aoe 
PLATE XX. 
Figs. 1-38.—Acanthocladium huxleyi. Magnified details. 
1.—Portion of a phylactocarp with a gonangium. ‘The points from which the other 
gonangia had been detached are seen close to the bases of the costee. 
. 2.—Portion of a hydrocladium with two hydrothecz ; lateral view. 
3.—Distal extremity of a branch, showing the spine-like appendages by which the 
hydrocladia are here replaced. 
Figs. 4-6.—Aglaophenia macgillivrayt. Magnified details. 
e. 4.—Portion of a hydrocladium ; lateral view. 
Same ; front view. 
e. 6,—Corbula. 
