West & West. — Observations on the Conjugatae. 57 
Fig. 37. Hyalotheca dissiliens (Sm.), Breb. A peculiarly conjugated example 
from Thursley Common, Surrey, x 250. 
Fig* 38* Euastrum binale (Turp.), Ehrenb. Showing tendency to assume 
a filamentous condition; from Thursley Common, Surrey, x 250. 
Fig. 39. Euastrum didelta (Turp.), Ralfs. Specimen from Wrynose, Lake 
District, abnormally divided. X 220. 
Fig. 40. Tetmemorus granulatus (Breb.), Ralfs. Specimen from the New Forest, 
Hants, one semi-cell branched, x 250. 
Fig. 41. Mougeotia sp. Showing branching; from near Lindley Reservoir, 
W. Yorks, x 250. 
Fig. 42. Mougeotia uberosperma , West and G. S. West. With immature 
spores, x 520. 
Fig. 43. Mougeotia uberosperma, West and G. S. West. With mature spores, 
x 520. 
Fig. 44. Mougeotia parvula , Hass. From Black Hill, near Settle, W. Yorks, 
x 520. 
Fig. 45. Mougeotia recurva (Hass.), DeToni. Three cells conjugating together ; 
from Borrowdale, Lake District. x 520. 
Fig. 46. Mougeotia angolensis , West and G. S. West. From Pungo Andongo, 
Angola, W. Africa, x 250. 
Fig. 47. Mougeotia nummuloides, Hass. From Scarf Gap Pass, Lake District. 
X 250. 
Fig. 48. Mougeotia capucina (Bory.), Ag. Example from New Forest, Hants, 
with two carpospores. x 250. 
PLATE V. 
Figs. 49-52. Temnogametum heterosporum, West and G. S. West. From 
Huilla, Angola, W. Africa, x 250. 
Figs. 53, 54. Pyxispora mirabilis zst and G. S. West. From Huilla, Angola, 
W. Africa, x 520. 
Fig. 55. A hybrid specimen from Strensall Common, N. Yorks. ; conjugation 
taking place between two species of Mougeotia. x 400. 
Figs. 56, 57. Mougeotia irregularis , West and G. S. West. From Pungo 
Andongo, Angola, W. Africa, x 350. 
Fig. 58. Debarya laevis (Kutz.), West and G. S. West. Peculiarly conjugated 
example from Mitcham Common, Surrey, x 220. 
Fig. 59. Debarya laevis. Mature zygospore showing the scrobiculations. x 520. 
Figs. 60, 61. Zygnema spontarieum , Nordst. Mature zygospores produced by 
scalariform conjugation ; specimens from Huilla, Angola, W. Africa, x 520. 
Figs. 62,63. Zygnema pectinatum (Vauch.), Kutz. 62, x 120; 63, x 220. 
Fig. 64. Spirogyra condensata (Vauch.), Kutz. x 120. 
Fig. 65. Zygnema pectinatum (Vauch.), Kutz. x 120. 
Fig. 66. Spirogyra maxima (Hass.), Wittr. x 100. Conjugation between 
three cells. 
Fig. 67. Spirogyra sp. From Huilla, Angola, W. Africa, x 120. 
Fig. 68. Spirogyra inflata (Vauch.), Rabenh. x 220. From Mitcham Common, 
Surrey. 
