REPOET ON THE ALCYONAEIA. XV 



are rigid and brittle, the spicules are straight or curved spindles which are often spiny 

 and sometimes become almost club -like. 



10. CijathojJodiujn, VerrCl, Amer. Journ. Sci. and Arts, vol. xlv. p. 415, 1868. 



Aulopara, Dana, Zooph., p. G.30, pi. lix. fig. 5. 



The colony reminds one of that of Tuhipora ; it consists of a series of short cup- 

 shaped tubes, connected by narrow, calcareous stolons, which seem to correspond to the 

 transverse plates in Tuhipora, and from which the new polyps arise. 



11. Sderanthelia, Studer, Monatsbcr. d. k. preuss. Akad. d. Wiss. Berlin, 1878, p. 



624, pi. i. fig. 4. 



The colony forms an irregular incrusting base, from which the polyps arise. The 

 new polyps originate by 1)udding from the base of the older polyps, so that sometimes 

 there is an appearance of a small axis. The tentacles are retractile. The body wall of 

 the polyps is furnished with a pavement of broad, polygonal, calcareous, scale-like 

 spicules, which are warty on their outer sides. 



12. Anthopodinm, Verrill, Amer. Journ. Sci. and Arts, ser. 3, vol. iii. p. 434, 1872. 



The colony is incrusting, firm. The polyps arc large, prominent, retractile within 

 tubular verrucas. The surface of the coenenehyma and verrucas is minutely granular 

 with the dentations of the spicules projecting ; these spicules are irregular in outline, and 

 closely united together. The spicules, in addition to those mentioned, are spiny spindles 

 and clubs. 



13. Sympodium, Ehrenljerg, Corall. des rothen Meeres, p. 61; Milne-Edwards, Hist. 



Nat. des Coralliaires, t. i. p. 110; Kolliker, Icones histiologicse, pt. ii. p. 141; 

 Klunzinger, Korall. des rothen Meeres, pt. i. p. 42 ; Danielssen, Norske. 

 Nordhavs-Exped., 1876-78, Zool. Alcyonida, p. 141. 



The basis of the colony is a thin l)ut leathery membrane, from which the prett)- 

 numerous polyps arise ; these are short, retractile, and are sunk deeply into the basal 

 membrane. The spicules are very small and disc-like. 



14. Erythropodium, Kolliker, Icones histiologicse, pt. ii. p. 141. 



The colony has an incrusting and membranous base ; with the polyps retractile 

 within very small verrucse, the retracted tentacles forming, on contraction, a stellate 

 marking. The spicules are long, hexradiate, with rounded ends and small dentations. 



