84 



BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



fathoms, volcanic sand, shells, rocks, 6 specimens; station 3716, off 

 Ose Zaki, Japan, 65 to 125 fathoms, volcanic sand, shells, rocks, 

 5 specimens; station 4807, Sea of Japan, lat. 41° 36' 12" N.; long. 

 140° 36' W., 44 to 47 fathoms, shells, coarse gravel, 1 specimen; 

 station 4874, Korea Strait, lat. 34° 38' N. ; long. 130° 3' E., 66 fathoms, 

 green sand, broken shells, 1 specimen; station 4933, off Kagoshima 

 Gulf, lat. 30° 59' N. ; long. 130° 29' 50" E., 152 fathoms*^ rocky, 

 bottom temperature 56°, 1 specimen; station 4934, off Kagoshima 

 Gulf, lat. 30° 58' 30" N.; long. 130° 32' E., 103 to 152 fathoms, rocky, 

 bottom temperature 56°, 4 specimens. Bathymetrical range, 44 to 

 152 fathoms. Twenty-two specimens. 



Tyjye.— Cat. No. 25728, U.S.N.M., from station 4807. 



This species resembles sterea so closely that viewed simply from 

 above it can not be distinguished with certainty, although the upper 

 arm plates are somewhat different. But a glance at the arm spines is 

 sufficient to enable one to separate the two species without fail. 

 The secondary arm spines of stiphra are so fidly differentiated into a 

 marginal fringe and are so sharply distinct from the true spines that 

 the general appearance is quite unlike that of sterea. 



OPHIURA PENICHRA, new species.a 



Disk 24 mm. in diameter; arms about 70 mm. long. Disk high, 

 about 7 mm. thick, covered by a close, smooth coat, of rather less 



Fig. 26.— Ophiura pknichra. X- 



a, FROM above; 6, from below; c, side view of three arm 



JOINTS NEAR DISK. 



than one hundred scales, among which the primary plates are not 

 always distinguishable, but the radial shields are conspicuous. 

 Radial shields rather longer than wide, united for about two-thirds 

 of their length, inner ends diverging. Arms high, compressed, and 

 faintly keeled at base. Upper arm plates tetragonal, much wider 

 than long, gradually becoming hexagonal and ultimately, longer than 

 wide, in contact nearly to tip of arm. Interbrachial spaces below 

 mostly covered by oral shield and three elongated plates distal to it. 



« Usvcxpoc, signifying foor, needy, in reference to the depauperate arm spines. 



