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



an elegant epithelium of large hexagonal cells (fig. 8, y), and a distal proboscis. This hitter 

 is spindle-shaped, covered outside and inside with long cilia, and has in the middle a 

 spherical glandular dilatation, which contains a group of six to eight spherical (crystal- 

 line ?) concretions ; they are black in transmitted light, white in reflected light. The 

 pointed distal end of the cyston (figs. 5,8, yo) can be widely opened (fig. 9, yo) and the 

 excreta ejected through this anal opening. 



Gonodendra. — Each cormidium is monoclinic, and bears at its base two small 

 clustered gonodendra, a male (fig. 5, h) and a female (fig. 5,f). The gonostyles are in 

 both sexes little branched, and the gonophores attached by simple pedicles ; their 

 umbrella is little developed or rudimentary. Each gynophore (figs. 5,f, 15) encloses 

 only a single, large, subspherical ovum, surrounded by a network of spadicine canals (fig. 

 15, xm). The manubrium of the androphores (figs. 5, h, 14) is large, club-shaped, and 

 contains a simple axial canal or central spadix (fig. 14, he). 



Genus 46. Cuneolaria, Eysenhardt, 1 1821. 

 Cuneolaria. Eysenhardt, 16, Nova Acta Acad. Nat.-Curios., t. x. pars 2, p. 369. 



Definition. — Agalmidse with a long and movable siphosome, the trunk of which is 

 very contractile ; bracts with large intervals. Cormidia ordinate, with free internodes ; 

 palpons and gonostyles on the nodes. Tentilla tricornuate, with a terminal ampulla and 

 two paired horns. 



The genus Cuneolaria was established in 1821 by Eysenhardt (16, p. 369) for an 

 Agalmid from the Northern Pacific, near the Sandwich Islands, of which he had observed 

 (in September 1817) only the detached nectophores (fig. 5, a), bracts (fig. 5, be), and 

 tentacles (fig. 5, d, e, f). These seem to be identical with some fragments of an 

 Agalmid which was captured by the Challenger in the same region in September 1875 

 (Station 269). The form of the nectophores, bracts, and tentacles agrees perfectly with 

 the figures of Eysenhardt. A fragment of the siphosome exhibited four ordinate cormidia, 

 separated by free internodes, of the same composition as in Anthemodes (PI. XV.). 

 Cuneolaria differs, however, from this latter in the form of the tentilla, which are 

 tricornuate, as in Crystallodes (PI. XVII.). Stephanomia heptacantha, captured by 

 Quoy and Gaimard near the Molucca Islands (2, pi. iii. figs. 16-18), is perhaps identical 

 with that species. Stephanomia imbricata of the same authors, from New Zealand (2, pi. 

 iii. figs. 13-15), may be another species of the same genus. The figures and descriptions 

 of the French authors are, however, too incomplete to determine with any certainty the 

 true anatomical composition and systematic position of these Agalmids. Cuneolaria 

 exhibits the same relation to Anthemodes that Crystallodes bears to Stephanomia. 



1 Cuneolaria = Animal with wedge-shaped pieces, cuneolus. 



