lii TilE VOYAGE OF H.M.S. CHALLENGER. 



1. Acanihogorgia, Graj-, Proc. Zool. Soc. Lond,, 1857, p. 128 ; Verrill, Bull. Mus. 



Comp. Zofil., vol. xi. No. 1, fig. 30. 



Blepharorjor-jia, Duch. ami Mich., Supp. Mom. Corall. des Antilles, 1864-66, p. 109. 



The colony is branched. The polyp calyces are large, cylindrical, elongated. The 

 calj^cine spicules are often expanded terminally, into eight long spines projecting over 

 the oral region. On the sides of the calyces the spicules are disposed in eight rows. 

 The coenenchyma is thin, containing long spindle-shaped spicules. 



2. Paramuricea, Kolliker, Iconcs histiologicae, pt. ii. j>. 136, 1865. 



Villogorgia, Duch. and Mich., emend. Ridley, Ann. and Mag. Nat. Hist., vol. ix. p. 18", 1882. 

 Paramuricea, Verrill, emend., Bull. Mus. Comp. Zocil., vol. xi. p. 34, 188-3. 



The colony is branched. The coenenchyma is thick, with longish rough spindle- 

 shaped and irregular spicules. The polyp calyces are short, cylindrical, or wart-like, they 

 are furnished with a circlet of short projecting needles, which are the apices of large 

 spicules. The spicules of the calyces are disposed in eight rows ; they are for the most 

 part spiny discs, with an elongated smooth spine from the base of which stellate processes 

 radiate. The bases of the contracted tentacles form an eight-rayed operculum, the 

 spicules are disposed en chevron on each raj'. 



3. Hypnogorgia, Duchassaing and Miclielotti, Supp. Mem. Corall. des Antilles, 1864, 



p. 21. 



Hypnofjm'giadx, Gray; Hypnogorgia, Gray, Cat. Lithophytes Brit. Mus., 1870, p. 33. 



The colony is upright and branched ; branches pendulous. The polyp calyces arise 

 from two sides of the axis ; they are opposite, or alternate. Their inner surface is 

 attached to the axis of growth. The operculum is elevated and conical. The spicules of 

 the calyx are long spindles, in shape similar to those of the coenenchyma. 



4. Muriceides, Wright and Studer, Archiv f. Naturgesch., Jahrg. liii. Bd. i. p. 54. 



The colony is but slightly branched. The large projecting polyps spring for the most 

 part from one side of the axis. The operculum formed from the bases of the tentacles is 

 elevated and conical. The spicules in the coenenchyma and calyx are irregularly disposed 

 spiny spindles, and triple or multiple stellate forms. Of these latter one ray is generally 

 to be found protruding beyond the coenenchyma. The axis is horny and flexible. 



