214 



K. MITSUKUKI : STUDIES ON 



•' palmure." Just posterior to this, there is a pair of small pointed 

 conical appendages. In front of the " palmure " the body bends 

 downwards and the mouth faces entirely ventrad. There are ten 

 tentacles with the disk at the top not much larger than the stem. 

 At the lateral edge between the dorsum and the ventrum there 

 are about eight pairs, sometimes one or two more, of lateral papillae 

 which gradually diminish in size from before backwards. The 

 perisome is tolerably thick and translucent, the viscera inside 

 showing through by their livelier hues. At the time, the sexual 

 organs were ripe. The madreporic canal opened externally near 

 the sexual opening. 



Calcareous deposits : In the perisome, " examined in both 

 fresh and preserved states, there are only C-shaped bodies (text- 

 fig. 39 c) and large and 

 small spiny bent rods («). 

 Both seem to be confined 

 to the tips of the papillae. 

 It may seem that the species 

 is referable to the genus 

 Kolcja, but there are pre- 

 sent in the wall of the 

 main reproductive duct many 

 triradiate spicules and a 

 smaller number of four- 

 radiate spicules as well as 

 C-shaped bodies {h). 

 For this reason I put the species in the genus Pcriamma, although 

 it seems intermediate between Kolga and Periamma. The tentacular 

 crown has bent calcareous rods. In the calcareous ring, five 

 slender spider-like radialia alone are present {d). Pohan vesicle one. 



Textfig. 39. 



Perunmna kumai : a — Beut rcxl ; 6— Triradinte 

 rod from genital tubes ; c — C-shaped lx)dy from 

 genital tiibes; d — Calcareoi-.s ring, (a — c x 24(( ; d 

 X ca. 65). 



