226 



BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



angle, much broader than long. Adoral plates - short and wide, 

 hardly meeting within. Oral papillae very long, stout, pointed, 

 three or four on a side, subequal, and a larger one at apex of jaw. 

 First under arm plate very large, squarish, about as long as wide; 

 succeeding plates squarish or hexagonal, wider than long, broadly 

 separated from each other. Side arm plates moderate, well sep- 

 arated above, but meeting broadly below. Each plate carries six 

 to eight short, thick, bluntly pointed arm spines; upper ones smooth, 

 second and third longest, not quite equal to two joints; lowest three 

 or four smaller (much smaller at middle of arm), more or less flat- 



FIG. 105. OPHIACANTHA EUPHYLACTEA. X 7. a, FROM ABOVE; 6, FROM BELOW; c, SIDE VIEW OF TWO 



ARM JOINTS NEAR DISK. 



tened, rough, and hooked at tip. Tentacle scales none, but the 

 three or four lowest arm spines form a very efficient protection for 

 the tentacles, which are, however, except the first two or three 

 pairs, very small. Color (dried from alcohol), whitish. 



Locality. Albatross station 3697, off Manazuru Zaki, Honshu 

 Island, Japan, 120 to 265 fathoms, gray mud, volcanic sand, 1 

 specimen. 



Type. Cat. No. 25730, U.S.N.M., from station 3697. 



Although the single specimen shows the effect of acid alcohol, by 

 a certain amount of decalcification, which is most marked on the 



