PLATE LI I. 



FIG. 



1. Palmicellakia Skenki, p. 379; var. ^ (foliacea), 



about nat. size ; from a beautiful specimeu in the 

 possession of Dr. M'lntosh. 



2.  , usual form, nat. size. 



3. , zocecia. 



3 (^ . . ^ zooecium, showing position of the avicu- 



larium. 



4, , form BicoRNis. 



5, 6. Palmicellakia lorea, p. 382 ; nat. size, and zocecia 

 magnified. 



7. Cellepora ramulosa, p. 401; slightly above nat. size. 



8. ■, zocecia. 



9 ^ a single cell, showing the spur at the 



base of the rostrum. 



