REPORT ON THE ALCYONARIA. XXXvii 



(5. Clathraria, Gray, Cat. Lithophytes Brit. Mus., 1870, p. 11 ; Proc. Zool. Soo. 

 Lond., 1859, p. 486. 



Cylindrical, manifoldly curved branches, often anastomosing, and of uniform 

 thickness throughout. The polyps are sunk into the coenenchyma. The axis includes 

 no nutritive canals. Spicules in cortex, broad and short foliaceous clubs. 



7. Parisis, Verrill, Bull. Mus. Comp. Zool., 1864, No. 3, p. 37. 



In contrast to the general rule amoncr the Melitodidae, the branches here arise from 

 the internodes. The protruding calyces arise on the smaller branches over the 

 entire margin. The .spicules remind one of those of Isia ; they are thick, irregular, 

 often constricted in the middle and beset with warts. TrineUa sirinhoei, Gray, for 

 which Gray established his genus TrineUa, was based on the axis of a Parisis, over- 

 grown by a siliceous Sponge, and bearing the polyps of a Palythoa, which Gray 

 mistook for Alcyonarian polyps. 



Family IV. C o r a l l i d ^. 



CoraUlds, Gray, Proc. Zool. Soc. Loud., 1857, p. 28G ; Ann. and Mag. Nat. Hist, 1859, 

 ser. 3, vol. iv. p. 444 ; Proc. Zool Soc. Lond., 1859, p. 480; Cat. Lithophytes 

 Brit. Mus., 1870, p. 22; Ridley, Proc. Zool. Soc. Lend., 1882, p. 221. 



Coi-allinse, Dana, U.S. Explor. Exped., 1846, p. 639 ; Milne-Edwards, Hist. Nat. des Coralliaires, 

 t. i. p. 201. 



The axis consists of a dense calcareous mass the result of spicules fused together. 

 Both auto- and siphonozooids occur. 



Ridley ' has pointed out the close relation.ship between the Corallidse and 

 Melitodidae. 



1. Corallium, Lamarck. | 2. Pleurocorallium, Gray. 



1. Corallium, Lamarck, Hist. Nat. Anim. sans Vert., ed. 1, 1816, t. ii., p. 295 ; Lacaze 



Duthiers, Hist. Nat. du Corail, Paris, 1864 ; Ridley, Proc. Zool. Soc. Lond., 



1882. 



The genus Co?'aZ/mm, represented by the precious coral [Corallium ruhrum), has only 



one kind of spicule, and the calyces of the polyps occur over the entire surface of the 



colony. 



1 Loc. cit., supra, pp. 221-233. 

 (zool. CHALL. EXP. — PART LXIV. — 1889.) Sss / 



