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



margined membrauous collar. The root-tuft bears uo Palythoa encrustation, aud consists 

 of tolerably straight spicules. The central cone rises to the opening of the gastral 

 cavity, which is traversed by four cruciate radial septa. The small oxyhexacts of the 

 parenchyma are almost wholly provided with curved rays, which Ijear small barljs. 

 Between these there are a few oxyhexacts with small barbs on the straight rays. The 

 laro-er amphidiscs bear somewhat long, lacerate, campanulate terminal umbels, with eight 

 slender pointed rays. The dermal pinuli have short, thick, rough basal rays, and a radial 

 beset with long lateral spines. The gastral and canalicular pinuli have long rough basal 

 rays, and a weakly developed radial with short thin lateral spines. North of Mellish 

 Islands, Mid-North Pacific, 2050 fathoms. 



Species 4. Stylocalyx claviger, n. sp. 



The oscular margin of the oval body is sharp. The small parenchymal hexacts have 

 delicate, smooth, usually quite straight rays. The large amphidiscs have broad, or some- 

 what highly arched terminal umbels, with eight broad paddle-shaped rays. The dermal 

 pinuli are compressed, with bushy superiorly somewhat truncated radial ray. The gastral 

 pinuli, on the other hand, have a long spindle-shaped solid radial ray, which is beset only 

 with short teeth and scales. Near the Penguin Islands, 1600 fathoms. 



Species 5. Stylocalyx globus, n. sp. 



The spherical body bears at the basal pole a slender root-tuft of straight needles, 

 without any Palythoa encrustation, while the superior pole exhibits a comparatively 

 small, circular, sharp-edged oscular aperture without a fringe of spicules. From 

 the free central cone four cruciate sharp-edged radial septa extend. The small paren- 

 chymal oxyhexacts have smooth, slender, straight rays. The larger amphidiscs have 

 broad terminally truncate, tolerably short, terminal umbels, in which eight straight 

 paddle-shaped rays diverge markedly outwards. The dermal pinuli have long, firm, 

 roughened basal rays, and a moderately short bushy radial ray, in which the strongly 

 developed axial portion bears long bent lateral spines, and ends in a conical swelling. 

 The gastral pinuli have also moderately long and rough basal rays, but the radial 

 which runs to a thin point bears short curved lateral spines. Near the Banda Islands, 

 360 fathoms. 



Species 6. Stylocalyx elegans, n. sp. 



The approximately spherical, Ijut inferiorly conical body bears in the middle of the 

 obliquely truncated upper surface an irregularly contoured oscular aperture, above which 



