REPORT ON THE ALCYONARIA. xiii 



9. Caslogorgia, Milne-Edwards. 



10. Ci/athopodium, Verrill. 



11. Scleranthelia, Studer. 



12. Anthojiodium, Verrill. 



13. Sympodium, Ehrenberg. 



14. Erythropodium, Kolliker. 



15. Ccdlipodium, Verrill. 



16. Pseudogorgia, Kolliker. 



1. Cornularia, Lamarck, Hist. Nat. Anim. sans Vertebres, t. ii. p. 3, 1816, ed. 2, 

 p. 127; Milne-Edwards, Hist. Nat. des Coralliaires, t. i. p. 105. 



The colony consists of a number of free polyps, united, however, to one another 

 by root-like stolons, which latter creep over various foreign bodies. Spicules are not 

 met with, but a horny substance gives some rigidity to the polyp tubes. 



2. Rhizoxenia, Ehrenberg, Corallenth. d. rothen Meeres, p. 55, 1834; Milne- 

 Edwards, Hist. Nat. des Coralliaires, t. i. p. 107; Dana, U.S. Explor. Exped. 

 Zooph., p. 606. 



Evwjora, Phillipi, Archiv f. Naturgesch., Jahrg. viii. p. 36, 1842. 



In this genus the colony resembles that of Cornularia, but the polyps are well 

 furnished with spicules ; the pclyps are not retractile. 



3. Clavidaria, Quoy and Gaimard, cf. Blainville, Diet. d. Sci. Nat., t. x. p. 499, 

 1830; and Voyage de I'Astrolabe, t. iv. p. 260; Studer, Monatsber. d. k. 

 preuss. Akad. d. Wiss. Berlin, 1878, p. 632. 



The species of this genus resemble much those of Cornularia, but are easily dis- 

 tinguished from them by the presence of spicules, while the polyps being retractile can 

 thus be separated from those of Rhizoxenia. 



4. Sarcodictyon, Forbes, in Johnston's Hist, of Brit. Zooph., ed. 2, 1847, vol. i. \\ 

 179; Herdman, Proc. Roy. Phys. Soc. Edin., vol. viii. p. 31. 



The colony presents the appearance of a narrow band, the stolon, which is adherent 

 and bears at intervals the retractile polyps. The stolon is flattened, tape-like, sometimes 

 anastomosing ; the polyps are mostly but not always in single series. The spicules are 

 spiny spindles and irregular stellate and disc-like forms. 



(ZOOL. CHALL. EXP. PART LXIV. — 1889.) SsS C 



