7 6 



HIROSIII OHSH1MA : 



a number of such abnormal retractors from my own observations in 

 some other polychirotous forms. The attenuation of the hinder end 

 and the thick integument of the anterior body end in Bell's specimens 

 are, I suppose, merely due to the state in which the specimens were 

 killed. Genital tubes filling the greater part of body-cavity in a 

 large number can scarcely be taken for a matter of specific im- 

 portance as Bell has considered it to be. In my specimens the 

 number of tubes and their thickness vary very much according to 

 sex as well as to the season of capture. 



After all I have said, the diagnosis of the present species may 

 be emended as follows : — 



Body cylindrical, truncate or tapering at both ends. Body 

 length may exceed 50 mm. General perisome greyish brown, tip of 

 pedicels light brown, tentacles and introvert white. Tentacles twenty- 

 five in number, in three different sizes; the largest ten standing in 

 five pairs which alternate with the medium-sized five, these being 

 radially situated. The small ten tentacles arranged painvise on each 

 radius, forming inner circle of tentacles. Pedicels limited to am- 

 bulacra, arranged in a zigzag row or in 2 — 4 rows. Integument soft, 

 usually without any calcareous deposit. Tables with spire made up of 

 two pillars are found in the introvert. End-plate of pedicels as well as anal 

 teeth present. Tentacles supported by recurved or branching rods. 

 Calcareous ring weakly calcified ; radial segment with four unequal 

 anterior notches, but without posterior prolongations ; interradial seg- 

 ments slender, of the form of inverted Y. Polian vesicle usually single, 

 hanging in the left dorsal interradius, but often with an accessory vesicle 

 in the left ventral interradius. Stone-canal provided with reniform 

 madreporite. Genital tubes once or twice branched, in two tufts. 



Genus Pseudo cucumis Ludwig. 



Pseudociiaimis Ludwig, 1874 [20], p. 14- — 1886 [23], P- 27. — 1887 

 [24], p. 1 24 1. 



