140 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



each one carries five or six short, thick arm spines, of which the upper- 

 most is longest and equals the joint. First tentacle pore with two 

 scales; succeeding pores with single, large, oval scales. Color (dried 

 from alcohol), brown, the terminal portions of the arms faintly 

 banded or variegated with a lighter shade. 



Locality. Tanegasima, Japan (North Pacific Exploring Expedi- 

 tion), three specimens. 



Type. Cat. No. 3324, U.S.N.M. 



The smallest specimen has the disk less than 3 mm. across. It has 

 only four arm spines, a single oral papilla on each side, and short 

 radial shields, so that it resembles the type of bracliyaspis quite 

 strongly, but the shape of the arm plates and particularly the form 

 and arrangement of the oral shields and adoral plates make it im- 

 possible for me to regard the two as identical. The six stout arms, 

 small disk, naked interbrachial spaces, characteristic arm plates 

 and oral shields, two or three oral papillae, and six arm spines will 

 serve to distinguish gymnochora from other species of Opkiactis 

 without difficulty. 



AMPHIURA BELLIS. 



Amphiura bellis LYMAN, Bull. Mus. Comp. Zool., vol. 6, 1879, p. 19. 



Localities. Albatross station 3697, off Manazuru Zaki, Honshu 

 Island, Japan, 120 to 265 fathoms, gray mud, volcanic sand, 2 speci- 

 mens; station 3707, off Ose Zaki, Honshu Island, Japan, 63 to 75 

 fathoms, volcanic sand, ashes, gravel, 1 specimen; station 4971, off 

 eastern Japan, lat. 33 23' 30" N.; long. 135 34' E., 649 fathoms, 

 brown-green mud, foraminifera, bottom temperature 38.1, 1 speci- 

 men; station 5083, off Omai Saki, Japan, lat. 34 4' 20" N. ; long. 137 

 57' 30" E., 624 fathoms, fine gray sand, globigerina, bottom tempera- 

 ture 38.1, 1 specimen. Bathymetrical range, 63 to 649 fathoms. 

 Five specimens. 



These specimens agree admirably in all particulars with Lyman's 

 description and figures. The largest specimen is 11 mm. across the 

 disk, but one of the others, which now has a pentagonal disk, with 

 deeply concave sides, 7 mm. across, was formerly nearly 13 mm. 

 across the disk, as shown by the condition of the base of the arms. 

 It is an unusually interesting example of disk-shedding followed by 

 regeneration. 



AMPHIURA DIOMEDE^E. 



Amphiura dwmedex LUTKEN and MORTENSEN, Mem. Mus. Comp. Zool., vol. 23, 

 1899, p. 151. 



Localities. Albatross station 3696, off Manazuru Zaki, Honshu 

 Island, Japan, 501 to 749 fathoms, green mud, volcanic ashes, sand, 

 9 specimens; station 3697, off Manazuru Zaki, Honshu Island, Japan, 

 120 to 265 fathoms, gray mud, volcanic sand, 1 specimen; station 



