EXPLANATION OF THE PLATES. 7 



PLATE VI. 



Fig. 4. Vaucheria ornithocephala. Fig. 5. Vaucheria aversa. 

 Fig. 6. Vaucheria polysperma. Fig. 7. Vaucheria repens. 



PLATE VIL 



Figures of Lemania torulosa after Kutzing. Fig. 1. Represents 

 the external cellular character of the filaments. Fig, 2. 

 Shows the internal, spherical, and loosely aggregated cells, 

 with some of the articulated sporules resting upon them. 

 Figs. 3, 4, and 5. Exhibit the arrangement of the beaded 

 and articulated spores within the inflated portions of the 

 filaments. Figs. 6 and 12. The branched spores separated 

 from the filament. Fig. 7. The same more highly magni- 

 fied. Figs. 8, 9, 10, and 11. Germinating spores. 



PLATE VIII. 



Figs. 1, 2. Bangia fusco-purpurea. The first figure re- 

 presents the species in its young condition, in which the 

 endochrome of the cells is homogeneous, and the second the 

 species in its fully developed form ; the endochrome having 

 become granular or parcelled out into zoospores. Fig. 3. 

 Trentepohlia pulchella. Fig. 4. Lyngbya prolifica. 



PLATE IX. 



Figs. 1 and 2. Chatophora endicevifolia. The former in its 

 natural size, the latter magnified. Figs. 3 and 4. Chceto- 

 phora elegans. Figs. 5 and 6. Ch&tophora pisiformis. 

 The latter figure copied from Berkeley, and exhibiting the 

 very rare capsular fructification. Figs. 7 and 8. Chceto- 

 phora tuberculosa. The latter figure after Kiitzing, showing 

 its capsular fructification. 



PLATE X. 



Fig. 3. Draparnaldia elonaata. Fig. 4. Draparnaldia nana. 



PLATE XL 



Fig. 1 . Draparnaldia condensata. Fig. 2. Draparnaldia tennis. 



A 4 



