OPHIUROIDEA FROM THE KOREAN SEAS. 



455 



The tentacle-opening nearest the mouth-angle is large, oblique, 

 and linear, and there is a margin of about from ten to twelve 

 short and broad, blunt, lamellar tentacle-scales, one half being on 

 the lower arm-plate. The next opening has about six scales on 

 the side arm-plate ; and so has the third. The tentacle-scales 

 gradually merge into ordinary spines along the edge of the suc- 

 ceeding side arm-plates, and gradually become fewer and fewer. 



The diameter of the disk between opposite interbrachial spaces 

 is inch, and the length of the arm is about -fij inch. 



Localifi/. Sondai Bay, Korean Sea. Collected by Capt. 

 St. John,' E.N. 



In the British Museum. 



OpniOGLTPnA scuLPTA, sp. nov. Plates IX. & XI. figs. 6, 7, 

 8, & 35. 



The body is thick, pentagonal in outline, with well-marked slits 

 for the arms, which are broad and high near the disk, tapering 

 and short, being never more than once and a half the length of 

 the diameter of the disk. 



The upper surface of the diskis covered with large, medium-sized, 

 and a very few small, overlapping, stout, rather tumid scales, which 

 are often marked with minute dot-like cavities, and with short 

 straight furrows close to the edge. A central rosette is formed 

 of six, close, large plates, without any others intervening ; the cen- 

 tral plate, somewhat irregular in shape, is not overlapped. There 

 are two large scales placed radially, w^hich reach from the rosette 

 to the edge of the disk in each interbrachial space ; and three 

 small scales, running parallel with the rosette, reach from it to the 

 proximal separation of the radial shields, into which the central 

 one fits. Tlie radial shields are small, irregular in shape, are much 

 overlapped, and are largest and broadest at the notch without ; they 

 are united and even overlap for a short space, and are narrow 

 within. They are tumid, rounded oflP, and marked with pits. 



The interbrachial spaces are large, slightly re-enteringly curved, 

 and slope inwards and downwards. They are covered by numerous, 

 small, very projectiug, tumid scales in mosaic, and aremuch furrow^ed 

 from side to side. A comb of very small, sharp, slender spinules 

 is on the radial scale on either side of the notch, and it is conti- 

 nuous below with a spined edge of a generative plate. There arc 

 about twenty to twenty-four spinules. 



The mouth-shields are small, longer than broad, very prolonged 

 and angular within, and broad and nearly circular without : there 



