134 K. MITSUKUIU : STl-MES ON 



out from somewhat coutructL'd specimons, they arc devoid of end- 

 plates. The supporting rods are simple curved rods of about the 

 same length as those in ventral pedicels, but with, at most, short 

 tooth-like projections at irregular intervals along the sides instead 

 of latticework. 



In one small specimen (No. K^toO), I observed one rather 

 large stone-canal on the right side near the dorsal mesen- 

 tery, and three fiugcr-like Cuvicrian vesicles on the left respira- 

 tory tree near its base. No Polian vesicle could be detected. In 

 a large specimen (No. 1040) I found one stone-canal 1 cm. 

 long near the dorsal mesentery on the right side and one Polian 

 vesicle several cm. long on the left ventral intorambulacrum ; a 

 bunch of numerous large Cuvierian threads, 2 mm. thick and up 

 to 9 cm. long, was present on the respiratory tree before its bi- 

 furcation, a few more threads occurring also on the right respira- 

 tory tree. 



The calcareous ring of the species is of the structure shown 

 in toxtfig. 23rt. 



As to Bedfoud's statement that this species ought to be 

 merged with //. fuscoclncrca Jaegei; and with 11. curiosa Ludwig, 

 I am strongly inclined to accept it. The s})ecimens which 1 liavc 

 examined may without much difficulty be placed in //. fuscodne- 

 rea. In nearly all of them, many of the rods become converted 

 into buttons, although I can not lind any exactly corresponding 

 to those figured by Semper for II. J'lcscocinerea. In other points, 

 the specimens may bo said to agree completely with the descri})- 

 tion of H. fiiscocinerea by that author. Further, the fact that, al- 

 though //. fiiscocinerea has been reported by Ludwil; to occur in 

 Japan, 1 have not as yet come across any specimens that I can 

 indubitably identify with it, may be said to speak for the identi- 



