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



6. Cortina cervina, n. sp. (PL 92, fig. 21). 



Pdng ovate, with four pairs of forked horizontal spines (two dorsal and two ventral pairs) 

 Apical horn straight and stout, as long as the ring, with trifid point. Three feet *qual, 

 widely divergent, very large, branched like a deer's antler, with very numerous short and stout, 

 curved and pointed branches. All rods and branches roundish, without edges. 



Dimensions. — Height of the ring 01, breadth 0-07 ; length of the feet 012 to 0-16. 



Habitat. — Central Pacific, Station 265, depth 2900 fathoms. 



Genus 406. Stejihaniurn,^ n. gen. 



Definition. — S t e p h a n i d a with a simple dipleurie or bilateral ring, bearing at 

 the liase four divergent feet (two sagittal and two lateral feet). 



The genus Stephanium differs from the preceding nearly allied Cortina in the 

 production of four basal feet ; the new foot, missing in the latter, is the anterior or 

 sternal foot. Therefore Stejihanium may be regarded as the archetype of all those 

 Nassellaeia in which, on the base of the sagittal ring, there are developed four typical 

 feet — two sagittal feet (the posterior caudal and anterior sternal foot) and two lateral 

 feet (right and left). On the origin of Stejihanium compare above, p. 893, &c. 



1. Stephanium quadrupes, n. sp. (PI. 92, fig. 20). 



Eing ovate, with three prominent dentate edges and a short pyramidal apical horn. Four feet 

 aU of nearly equal size, about as long as the ring, also with three thorny edges, in the upper half 

 divergent, in the lower convergent. 



Dimensions. — Height of the ring 012, breadth O^OS ; length of the feet Oil to 013. 



Hahitat. — Central Pacific, Station 266, depth 2750 fathoms. 



2. Stephanium tetrapus, n. sp. 



Eing elliptical, without edges, thorny, with a stout, thorny apical horn of the same length. 

 Four feet curved and irregularly branched, divergent, of different size. The two sagittal feet (the 

 anterior sternal and posterior caudal) about as long as the ring. The two lateral feet (right aud 

 left) nearly twice as long, more richly branched. 



Dimensions. — Height of the ring 016, breadth Oil ; length of the feet 015 to O'S. 



Habitat. — Central Pacific, Station 272, depth 2600 fathoms. 



1 SUphanium=^va.&]l crown or garland ; aTtipaunju. 



