NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 205 



arm plate wider than long, in contact with second, which is corre- 

 spondingly he])tagonal; succeeding plates hexagonal, separated, at 

 first wider than long but rapidly becoming longer than wide; at 

 middle of arm the under arm plates are so encroached on by the huge 

 tentacle scales that their length may be nearly twice their least 

 breadth. Side arm plates large, meeting both above and below; 

 each plate carries about nine (seven to eleven indifferent specimens) 

 long, smooth spines, of which the second or third (from above) is 

 the longest, and may equal four joints. Tentacle scale single, very 

 large, often as long as the under arm plate, or nearly so, more or less 

 pointed. Color (dried from alcohol), very light brown. 





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Fig. 95.— Ophiacantha anchilahka. >: d. u, from auove; 6, from helow; c, side view of two 



ARM JOINTS NEAR DISK. 



Localities. — Albatross station 4!)71 , off eastern Japan, lat. 33° 2;V 30" 

 N.; long. 135° 34' E., 649 fathoms, brown-green mud, foraniinifera, 

 bottom temperature 38.1°, 1 spechnen; station 5()S4, off Omai Saki 

 Light, hit. 34° N. : long. 137° 40' 40" E., 918 fathoms, green mud, fine 

 sand, globigerina, bottom temperature 36.8°, o specimens. 



Type.— Cat. No. 25654, U.S.X.M., from station 5084. 



Although this species is nearly related to pentagona and its allies, 

 it is easily distinguished from that group by its nuich broad(>r antl 

 stouter arms, and its longer and thicker oral ])apilla'; the long under 



