OPHITJEOTDEA FROM THE KOREAN" SEAS. 



479 



come out from the side of tlie arm. The arms are about tAvice 

 and a half as long as tlie diameter of the disk, which measures 

 -j^j- inch. 



Locality. Korean seas, on Ampliiura. Collected by Capt. St. 

 John E. 

 In the British Museum. 



lY. MemarTcs on the Species. 



The first species of Ophioglypha (0. Forhesi) described is very 

 anomalous from some points of great affinity to the genus OpJiio- 

 musiurn. The mosaic of the disk, the long almost connected 

 mouth-papillge, the meeting of the side arm-plates above and be- 

 low, and the small size of the upper and lower arm-plates would 

 connect the form with Lyman's genus Ophiovmsiim. But the 

 papilliferous radial scales and generative plates, and the presence 

 of a tentacle-scale and minute tentacle far out towards the tip, 

 are not characters of that genus. The species is aberrant from 

 the typical Ophioghjplia, on account of the oral structures espe- 

 cially ; and the disk scaling is to a certain extent abnormal. It 

 is an interestingTorm, for it throws a light on the value OpJiio- 

 musium as a genus. Its species as yet are remarkably widely 

 separated, and it must be acknowledged that its characters are very 

 embryonic. Por the literature of Ophio7nusium, see Bull, Mus. 

 Comp. Zool. Harvard Coll. Cambridge, U.S., vol. i. No. 10, page 

 322. See also Wyville Thomson, ' Depths of the Sea,' vol. i. 

 p. 172 ; ' Voyage of Challenger,' vol. ii. p. 67. 



Opliioglypha striata, so called from the remarkable groovings 

 on the side arm-plates, is also characterized by the structures 

 about the notch of the disk, and the curious shape and spinula- 

 tion of the first two or three upper arm-platcs. 



Ophioglypha sculpta is clearly an ally of O. Stiucitzi, and the 

 furrowing and dotting of some of the scales and plates is very cha- 

 racteristic. The spiny condition of the first upper arm-plate is 

 to be noticed. 



Opliioglyplia Sladeni is characterized by the accessory spine on 

 the body of the side arm-plate, by the numerous spines near the 

 disk and their irregular length, and the bossed disk scale. 



OpMoglypJia sinensis, Lyman. Numerous specimens of this 

 rather aberrant Opliioglyplia were dredged up. The scaling of the 

 disk diff"ers from that of all the other forms in the Korean seas. 



Opliiolepis mirahilis. This common species has the disk of 

 Opliiolepis as diagnosed by Miiller and Troschel, that is to say 



