226 



BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



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

 hardly meetmg within. Oral papillae very long, stout, pomted, 

 tliree 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; up})e"r 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- 



FlG. 105.— OPHIACANTHA EUPH-ST.ACTEA. X 7. O, FROM ABOVK; b, 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 tliree 

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



Locality. — Albatross station 3697, off ]\Ianazuru Zaki, Honshu 

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

 specimen. 



3Vpe.— 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 



