﻿PENNATULAKIA. H 



Synopsis of Families. 



Subsection I. Penniformes. The coral pen-shaped. The polypes 

 in transverse ridges or pinnules on each side of the ventral 

 surface of the central rachis or stem. 



Fam. 1. FxjxiCTJLiNiD^ or JrifciFOEMES. Coral elongate, linear, 

 slender. Polypes placed in transverse ridges on each side of 

 the front of the rachis. - ,^,_A-M ^ '"^ 



a. Eidge of polype-cells attached the whole length. 



* Cells armed with spicules. Funiculina, Balticina, Nortichia, 

 Scytalium. 

 ** Cells not armed. Virgularia. 

 h. Ridge with a narrow base. Lygus, StylatuJa. 



Fam. 2. Pexxatulidj?: or Pennifeea. Coral pinnate. Pinnules 

 arising from a narrow base, in a series on each side of the 

 front part of the rachis. Polypes retractile. 



a. Pinnules elongate, angular. Pennatula, Phospliorella, PtiMla, 

 Lisella, Leioptllus, Arycntella, Pteromorpha, Pteroeides. 



h. Pinnules square, fleshy. Crispella. 



(•. Pinnules semicircular, fleshy. SarcoptUus, PliUosarcus. 



Subsection II. Claviformes. The coral club-shaped or leaf-like. The 

 polypes scattered on one or on all sides of the upper part of 

 the club. 



Fam. 3. Kophobelemnokid.^ or Claviformes. The coral club- 

 shaped, with an irregular row of polj-pes only on one surface 

 of the club, the other surface sterile. Polypes not retractile. ^ 

 Kophobelemnon. ' ' 



Fam. 4. Veretillid^ or Yeeetilloids. The coral club-shaped. 

 The polypes on all sides of the club. Polypes retractile, ex- 

 panded. Lituaria, SarcobeJemnon, Cavernularia, Vei'etillum.^i 



Fam. 5. Renillib^. ■ The coral expanded, foliaceous, Avith a 

 slender stalk. The polypes only on one surface of the ex- ^ 

 panded disk, not retractile. Renilla, IlerJdotsia, licnillina. 3-^ 



Subsection I. PENNIFORMES. 



Coral pen-shaped. Polypes in transverse ridges or pinnules, placed 

 on each side of the upper part of the ventral surface of the central 

 stem. 



