PLATE 1/ 



Crisia. 



Figures 1, 2. — Crisia biciliata, natural size, 



la, front ; lb, back ; Ic, ocecium ; 2a, side view 



„ 3. — Crisia elongata, .... 



3a, part of the zoarium, front view, 



„ 4. — Crisia denticulata, var. gracilis, 



4a, part of the zoarium, front and back ; Ah 

 ocBcium ; 4c, occasional mode of attachment 

 to a sponge spicule ; Ad, terminal process. 



Diam. Page 

 3 



50 



X 25 



25 



1 A scale in millimetres is marked near the lower right-hand corner of Plates I. -VIII., which applies to all the 

 figures on each, except where a different scale is marked. 



