246 



BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



broken shells, pebbles, sand, 2 specimens; station 4781, off AgattU 

 Island, lat. 52 14' 30" N.; long. 174 13' E., 482 fathoms, fine 

 gray sand, pebbles, bottom temperature 38.6, 8 specimens; station 

 4784, off Attu Island, lat. 52 55' 40" N.; long. 173 26' E., 135 

 fathoms, coarse pebbles, 7 specimens. Bathymetrical range, 54 to 

 482 fathoms. Temperature range, ? to 38.6. Twenty-one specimens. 



TypeC&t. No. 25721, U.S.N.M., from station 3599. 



Although the type of this species comes from the same station 

 where that of tylota was taken, the two species are so unlike they 

 can not be confused. Specimens of diaphora show great diversity 

 in the number of disk granules and arm spines, in the size and form 

 of the radial shields, which may be quite small and indistinct in 



FIG. 119. OPHIOLEBES PAUCISPINA. X 7. a, FROM ABOVE; ft, FROM BELOW; c, SIDE VIEW OF TWO 



ARM JOINTS NEAR DISK. 



small specimens, and in the degree to which the plates and the 

 lower arm spines are swollen, but their identification is rarely diffi- 

 cult. Young specimens might, however, be confused with the next 

 species, owing to their having only four or five arm spines and few 

 disk granules. 



OPHIOLEBES PAUCISPINA, new species.a 



Disk 7 mm. in diameter; arms about 22 mm. long. Disk covered 

 with coarse, thick scales, some of which bear rounded granules. 

 Radial shields moderate, rounded, well separated from each other. 

 Upper arm plates thick and more or less swollen, rounded, triangular 

 or rhombic; except first two, separated from each other. Inter- 



" Pauci, signifying few, and spinus, signifying a spine, in reference to the small 

 number of arm spines. 



