134 K. MITSUKUEI : OÏUDIES ON 



out from somewhat contracted specimens, tliey are 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. 1030), I observed one rather 

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

 tery, and three finger-like Cuvierian 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 interambulacrum ; 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 textfig. 2oa. 



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

 merged with //. fuscoclncrca Jaegeu and witli IL curiosa Ludwig, 

 I am strongly inclined to accept it. The specimens which I have 

 examined may without much difficulty be placed in 11. fuscoclnc- 

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

 into buttons, although I can not find any exactly corresponding 

 to those figured by Sempee for 11. fiiscocinerca. In other points, 

 the specimens may be said to agree completely with the descrii)- 

 tion of II. fuscocincrea by that author. Further, the fact that, ah 

 thougli 11. fuscocincrea has been reported by Ludwig to occur in 

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

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



