OPHITJEOIDEA FEOM THE KOEEAN SEAS. 



467 



comers curved and constricted at the jaw ; tlie next is broad, 

 curved, and often produced into a sliglit spine, and the outer one 

 is broader, short and thin, like a ridge ; and by its junction 

 with that of the next angle, a sharp margin is formed as a boun- 

 dary to the jaw space. 



The first lower arm-plate is small, and the others are about as 

 broad as long, broadest without, where the edge is faintly incurved, 

 and angular within, where the edge is sliort from the incoming of 

 the large side arm-plates. The side near the distal end is straightish 

 and bears a tentacle-scale, and tlien it slopes inwards orally. 

 Towards the end of the arm the plates are small, longer than 

 broad, curved without, and more angular within, and are sepa- 

 rated by the side mouth-shields. 



The upper arm-plates are short, large, convex from side to side, 

 much broader than long ; they are strongly curved within, and 

 nearly straight aborally, and towards the end they become sepa- 

 rate and more pointed orally. 



The side arm-plates are w^ell developed, and have a thin inferior 

 process between the under arm-plates, and a larger, which extends 

 on the upper arm : they begin to encroach soon, and are in con- 

 tact, at the tip of the arm, separating the lower plates. They pro- 

 ject very slightly, and three short, slender, sharp spines arise 

 from the free edge ; these are smaller at the base, thin, slender, 

 round in transverse outline, and are about the length of an arm- 

 plate. A large tentacle-scale, rounded and broad, is on each side 

 arm-plate, and is in contact with that of the lower arm-plate. 

 The colour is white ; the arms are curled downwards, and their 

 length is about twice that of the diameter of the disk. 



Locality. Korean Straits, 37 fathoms. Collected by Capt. 

 St. John, E.N. 



In the British Museum. 



Genus Hemipholis, Agass. 



Hemipholis miceodisctjs, sp. nov. Plate X. figs. 20, 21, 22. 



The disk is small, constricted at the interbrachial spaces ; and 

 the arms, about eight times as long as the diameter of the disk, 

 are long and tapering. The upper surface of the disk has thin 

 overlapping scales of several sizes, and there are faint indica- 

 tions of a rosette. A numerous series of smaller scales is in the 

 midst of the interbrachial space above, and there are smaller ones on 

 either side ; and five radiating lines of longish scales pass between 



34* 



