the Cystocarp in Rhodomelaceae. 
305 
EXPLANATION OF FIGURES IN PLATE X. 
Illustrating Professor Phillips’ paper on the Development of the 
Cystocarp in Rhodomelaceae. 
Figs. 1, 2, 3, 4. Rhodomela subfusca, fresh material. 
Figs. 5, 6. Polysiphonia violacea , alcohol and glycerine. 
Figs. 7, 8, 10, 11, 12. Polysiphonia nigrescens, alcohol and glycerine. 
Fig. 9. Polysiphonia fasligiata i alcohol and glycerine. 
Abbreviations: aux. c. auxiliary cell; c. c. central cell; cp . br. carpogonial 
branch ; carp, carpogonium ; cpsp. carpospore ; conj. in. mass resulting from 
conjugation ; in. st. br. inferior sterile branch ; /. si. br. lateral sterile branch ; 
pc. c. pericentral cell ; pep. pericarp ; pn. paranema ; st. br. sterile branches ; 
tr. trichogyne. 
Fig. 1. x8oo. Surface view of unfertilized procarp, showing the bivalve character. 
Fig. 2. x8oo. Median view of unfertilized procarp, showing the carpogonial 
branch shaded black, and the sterile branches shaded red. 
Fig. 3. x 1200. Median view of contents of procarp, just after fertilization. The 
sterile branches have developed and the auxiliary cell divided. No 
spores are yet formed. 
Fig. 4. x6oo. The cystocarp after spore-formation. The spores are seen to 
radiate from the sporogenous cell. The sterile branches are intact. 
The carpogonial branch, from which the carpogonium has disappeared, 
is shunted near the pore. 
Fig. 5. x8oo. Median view of unfertilized procarp from behind. The lateral 
position of the carpogonial branchy is seen, with a sterile branch facing 
it. The trichogyne is bent where it leaves the procarp. 
Fig. 6. x8oo. Contents of procarp somewhat later than Fig. 3. Spores are seen 
arising from the sporogenous cell. 
Fig. 7. x 800. Median view of procarp just after fertilization, showing origin of 
the paranemata. 
Fig. 8. x 400. Median view of a nearly mature cystocarp, showing development 
of paranemata. 
Fig. 9. x 800. Lateral view of the product of one of the two cells giving rise to 
the paranemata (dotted). The auxiliary cell, sporogenous cell, and 
carpogonial branch are shown. The sterile branches and spores are 
omitted. 
Fig. 10. x 800. Surface view of procarp, showing the origin of one of the valves 
of the pericarp in a single pericentral cell. 
Figs. 11 and 12. Masses squeezed out from nearly mature cystocarps, showing pit- 
connexions with sporiferous filaments. 
Figs. 13 and 14. Diagrammatic representations of the contents of a procarp before 
and after fertilization respectively. 
