B-4 



Aoanella arbusoula and Chrysogorgia agassizii . 



The Pennatulaceans are highly modified octocorals. They 

 develop from greatly enlarged primary polyps which serve as the 

 structural foundation of the colony. The lower part of the pri- 

 mary polyp is modified into a stalk which anchors the colony in 

 soft substrates. On its upper part, which is called the rachis, 

 are a variable number of dimorphic secondary polyps. This arrange- 

 ment of secondary polyps on the rachis is a taxonomic character 

 used to differentiate pennatulaceans at the genus and family level. 

 While the small siphonozooids are usually distributed irregularly 

 on the rachis, the autozooids are often placed in a symmetrical 

 radial or bilateral pattern. Although all seapens are unbranched, 

 in the family Pennatulidae there is a series of long narrow 

 extensions of the rachis extending out on either side (containing 

 autozooids) and giving the colony the appearance of being pinnately 

 branched. Two species of this family (genus Pennatula) occur in 

 deep water off the northeast coast along with single species of the 

 genera Baltioina^ Kophobelemnon^ Anthoptilum^ Distichoptilum 

 and Stylatula. 



ALCYONACEANS 



Anthomastus grandif torus (Verrill) 



Anthomastus gvandi f torus , Verrill, 1878b:376; 1883:41; 1922;40 

 Anthomastus grandiftorus , Deichmann, 1936:52 



