REPORT ON THE HEXACTINELLIDA. :J77 



Genus 6. Rhahdocalyptus, n. gen. 



Moderately thin-walled cups with smooth external surface,, and sharp-edged smooth 

 margin to the wide oscular aperture. The inner surface exhibits holes of variable size — 

 the apertures of the eflferent canals. The principal parenchymalia are diacts of variable 

 length. The parenchyma also contains discohexasters and oxyhexasters, and further 

 eight-rayed rosettes with disc-bearing terminal rays on each of the medium-sized 

 principals. The dermal membrane contains rough diacts either exclusively, or plus 

 rough pentacts, tetracts, and monacts. The gastralia are rough oxyhexacts. 



Species 1. RhabdocalyjJtus mollis, n. sp. 



A funnel-shaped, somewhat compressed cup with a short round stalk. The paren- 

 chyma contains small oxyhexacts in which the rays near the point of intersection are 

 beset with inward directed spines. The rays are frequently curved and may be also re- 

 duced to four or two. The dermal membrane contains only rough diacts, and the gastral 

 membrane only rough hexacts. Japan, 100-200 fathoms. 



Species 2. Rhahdocalyptus roeperi, n. sp. 



A sack-shaped cup, which is directly attaiched by its thick blind end. The paren- 

 chyma contains oxyhexasters with short principal rays and long undulating terminals. 

 The dermal membrane contains rough pentacts, tetracts, diacts, and monacts. In the 

 gastral and canalicular membrane there are weakly developed hexacts with tubercled or 

 uniformly rough rays. South of Puerto Bueuo, Patagonia, 400 fathoms. 



Genus 7. Crateromorpha, Gray. 



Stalked goblets with smooth external surface. On the gastral internal surface the 

 L'tiereut canals open directly into the gastral space, with round apertures of variable 

 width. In the loose parenchyma, besides medium-sized hexacts and diacts oxyhexasters 

 and discohexasters occur of variable form and size. The dermal membrane contains 

 rough tetracts, pentacts, and sometimes also diacts, all three with club-shaped thickened 

 ends. The gastral membrane contains rough pentacts. 



Species 1. Crateromoipha meyeri, Gray. 



A tulip-shaped cup, varying in size from a hen's to a goose's egg, and seated on a 

 Ik of the length and thickness of one's little finger. On the oscular margin of the wide 



(ZOOL. CHALL. EXP. I'AUT LIII. 1887.) Ggg 48 



