ALCYONIDXE. 



35 



sub-spirally on one side only of the posterior half 

 of the stem. 



P. quadrangularis. Fig. 55, -^ n. s. ; and the tip, \ n. s. 



55 



FAMILY II. ALCYONIID.E. 



Alcyonium (Linn.). Polype-mass lobed, in- 

 crusting submerged bodies, spongy, with star-like 

 pores, from which protrude the polypes. 



A. digitatum. Fig. 56, n. s. ; and a polype, mag. 

 glomeratum. 



Sarcodictyon (Forbes). Polype-mass incrusting, 

 linear, creeping, uniting at intervals into a sort of 

 network : polypes distant, in a single row of pro- 

 minent cells. 



S. catenata. Fig. 57 ; n.s. 

 agglomerata. 



