NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 265 



though skin-covered) and slightly swollen, coarsely granular. Under 

 arm plates (fig. 13 le) widely separated, very much wider than long. 

 Arm spines about eight, rather short, slightly flattened at blunt, rough 

 tip. Tentacles large and very papillose (fig. 13 I/), therefore tentacle- 

 pores very large. Color (dried from alcohol), very pale fawn color. 



Locality. Albatross station 4876, Korea Strait, lat. 34 20' N. ; 

 long. 130 10' E., 59 fathoms, fine gray sand, broken shells, bottom 

 temperature 62.1, 3 specimens; station 4877, Korea Strait, lat. 34 

 20' 30" N.; long. 130 11' E., 59 fathoms, fine gray sand, broken 

 shells, 1 specimen. 



, Type Cat. No. 25644, U.S.N.M., from station 4876. 



Although this species is possessed of a number of distinctive 

 characters, I am in doubt as to the reliability of any of them. Thus 

 the disk spines differ from those of either Jcoreana or hylodes, but it is 

 not really an essential difference, and the coarse granulation of the 

 upper arm plates, very different from what is shown by the other 

 species, is probably not a distinctive peculiarity. So the conspicuous 

 spine-bearing tubercle on the first upper arm plate of each arm, may 

 not be a constant feature, and even if it is, similar, if not as con- 

 spicuous, tubercles occur in other species of Ophiofhrix. The complete 

 covering of the interbrachial spaces below helps to distinguish 

 panchyendyta from liylodes and most specimens of koreana, but not 

 from all! The arms of panchyendyta seem to be unusually short, but 

 as all are broken, it is not possible to reach a positive decision on the 

 point. As the general appearance of these specimens is quite unique, 

 they may well stand by themselves for the present. 



OPH1OTHRIX EUSTEIRA, new species, a 



Disk 9 mm. in diameter; arms about 60 mm. long, probably. 

 Disk with numerous, but not crowded, minute thorny stumps and at 

 center with a number of very long, slender, rough spines; there are 

 smaller, smoother spines between the radial shields and rarely in the 

 iiiterradial spaces. Radial shields very large, covering most of disk, 

 free from stumps and spines; interradial distance between two about 

 twice radial; lateral margins straight, distal margin concave. Upper 

 arm plates beyond first, rhombic, longer than wide, in contact and 

 strongly carinate. Interbrachial spaces below well covered with 

 minute stumps. Genital slits large. Oral shields very much wider 

 than long, rounded laterally. Adoral plates large, broader without 

 than within, where they meet. Tooth papilhe about thirty, rather 

 pointed, forming a high narrow oval group. First four or five under 

 arm plates, longer than wide, next five or six squarish, succeeding plates 



n Ei>, signifying trejf, and oretpa, signifying keel, in reference to the form of the 

 upper arm plates. 



