ACTINOPODOUS HOLOTHÜRIOIDEA. 



49 



Description :— Tentacles 20. Papillae on the dorsal surface ; 

 pedicels on the ventral surface, both numerous. Calcareous deposits 

 alike in the dorsal and the ventral perisome. The outer layer 

 consists of robust, rather sparsely scattered tables with a smooth 

 disk O.OG — 0.08 mm. in diameter, and a spire terminating in IG — 

 20 teeth. The thick lower layer consists of closely packed, hol- 

 low, fenestrated ellipsoids, 0.07 mm. long, and with four rows of four 

 openings each, sometimes with a central axis-like rod piercing 

 through the middle. Color plain black, or having on a coal-black 

 ground 5 — 7 snow-wliite transverse spots on the sides and a circle 

 of smaller wdiite spots on the dorsum. There exist all intermediate 

 shades of coloration between these two extremes. Calcareous ring 

 conically narrowed in posterior direction. Interradialia about lialf 

 as high as radialia, which are three-pointed. Cuvierian organs in 

 bundles of 5—10, at the base of right respiratory tree. Ten- 

 tacular ampullae very large. 



Remarks :— The tables (textfig. 10, /— ??) are quite stout, witli 

 a more or less complete circle of liolos around tlio large central 

 one. Only one cross-beam. The spire ends in a number of 

 teeth, (^f the ellipsoids, Selenka says (loc. cit.) that they are 

 "zusammengedrückten hohlen, von viermal vier T.öchern durch- 

 bohrten Kalkellipsoiden von 0.07 nmi. Lcänge, zAiweilen von einem 



