THE SYSTEM OF PHYLLOPHORIN^E. 



77 



Type. — P. acicula (Semper). 



Ludwig at first limited the tentacle number of the genus to 

 twenty ; later he made the genus to comprehend forms with from 

 eighteen to thirty tentacles, and finally those which have more than 

 fifteen tentacles of unequal size. 



On the basis of my view on the system of Phyllophorina?, I 

 propose to change the generic diagnosis with regard to the number of 

 tentacles and the distribution of pedicels. Since in my opinion Orcula 

 discrepans and 0. cucumiformis should be referred to Pseudocucumis, 

 while P. japonicus as well as P. interccdens should be removed from 

 it, the genus may be defined as follows : — 



Tentacles in two orders : 1 5 — 20 in number, unequal in size. 

 The smaller tentacles stand as a rule alternately with the larger ones, 

 all or a part of the former forming an inner circle of tentacles. 

 Pedicels limited to ambulacra, but sometimes scattered in a few 

 number on interambulacra also. 



2. Pseudocucumis africanus (Semper). 



(Pl. I., fig. 4; textfigs. I and 4). 

 Cucumaria africana SEMPER, 186S [42], P- 53- 

 Cîicumaria assimilis Bell, 1886 [6], p. 27. 

 Pseudocucumis theeli LUDWIG, 1887 [24], p. 1236. 

 Pseudocucumis africana LUDWIG, 1888 [25], P- 815.— MiTSUKURl, 

 MS. [32]. 



Besides the numerous specimens from Kyüshü and Riü-Kiü 

 Islands, which were studied by the late Professor MiTSUKURl, I have 

 two specimens from Takanoshima in the Bay of Tateyama in Province 

 Awa, lat. 34 59' N., long. 139 51' E. (Sci. Coll., Spec. No. 1737). 

 This is the northernmost locality known for the species. They were 

 collected by Mr. K. KAWAGUCHI on July 30, 1910. 



The two specimens measure in length respectively 32 mm. and 

 25 mm., both with the introvert in well extended state (Pl. I., fig. 4). 



