ACTINOrODOUS IIOLOTHURIOIDE.V. 



This oil Olio side is a plate of close-meshed latticework. On the 

 otliei- side, it is more like the body in the first specimen, consisting 

 of the open lattice iiart and tlu; closer lattice part ; and the 

 latter looks so much like the piece of tlie other side, that it is 

 highly probable that it is only a fragment. All things considered, 

 I think it is safe to conclude that tliere normally exists a 

 calcareous ])0(ly on each side of the cloacal opening. 



In the branches of the tentacles there exist numerous 

 calcareous supporting rods (textfig. 1 c, cl). They are mostly of 

 a bent spindle shape with a f((w teeth. There is no calcareous 

 body in tlie genital organs, nor any in the cloacal wall or in 

 the respiratory trees. Also none in the pedicels. 



No tentacular ampullae. Two genital Iiundles ; each genital 

 tube simple and short ; if 

 branching, so only at the 

 end. In one small speci- 

 men, I thought 1 niad(( out 

 a genital papilla. In others 

 examined, this was not dis- 

 tinct. Stone-canals unfor- 

 tunately not distinctly 

 made out. In one speci- 

 men a canal seemed to 

 accompany the genital 



duct, but its end could not be ascertained. Polian vesicle single, long. 

 In a specimen 12 cm. long, there was a Pohan vesicle 17 mm. long. 

 In this si^ecimen, quite near the base of the vesicle, there were two 

 small appendages witli end-knobs which looked very much like the 

 free stone-canals of some holothurians. Longitudinal muscles stand 

 out distinctly in the body-cavity. A groove along tbe middle of each 



^ <.^f\jr\j~^y^y^ 



Textfig. 1. 



Pseudosiictiopus 

 Irachus : a — Side 

 view of cnlcareous 

 ring ; ft— rosterior 

 view of tbe eame ; 

 <:, d — Supporting 

 rods of tentacle. 

 X IGO. 



I — luturradialin; 



R — Radialia. 



