ACTINOPODOUS HOLOTHUEIOIDEA. 



IGl 



37. Stichopus hirotai, sp. n. 



(Textfig. 28). 



Specimens examined 



Description: — Tentacles 18. Dorsal papilla3 on conical warts 

 of some mm. diameter ; arranged in rows on the two dorsal am- 

 bulacra and on the lateral edges of the dorsal surface ; no papil- 

 lae in the intervening spaces. Ventral pedicels numerous, in three 

 zones, each with several rows of them. The median twice as 

 broad as the two lateral zones. Polian vesicles in one specimen 

 three, of which two were large and one small. Stone-canal at- 

 tached to the mesentery, meandering greatly in its course. Mad- 

 reporic body somewhat large. Calcareous ring as in the allied 

 species : radialia four-pointed, interradialia single -pointed, somewhat 

 oblique, the dorsal part being higher than the ventral part. The 

 posterior prolongations of the radialia grow gradually larger to- 

 ward the dorsal part. 



Calcareous deposits: — (i) Slender, delicate tables with the^ 

 disk mostly small, almost quadrangular in shape, about 0.028 

 mm. (textfig. 28<:^ h). Those on ventral pedicels up to 



* The specimens are marked " Tokyo Market " which, I am certain, is a mistake ; they 

 were probably collected by Sasaki and party in the Ogasawara Is. 



