336 ART. 2. — IL MATSUMOTO : 



The largest one of my specimens is 5 mm. across the disk, 

 with the arms four or five times as long. The apical pair of oral 

 papilla? are infradental, and there is no unpaired papilla. The 

 arms are lightly keeled both above and below, so that they 

 remind us of Ophioc.hiton. There are two or three scale-like sup- 

 plementary plates between the lateral arm plates ; but they are 

 not very conspicuous, being covered over by the arm spines. In 

 smaller specimens, the disk squamation much resembles that of 

 Ophioiona and Ophiozonelld. 



Ophionereis euvyhvachiplax Clark. 



OpMonercis euryhracJdplax : Claek, Bull. U. S. Nat. Mus., LXXV, 

 1911, p. 173, fig. 78. 



Off Kinkwa San ; 31-41 fathoms (Claek). 

 California. 



Ophionereis sinensis (Duncan). 



Ophionereis dubia var. sinensis : Duncan, Journ. Liuu. Soc. London, 

 XIV, 1879, p. 464. 



Korea Strait ; 33 fathoms (Duncan). 



This species is very imperfectly described by Duncan as a 

 variety of 0. dubia (Müllee & Teoschel, 1842). His remarks 

 read as follows. 



" The form from the Korean Sea is well grown, and differs 

 from the type {0. dubia) as follow: — The lower arm-plates have 

 a median notch and eminence ; the spines are subequal, and they 

 are rarely banded with colour. It has a marsupium, and doubtless, 

 as was commonly the case in these Korean species, it is vivip- 

 arous." 



