ACTINOPODOUS HOLOTHURIOIDEA. 



This on one side is a plate of close-meshed latticework. On the 

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

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

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

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

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

 calcareous body on each side of the cloacal opening. 



In the branches of the tentacles there exist numerous 

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

 a bent spindle shape with a few teeth. There is " no calcareous 

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

 the respiratory trees. Also none in tlie pedicels. 



No tentacular ampullae. Two genital bundles ; each genital 

 tube simple and short ; if 



branching, so only at the « ^--^a-^ v^ Textfig. i. 



end. In one small speci- 

 men, I thought I made 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 specimen, quite near the base of the vesicle, there were two 

 small appendages with 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 the middle of each 



rseudosiichopus 

 trachus : a — Side 

 view of calcareous 

 ring ; 5— Posterior 

 view of the same ; 

 c, (2— Supporting 

 rods of tentacle. 

 xl60. 



I— Interradialin ? 



R— Radialirt. 



