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



Stichopathes ? liitheni, n. sp. (PL XII. figs. 28, 28a). 



Cirrlripathes filiformis, n. sp., Liitken, MS. 



Stem about 80 cm. long, slightly tapering; diameter 2 mm. at base, 0*7 mm. at apex. 

 The lower portion of the stem is nearly straight, the upper is flexed and twisted into three 

 irregular open spirals, the terminal ones being 7 cm. in diameter. This species bears a 

 general resemblance to Stichopathes filiformis (Gray), and in the subspiral growth of the 

 stem is intermediate between that form and the truly spiral species, such as Stichopathes 

 pourtalesi, n. sp., and Cirripathes spiralis (Linn.). It is probable that the amount of 

 flexure, &c, may vary in different specimens. This species is, however, readily 

 distinguished by an examination of the spines, which are slightly but distinctly papillose, 

 a character not found in any other species of this or the preceding genus hitherto 

 described. The spines, as in Cirripathes spiralis and some other species, are longer on 

 one side of the axis than on the other. The short spines are triangular, somewhat com- 

 pressed, and have a sharp apex ; the longer ones are conical, only slightly tapering and 

 have a blunt apex. Each is covered for almost its whole length with fine granular papilla?. 

 The spines are arranged in irregular spirals and also in longitudinal rows, eight of which 

 are visible from one aspect in the portion figured (PI. XII. figs. 28, 28a). In the 

 lower part of the stem the spines are arranged in longitudinal rows, which turn very 

 gradually round the stem. They are here short and triangular, and apparently subequal. 

 The polyps have not been observed. 



Habitat. — West Indies. The type is in the Zoological Museum of the University of 

 Copenhagen. 



Section II. RAMOSiE, corallum branched. 

 Genus Leiopathes (Gray), M.-Edw. and Haiine, emend. 



Antipathes (pars), Esper, Pflanzenth. ; Lamarck, Hist. nat. anini. sans vert., t. ii. ; Dana, 

 Zooph.; Gray, Proc. Zool. Soc. Lond., 1832, p. 41 ; Duch. and Mich., Mem. Acad. Torino, 

 ser. 2., t. xxiii.; Pourtales, Cat. Corals Harvard Mus., No. iv., 1871; Bull. Mus. Comp. 

 Zool, 1880. 



Leiopathes (pars), Gray, Synop. Brit. Mus., 1842, p. 135; M.-Edw. and Haime, Brit. Foss. 

 Corals, Introd., p. Ixxiii.; Archives d. Mus. Paris, t. v., 1851, p. 176 ; Gray, Proc. Zool. 

 Soc. Lond., 1857, p. 289; M.-Edw., Coralliaires, t. i., 1857, p. 322. 



The polyps possess three pairs of primary mesenteries and three pairs of secondary 

 ones. One pair of secondary mesenteries is very short, and none of them extend into 

 the lower section of the ccelenteron. The sagittal tentacles are usually longer and 

 thicker than the other four. The corallum is dendriform, and the ultimate branchlets 

 are always very slender. The sjnnes are very short and never very numerous. They 



