188 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



scales like those of the disk. Genital slits long. Oral shields rhombic, 

 about as long as wide. Adoral plates very large, tetragonal, meeting 

 broadly within; oral plates moderate. Oral papillae about six on a 

 side and one at apex of jaw; they are long, flat, and somewhat spatu- 

 late, the outer ones the widest. First under arm plate, tetragonal, 

 wider than long; succeeding plates somewhat hexagonal, about as 

 long as wide; basal ones in contact or at least overlapping. wSide 

 arm plates rather large, meeting broadly above, but only narrowly 

 below, or not at all near base of arm; each plate carries nine or ten 

 long, slender sharp arm spines, of which the highest (first) and lowest 

 are shortest and the second or third the longest; the lowest and the 

 upper two or three are smooth, the others more or less prickly; the 

 longest spines are ecpial to three or more joints. Tentacle scale single, 

 oval but pointed, relatively huge, especially at base of arm. Color 

 (dried from alcohol), very pale yellowish-brown. 



Locality. —Alhatross station 4936, Eastern Sea, lat. 30° 54' 40" N.; 

 long. 130° 37' 30" E., 103 fathoms, stones, bottom temperature 60.6°, 

 3 specimens. 



Type.— Ceit. No. 25631, U.S.N.M., from station 4936. 



This is a remarkably well-characterized species, the numerous long 

 arm spines, the huge tentacle scales, the numerous oral papillae, the 

 small radial shields and upper arm plates, and the very large adoral 

 plates giving it an unique appearance. The thorny stumps on the 

 disk are curiously expanded at the tip, unlike those of any OpJiiomitra 

 with which I am acquainted. 



OPHIOMITRA CODONOMORPHA, new species.i 



Disk 13 mm. in diameter; arms about 65 mm. long, probably. 

 Disk with very slight interradial grooves, covered with scales, the 

 largest of which are between the radial shields (radially) and the 

 smallest are along the interradial grooves ; a few of the scales near 

 center of disk carry each a minute, low, rough projection. Radial 

 shields large, oval, longer than wide, so far separated that the inter- 

 radial distance between two scarcely exceeds the radial. P^irst upper 

 arm plate elliptical, much wider than long; succeeding plates dis- 

 tinctly bell-shaped, about as wide as long, scarcely in contact; more 

 or less noncalcified skin is visible among the basal plates of the arm. 

 Interbrachial spaces below covered by rather numerous scales. Geni- 

 tal slits short and wide. Oral shields much wider than long, some- 

 what triangular, with a wide distal and two lateral angles, but the 

 proximal base also tends to form a wide angle between the two adoral 

 plates, which are nearly horizontal, and are a little narrower without 

 than within where they meet; oral plates moderate. Oral papillae 



a Kcbdajv, signifying bell, and fiop(j)rj signifying shape, in reference to the peculiar 

 upper arm plates. 



