266 



BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



longer than wide again. Side arm plates moderate, not meeting either 

 above or below; each plate carries six or seven long, slender, acute, 

 thorny spines, of which the lowest is very small, while the uppermost 

 or next is longest and at base of arm may equal fully four joints. 

 Tentacle pores very large, each with a single small tentacle scale which 

 may be lacking on the first one or two joints. Color (dried from 

 alcohol) , light wood-*brown, disk spines, arm spines, and keel on upper 

 arm plates white in marked contrast. 



FIG. 132. OPHIOTHRIX EUSTEIRA. X 8. 



a, FROM ABOVE; 6, FROM BELOW; c, SIDE VIEW OF TWO ARM 



JOINTS NEAR DISK. 



Locality. Ousima, Japan, William Stimpson, collector, 2 specimens. 



Type. Cat. No. 3319, U.S.N.M., from Ousima. 



There can be no question about the distinctness of this beautiful 

 species which has lain unnamed for half a century, in the collections 

 of the National Museum. The few, long, white arm spines, the long 

 under arm plates, and the long, strongly keeled upper arm plates are 

 striking features apart from the characters of the disk. It seems 

 strange that such a handsome and noticeable species should have so 

 long awaited description, and it is also rather remarkable that no 



