SUBORDER ALCYONARI A. 639 



find crimson, scarlet, orange, and various shades of yellow presented 

 by the same species, and sometimes an orange variety, when unex- 

 panded, is dotted over with crimson points, the bases of the several 

 retracted polyps. 



The following subdivisions of the Gorgonidse adopted in this work, 

 depend on the modes of budding and growth just explained, on the 

 nature of the foot-secretions, and the consideration whether the polyps 

 are retractile or not. 



SUBFAMILY I. CORALLIIN.E. Axis inarticulate, solid calcareous ; polyp-crust fleshy, 



without coral-secretions. 

 G. 1. Corallium. 



SUBFAMILY II. GOKGONIN.E. Axis inarticulate, corneous, or semi-solid, with calca- 

 reous or siliceous secretions ; tissue-secretions forming a persistent crust to the 

 axis. 



G. 2. Hyalonema. Axis not solid, consisting mostly of siliceous threads or spicula. 



G. 3. Briareum. Axis not solid, suberose or containing calcareous spicula. 



G. 4. Gorgonia. Axis solid, corneous ; polyps retractile, with or without fixed 

 verrucas on the surface after retraction. 



G. 5. Primnoa. Axis solid ; polyps retractile into oblong movable verrucse, im- 

 bricately squamous. 



G. 6. Bebryce. Axis solid corneous; polyps not retractile. 



SUBFAMILY III. ISIN.E. Axis jointed, budding being periodical. 



G. 7. Mopsea. Joints alternately calcareous and corneous, furcato-ramose with 



corneous axils ; cortex thin. 

 G. 8. Isis. Joints alternately calcareous and corneous ; branches proceeding from 



the calcareous joints ; cortex thick. 

 G. 9. Melitcea. Joints alternately calcareous and suberose ; cortex thin. 



SUBFAMILY I. CORALLIIN^E. 



Gorgonida axem inarticulatum lapideum solidum elaborantes. 

 Gorgonidse forming an inarticulate solid stony axis. 



