NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 189 



large, about three on a side and one at apex of jaw; long, flat, and 

 more or less pointed; outermost somewhat the largest. First under 

 arm plate hexagonal, much wider than long; second plate some- 

 what triangular, barely in contact with the first, wider than long; 

 succeeding plates separated, much wider than long, nearly tetragonal, 

 but the sides are not straight ; proximal margin with a slight median 

 point and distal, with a shallow median notch. Side arm plates large, 

 meeting below but hardly above on basal part of arm; each plate 

 carries eight sharp, slender spines, of wliich the upper ones are smooth, 



C 



FIG. 87.- -OPHIOMITRA CODONOMOKPHA. x 4. a, PROM ABOVE; 6, FKOM BELOW; c, SIDE VIEW OF TWO 



ARM JOINTS NEAR DISK. 



the others (except the lowest) being rough or thorny; the next to the 

 uppermost is longest, considerably exceeding the joint. Tentacle 

 scale single ; on first arm pore the scale is rounded oval and relatively 

 enormous, but the succeeding scales are much smaller and are soon 

 narrow and pointed. Color (dried from alcohol), light gray. 



Locality. Albatross station 4979, off eastern Japan, lat. 33 53' N.; 

 long. 137 42' E., 943 fathoms, brown mud, fine sand, foraminifera, 

 bottom temperature 36.4, 1 specimen. 



'Type.C&t. No. 25603, U.S.N.M., from station 4979. 



