K. MITSUKUKI : STUDIES ON 



Textfig. 8. 



Bathyplotes iizardi : «-Radialia of calcareous fing ; h, c — Tables from iiosterior region ; 

 d, e — Same of ventrura ; /, f/ — C-shapecl bodies; /i— Supporting rod. (h — /tx300). 



have a rather large mamma- shaped base, from tlie top of which 

 a slender papilla arises. These slender parts are 5 —6 mm. long 

 in their present contracted state. 



Mouth ventral ; anus subdorsal or terminal. Tentacles 18, 

 sometimes only 15. (»enital bundles two. Tohan vesicle one, large 

 and long (1 cm.). In one specimen I made out radiaha in the cal- 

 careous ring to be of the shape shown in textfig. 8 a. Interradialia 

 and stone-canal not made out. Longitudinal muscles undivided. 



The calcareous deposits consist of cross-shaped tables and 

 C-shaped Ijodies together with supporting rods. The tables in the 

 posterior parts of the body are very robust and thick, measuring 

 0.17 — 0.23 mm. in diam. [h, c). They are rarely five-radiate. 

 Spires thick and short, and luive a crown-like enlargement, which 

 in some cases seem to be without any central o[)ening. The 

 tables of the \ entrai surface are ordinarilv the smallest in the 



