254 K. JiiTSUKUEi : studies on 



ventral ambulacm the pedicels, especially in the middle part, arc 

 more crowded than on the liivium. The interambulacra are free 

 of pedicels and papillae on both dorsal and ventral surfaces. 

 Tentacles ten, the two ventral ones small. Although I am unable 

 to make a searcliing examination on this unique specimen, the 

 tentacles appear to me not to have the usual dendritic shape, but 

 to be formed of a series of flat plates attached along the stem, 

 somewliat in the fashion of cephalopod gills. (Jf the calcareous 

 ring, the radialia are three-pointed anteriorly, while the interradialia 

 are single -pointed (textfig. .51 a). No posterior prolongations on 

 either. There is one large stone-canal. 



The calcareous deposits are abundant. They entirely cover 

 tlie body hke armor. They consist each of a large smooth-edged 



plate with numerous holes 

 in it. Here and there, 



li I |\ /oqO 'o "^ _ '~^'^r\\ mixed with these plates, 



llUi / O o ° o o ° r^ I n 1- . 



j 1^ — ^ /Oo o o ^' ^~,0 \ are smaller ones which 



have a far smaller num- 

 ber of holes (6). These 

 smaller plates are especial- 

 ly heaped up at the base 



Textfig. 51. -\ i ■ t f • 



Cucumari'i sijuainidosa : a — C.ilcareous ring; b — Smaller fll^Cl Oil tllC SIQCS 01 pecllCelS 

 l^rfomted plate, X 60. I-mterradiali.; H-Ea,Tiai... ^^,j^;g,^ j^.^^.^ Cnd-platcS. 



In the tentacles, there are also supporting rods which are spiny. 



Remarks : — Tliis species is undoubtedly near C. munita Sluiter 

 and C. hyndmanni Thompson. However, it differs from the former 

 in having calcareous deposits crowded in the pedicels, and fi'om 

 the latter in the shape of the supporting rods in the pedicels. I 

 can not identify this species with any hitherto described, and 

 am therefore obliged to establish a new species for it. 



