xl THE VOYAGE OF H.M.S. CHALLENGER. 



{Hero2ohila) were the next. These genera were referred to the Gorgonellidse. Under 

 the name Chrysogorgia two corals were diagnosed and figured,' but the second is 

 probably to be referred to the Primuoidse. Verrill has taken the first descril)ed form as 

 the type of the amended genus Chrymgorgia. 



Verrill has described ^ some new forms of Alcyonaria allied to Chrysugorgia deshonni, 

 Duch. and Mich., for which he established the genera Dasygorgia and Iridogorgia, 

 and formed for them and Chrysogorgia the family Chrysogorgidse. The discovery of several 

 new species of Dasygorgia in the Challenger collection, and of a new genus characterised 

 by the presence of an unbranched stem {Strophogorgia) has induced us to unite all the 

 genera in one family of Dasygorgidse, with the two subfamilies Strophogorginse and 

 Chrysogorginse. 



Subfamily 1. Strophogorgin^. 

 1. Strophogorgia, Perceval Wright. 



Subfamily 2. CnEYSOGORGiNiE. 



2. Chrysogorgia, Duch. and Mich. 



3. Herophila, Steenstrup. 



4. Dasygorgia, Verrill. 



5. Iridogorgia, Verrill. 



Subfamily 1. Strophogorgin^. 



Axis simple, rod-like, arising from a calcareous base ramifying into root-like processes. 

 The polyps are cylindrical, projecting obliquely upwards from the stem. The spicules 

 are rod-like or lenticular. 



1. Strophogorgia, Perc. Wright, Narr. Chall. Exp., vol. i. p. 691, 1883. 



Subfamily 2. Chrysogoegin^. 



Chiysogorgidse, Verrill, Bull. Mus. Gomp. Zool., vol. xi. No. 1, p. 21, 1883. 



The colony is branched, consisting of a main axis around which the branches 

 are spirally disposed ; these may give off secondary twigs. The polyps are relatively 

 large, arising at right angles or obliquely from the branches, fiask- or club-shaped. The 

 spicules are semi-opaque, flattened, and irregular in form, scale-like. In many species 

 siphonozooids are present. 



2. Iridogorgia, Verrill, Bull. Mus. Comp. Zool, vol. xi. No. 1, pp. 21, 26, 1883. 



Branches simple, occurring in spirals round the main axis. Siphono- and autozooids. 

 The latter are flask-shaped. The spicules are smooth and rod-like. 



1 Tom. cit, p. 13, pi. i. figs. 7, 8. 



- Bull. Mus. Comp. Zotil., vol. .\i. No. 1, p. 21. 



