POLYZOA. 



1. With a thin sessile cup-like base. 



T. patina. Fig. 1 ; n.s. 

 hispida. 



2. With a lengthened or thickened base. 



T. penicillata. 

 truncata. 



3. Lobed, with an unmargined base. 



T. lobulata. 

 phalangea. 

 flabellaris. 



T. serpens. 

 hyalina. 



Diastopora (Lamx.). Encrusting, undefined ; cells 

 alternating, tubular, horizontal, immersed, with a 

 raised circular orifice. 



D. obelia. Fig. 2 ; n.s. and mag. 



Idmonea (Lamx.). Divided dichotomously, erect ; 

 cells only on one side, tubular, in transverse rows, 

 divided into two sets by a medial longitudinal line. 



I. atlantica. Fig. 3 ; n.s. and mag. 



Pmtulipora (De Blainv.). Erect, cylindrical; 

 cells semi-immersed, opening all round, with a 

 prominent orifice. 



P. proboscidea. Fig. 4 ; n.s. and mag. 

 deflexa. 



