THE SYSTEM OE FH YLI .OFHORINvE. 



Pseudocucumis, as we find an analogous case in the genus Cucumaria, 

 which includes forms with scattered pedicels in interambulacra, 

 formerly distinguished by Lampert as Semperia. 



Pseudocucumis japonicus with twenty-five tentacles and Ps. 

 intercédais with thirty tentacles had better be transferred to the 

 genus Amphicyclus Bell. 



II. Descriptions of Species. 

 Subfamily PhyllophorinaB Östergrex, 1907. 



Body cylindrical or spindle-shaped, with terminal mouth and 

 anus ; ventral surface not forming any sort of creeping sole. Tentacles 

 15 — 30 in number, in two or three orders. Third limb of alimentary 

 tract running along left side of midventral radial muscle. 



Six species of the group are known to occur in Japan. Amongst 

 them one seems to be new, and another is a doubtful species. They 

 may be distinguished as follows : — 

 a. Tentacles of the third order present, numbering 25 in all ; 

 pedicels limited to ambulacral zones ; calcareous deposits usually 

 absent from general body surface, but there occur tables with 



two-pillared spire in the introvert* Amphicyclus japonicus. 



aa. Tentacles in two orders only, numbering 15 — 20 in all. 

 b. Pedicels confined to ambulacra ; calcareous deposits of general 

 body surface in the form of large lenticular perforated plates.... 



Pseudocucumis africanus. 



bb. Pedicels distributed on both ambulacra and interambulacra. 



c. Tentacles 1 5 ; calcareous deposits absent from body-wall 



Phyllophorus limaconotus. 



cc. Tentacles 20 ; calcareous deposits present in body-wall. 

 d. In the introvert only tables with two-pillared spire ; in general 

 perisome tables in which spire is usually much reduced or has 



* I follow Edtvaeds [10, p. 54] to call by this name the anterior part of body which 

 can be' introverted. 



