IIIROSIII OTISIIIMA : 



radial segments. Exceptionally there seems to exist cases in which 

 the branches are given off in a way different from that described 

 above, and that especially with regard to the first and the second 

 branches. 



ii. Phyllophorus japoniens (v. MarENZELLER), Ph. fragilis, sp. 

 n., and Orcula hypsipyrga v. MARENZELLER. 



All these three species have twenty tentacles, which agree well 

 with same of Pseudocucnmis africanus in size and arrangement. In 

 them, as in Ps. mixta, the radial segments of calcareous ring sljow 

 on the axial surface slight depressions corresponding to the course of 

 tentacular canals. The branching of these canals takes place in 

 closely similar way as in Ps. africanus, so that a detailed description 

 seems unnecessary. Only it may be noted that in Ph. japoniens the 

 anterior margin of each radial calcareous segment is divided into two 

 halves which are subequal or slightly unequal in breadth (textfig. 

 5, a). 



iii. P seudo cucumis japoniens (Bell). 



Of this species BEDFORD [4, p. 844, figs. II, A — J'.J has given 

 diagrams showing size and arrangement of tentacles in the two 



original specimens. Should the blank spaces in his figure II, A 



the one in the midventral and the other in the left ventral radius 



be filled up each with a large tentacle, that figure will be made to 

 greatly resemble the diagram I have given below (textfig. 2). 



Of the several specimens of the species examined by me, all had 

 twenty-five tentacles, except a single abnormal case with twenty-six 

 of them. The large tentacles, ten in number, are disposed inter- 

 radially in five pairs (textfig. 2, D u V lt Ri and L^), with which 

 alternate singly standing medium-sized tentacles numbering five in all 

 (D 2 and R 2 ). The remaining ten small tentacles arc arranged in five 

 radially situated pairs (V 2 , D 3 , L, and R 3 ), forming an inner circle to 

 that of the other fifteen. The only difference from the previous cases 

 of species with twenty tentacles, lies in the addition of five small 



