NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 261 



The lari2;est specimen (fig. 127) has almost no trifid stumps, but 

 numerous rough disk spines of very variable length. In' fig. 128a 

 is shown one of the most interesting varieties, a specimen from 

 station 5055; in this individual the disk stumps have very long 

 thorns, usually only two, and these are united to each other by a 

 membrane; there are no disk spines; the arm spines are unusually 

 slender and the upper arm plates are unusually long, somewhat 



FlO. 12S.— OPHIOTHRIX KOREANA. 0, PART OF SPECIMEN FROM STATION 5055, FROM ABOVE, X 0; b, PART 

 OF SPECIMEN FROM STATION 4878, FROM ABOVE, X 8. 



pentagonal with distal angle rounded and proximo-lateral sides 

 longest and concave, rather tha^n straight; the disk is nearly white, 

 the arms very pale brown, with a broad longitutlinal white stripe 

 bordered on each side with reddish, faintly indicated on upper side 

 of arm. Another interesting specimen, taken at station 4878, is 

 shown in fig. 12S&; this individual has extraordinarily long and 

 prominent disk spines and the color of the disk is unique, uniform 



