8 4 



HIROSHI OIISIIIMA : 



by diesiate Professor MiTSUKURl as well as on four more specimens 

 collected by Dr. M. MlYAJIMA at Naha on May 25, 1900 (Sci. Coll., 

 Spec. No. 1747), differ in some respects — above all in regard to the 

 tentacle number and the calcareous deposits — from the above cited 

 statements. They may be given as follows : — 



Form and size. — -All specimens are much contracted, eviscerated 

 and have introvert drawn in. The least contracted of them is shown 

 in Pl. I., fig. 3. This is of a somewhat cylindrical shape, but is 

 strongly curved. Its length is 57 mm. along the middorsal line and 

 91 mm. along the midvcntral ; greatest diameter 16 mm. In all 

 other strongly contracted specimens the body is spindle-shaped. 



Integument. — Muscular, quite soft to the touch. 



Tentacles.- — Invariably twenty in number. The largest ten 

 tentacles 12 — 18 mm. long in the contracted state; the medium- 

 sized five tentacles 5 — 8 mm. long; the l smallest five tentacles radial 



Textfig. 6, 



Pliyllophorns fragilis Mitsukuri & Ohshima, sp. n. a Three consecutive 

 segments of the calcareous ring seen from abaxial side. l> — e Various forms of 

 tables from general perisome and pedicel, viewed from above ; / — g same seen 

 from side, h Perforated plate situated near the end-plate, i Supporting rods 

 of tentacle, [a x 3, I — i x 300). 



