PLATE I. 1 
Crisia. 
Diam. Page 
Figures 1, 2. — Crisia biciliata, natural size, .... 3 
la, front ; lb, back; lc, ooecium ; 2a, side view, x 50 
„ 3. — Crisia elongata, . . . . . 5 
3a, part of the zoarium, front view, . . x 25 
,, A.-— Crisia denticulata, var. gracilis, .... 5 
4a, part of the zoarium, front and back ; 4 b, 
ooecium ; 4c, occasional mode of attachment 
to a sponge spicule ; 4 d, terminal process, . x 25 
1 A scale in millimetres is marked near the lower right-hand comer of Plates I. -VIII., which applies to all the 
figures on each, except where a different scale is marked. 
