100 ART. 2. — H. MATSUMOTO : 



One specimen ; Mera-out-Oisegaké, Sagami Sea ; 350 fathoms. 

 One specimen ; off Osliima ; 90-100 fathoms. 



Off Suno Saki, Sagami Sea ; 83-158 fathoms (Clakk). 



Though the radial shields are externally invisible, they have 

 been proved to be present by dissection, and are very small, short, 

 bar-like, widely separated from each other. My specimens also 

 invariably show an indication of schizogony, for they are six- 

 armed, three arms being distinctly smaller than the other three. 



Ophiophruva liodisca (Clark). 



Opldophrura liodisca : Clark, Biül. U. S. Nat. Mus., LXXV, 1911, p. 

 249, fig. 121. 



Off Omai Saki, Yenslni Sea ; 475-505 fathoms (Claek). 



Ophiopora wegatrenia (Clark). 



OpUacantha megatrcma : Clark, Bull. U. S. Nat. Mus., LXXV, 1911 

 p. 287, fig. 113. 



Off eastern Japan ; 587-943 fathoms (Clark). 



As stated by Kœhlee, Ophiopora and Ophiotrema are closely 

 related to each other. All the members of these genera, i.e. 

 Ophiopora hartlelil (Lyman, 1883), 0. paucispina (Lütken & 

 MoKTENSEN, 1899), the present species and Ophiotrema alberti 

 Kœhler, 1894, have visible disk scales, large adorai shields, which 

 separate the oral shields from the first lateral arm plates, narrow 

 oral angles, gaping oral slits, very large tentacle pores and distally 

 notched ventral arm plates. I look upon the present species to 

 be an Ophiopora standing next to Ophiotrema, because the distal 

 oral papilla) are differentiated in size from the inner ones, quite 

 like those of Ophiotrema, while the total absence of tentacle scales 

 is a character of Ophiopora. 



