or Little Known, Polyzoa. 293 



punctate. The mouth is circular and entire, and the part of 

 the cell (peristome) immediately below it is smooth or with 

 obscure transverse wrinkles. In many of the fasciculi the 

 cells all end at the same level, are closely packed together, 

 and have prismatic orifices. This is generally owing to the 

 free portions of the cells being broken off. 



EXPLANATION OF FIGURES. 



Plate I. 



Fig. 1. Hornera rohusta. 

 Fig. 2. Fasciculipora gracilis. 



Fig. 3. Pustulopora regularise natural size. Fig. 3a. Portion of 

 same magnified. 



Plate II. 



Fig. 4. Retepora serrata. 



Fig. 5. R. aurantiaca. Young cells, showing oral spines. Fig. 



5a. Older cell and ovicells. 

 Fig. 6. R. avicularis. Fig. 6a. Avicularium in profile. 

 Fig. 7. R. granulata. 

 Fig. 8. R.fissa. 



Fig. 9. R. porcellana. Group of cells from old, worn specimen. 

 Fig. 10. Young cells from the growing edge. Figs. 10a, 6, and c. 



Other cells, from the same specimen as 10. 



