REPORT ON THE HEXACTINELLIDA. 373 



Subfamily 3. Caulophacin.e, F. E. S. 

 Mushroom-like, with long, cylindrical, hollow stalk. 



Genus 1. Caulophacus, n. gen. 



The dermal surface of the body, which is flattened from above downwards, is either 

 slightly convex or has become concave by the downward folding of the marginal portion 

 of the flat body, The projecting ray in the dermal pinuli is short and broad, but long 

 and weakly developed in the gastral. 



Species 1. Caulophacus latus, n. sp. 



The body consists of a flat circular disc with a downward-folded sharp-edged 

 margin. The long cylindrical stalk passes by a trumpet-shaped expansion into the 

 middle portion of the disc. The parenchyma contains discohexacts, oxyhexasters, and 

 numerous discohexasters. The short dermal pinuli are almost all hexacts, the long 

 gastral pinuli are, on the other hand, pentacts. West of Crozet Islands, 1600 

 fathoms. 



Species 2. Caulophacus elegans, n. sp. 



The disc is either biconvex, or with down-turned marginal portion convex-concave. 

 The parenchyma contains, besides numerous discohexacts, also four-rayed discohexasters. 

 The dermal and gastral pinuli are hexacts. The radial rays of the hypodermal pentacts 

 are toothed. East of Japan, 2300 fathoms. 



Genus 2. Trachycaulus, n. gen. 



With the single species Trachycaulus gurlittii, n. sp. 



The long stalk is covered with long pointed dermal pentact pinuli, and contains as 

 principalia long diacts which lie parallel in longitudinal series, and are firmly united by 

 means of synapticula. Subdermally large sickle rosettes occur, with four terminal rays on 

 each principal. South Pacific, 2550 fathoms. 



