. 35. Kirch. Alg. Schles. p. 58 (not 
of Pringsheim). 
Treland. 
Plate LXIII. fig. 5. Cdogonium tumidulum with “oogonium. 5 a, 
portion of male plant with spermogonia x 400. 
Cdogonium Landsboroughii (Hass). Wittr. Mon. Edog. p. 35. 
Oogonia single, rarely twin, obversely egg-shaped, opening 
by a pore above the middle; oospores obversely egg-shaped, 
filling the oogonia (or rarely ellipsoid and not filling the 
oogonia) ; male plants a little slenderer than the female; sper- 
mogonia 5-25 celled; spermatozoids binate, with a vertical 
division ; terminal cell ubtuse. 
Size. Cells: fem. -033--036 mm. 4-6 times as long: cells: 
male -031--033 mm. 4-6 times as long; oogonia ‘063-:075 x 
‘1-12 mm.; oospore ‘057-07 x ‘075-1 mm.; sperm. cell 
*027--08 x 009-012 mm. 
Kirch. Alg. Schles. p. 58. 
dogonium rivulare, Rabh. Alg. iii. p. 350, in part. 
Vesiculifera Landsboroughii, Hassall, F. W. Alge t. 51, f. 2. 
Gdogonium gemelliparum, Hantsch, Rab, Alg. Eur. 1118. 
(Edogonium gemelliparum v. major, Wittr. Disp. Cidog. p. 
187. 
Britain. 
Plate LX1V. fig. 1. Cdogonium Landsboroughii, with oogonia and 
oospores x 400. 
var B. gemelliparum (Prings). Wittr. Mon. Edog. p. 36. 
Smaller than the typical form. Oogonia egg-shaped; oospores 
filling the oogonia ; terminal cell very long, somewhat hyaline. 
