54 fXELENTERATA AND 



I. Solitary, not attached 1 .... Pennatulacea. 



II. Attached. 



a. With axis Gorgonacea. 



b. Without horny axis . . . Alcyonacea. 

 Body with circular base with calcareous septa. No ring- 

 shaped Avail. Six peripheral tooth-like extensions of cal- 

 careous septa. Septa large and small, alternating in two 

 or more series. Each septa with lateral ridges. Unat- 

 tached. Lower surface ribbed. Deep water. 



Deltocyathus. 



Body horn-shaped, prolonged to a posterior projec- 

 tion. Two axes of different lengths. Peripheral wall. 

 Large prominent septa which rise above the upper surface ; 

 no centrifugal peripheral teeth. One series of septa. 



Flabellum Goodei. 



Alcyonoida. 



Compound corals with eight pectinate or branched ten- 

 tacles. With or without sclerobase. When sclerobase is 

 present, horny, calcareous or siliceous. With a cortical 

 layer formed of consolidated or scattered spicules. 



Pennatulacea. Free or with base buried in sand, pen- 

 shaped, composed of an axis and leaf portion. With spic- 

 ules. Sclerobase small flexible rod. Polyps on edge of 

 leaf. Zooids small on axis. 



Gorgonacea. Rooted, plant-like, branching. With 

 horny or siliceous sclerobase or loosely consolidated spic- 

 ules in axis. Cortical layer present or absent in dry 

 specimens. 



Alcyonacea. Attached, fleshy, with scattered spicules. 

 Massive, colonial. Without sclerobase. 



'Deep water; not strictly belonging in this paper. 



