106 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



others. The difference between the two species in the nature of the 

 disk scales is also very constant. It is interesting to find two such 

 closely allied, yet very distinct species, occupying the same area. 



OPHIOMUSIUM CANCELLATUM. 



Ophiomusium cancellatum LYMAN, Bull. Mus. Comp. Zool., vol. 5, 1878, p. 111. 



Localities. Albatross station 3718, off Ose Zaki, Japan, 65 fathoms, 

 volcanic sand, shells, rocks, 1 specimen; station 3738, off Port Heda, 

 Japan, 168 fathoms, stiff blue mud, 1 specimen; station 4928, in 

 Colnett Strait, lat. 29 51' N.; long. 131 2' 30" E., 1,008 fathoms, 

 gray sand, globigerina, bottom temperature 36.8, 3 specimens; 

 station 4959, off eastern Japan, lat. 32 36' 30" N. ; long. 132 23' 20" 

 E., 405 to 578 fathoms, green-brown mud, fine gray sand, foraminifera, 

 1 specimen; station 4965, off eastern Japan, lat. 33 35' 20" N. ; long. 

 135 10' 50" E., 191 fathoms, dark green-gray sand, shells, bottom 

 temperature 49.4, 4 specimens; station 5059, Suruga Gulf, Japan, 

 lat. 35 5' 30" N.; long. 138 39' 50" E., 197 to 297 fathoms, gray 

 sand, bottom temperature 45, 1 specimen; station 5079, off Omai 

 Saki, lat. 34 15' N.; long. 138 E., 475 to 505 fathoms, pebbles, bot- 

 tom temperature 39.1, 1 specimen; station 5088, Sagami Bay, lat. 

 35 11' 25" N.; long. 139 28' 20" E., 369 to 405 fathoms, green mud, 

 bottom temperature 41.8, 2 specimens; station 5091, Uraga Strait, 

 lat. 35 4' 10" N.; long. 139 38' 12" E., 197 fathoms, green mud, 

 coarse black sand, pebbles, bottom temperature 47.6, 2 specimens. 

 Bathymetrical range, 65 to 1,008 fathoms. Temperature range, 49.4 

 to 36.8. Sixteen specimens. 



These specimens range in diameter of disk from 5 to 16 mm., and 

 are therefore both larger and smaller than Lyman's type. They show 

 considerable diversity in the form of the oral shields, the length of the 

 arm spines and in other details, but on the whole, they agree so well 

 with Lyman's description and figures, I feel no doubt of their identity. 

 The number of arm spines in young specimens is often only three or 

 two, even at the base of the arm. Although apparently not a very 

 common, or widely distributed form, this species has a notable bathy- 

 metrical range. 



OPHIOMUSIUM LAQUEATUM. 



Ophiomusium laqueatum LYMAN, Bull. Mus. Comp. Zool., vol. 5, 1878, p. 113. 



Localities. Albatross station 4934, Eastern Sea, lat. 30 58' 30" N.; 

 long. 130 32' E., 103 to 152 fathoms, rocky, bottom temperature 56 

 to 60.6, 1 specimen; station 4936, Eastern Sea, lat. 30 54' 40" N.; 

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

 1 specimen. Bathymetrical range, 103 to 152 fathoms. Tempera- 

 ture range, 60.6 to 56. Two specimens. 



These specimens agree well with Lyman's description and figures. 

 One is 13 mm., the other 18 mm., across the disk. In both, the arms 



