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



5. Anthelia, Savigny, Lamarck, Hist. Nat. Anim. sans Vertebres, 1816, vol. ii. p. 



407, ed. 2, p. 622; Kolliker, Icones histiologicse, pt. ii. p. 132. 



The colony consists of a membranous expansion upon which the uou-retractile poly^js 

 are carried, their bases are surrounded by a somewhat thickened coenenchyma, which is 

 penetrated by the nutritive canals. The pol}'p tentacles are retractile. The .spicules of 

 the coenenchyma and the polj'ps are spindles, .sometimes spiny and warty, of a red 

 colour or colourless. 



6. Gymnosarca, Saville Kent, Quart. Journ. Micr. Sci., vol. xviii. p. 397, pi. xxi. 



The colony contains numerous and thick-walled creeping stolons ; these anastomose 

 and give rise to free cylindrical stolons, on which the polyps are found. The polyps are 

 cylindrical, semi-retractile. Spicules, fusiform and echinate spindles, mixed with some 

 arcuate forms. 



7. Cornulariella, Verrill, Amer. Journ. Sci. and Arts, 1874, ser. 3, vol. vii. p. 40 



(footnote). 



The colony consists of a series of creeping stolons, from which the tubular polyps 

 arise. The polyps have large tentacles, with short thick pinnae ; the upper portion of 

 each polyp has few spicules and is retractUe within the lower portion, which is quite rigid 

 from being well packed with numerous warty spindle-like spicules. 



8. Tclesto, Lamouroux, Bull. Soc. Philom. Paris, 1812; Polypiers flexibles, p. 232, 



1816. 



Telesco, Telescella, Alexella, Gray, Ann. and Mag. Nat. Hist., ser. 4, vol. iii. p. 21, 1869. 

 Carijoa, F. Mtiller, Arcliiv f. Naturgesch., Jahrg. xxxiii. p. 330, Anm., p. 56, 1867. 

 Clavularia, v. Koch., Morph. Jalirb., Bd. vii. p. 468. 



From a membranous base or from stolons the axial polyps with deep gastral cavities 

 arise ; from their body walls, lateral polyps bud forth ; the polyp structure is in general 

 like that in Clavidavia. The walls of the polyp calyces, into which the anterior 

 tentacular portion may be retracted, contain spicules. These are sometimes united 

 together by a horny substance. 



9. Coelogorgia, Milne-Edwards, Hist. Nat. des Coralliaires, t. i. p. 191. 



In this genus the colony is arborescent ; the stem is formed by an axial polyp, 

 which is attached by stolon-like processes ; from its body Avail branch-like axial polyps 

 of a second order arise, which may again bear lateral polyps. The polyps are not re- 

 tractile, the tentacles fold down over the oral portion. The whole colony and the polyps 



