NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 275 



or less skin-covered. Tentacle pores very large but tentacle scales 

 none. Color (dried from alcohol), disk, deep brown, arms yellowish 

 or dirty whitish. 



Localities. — Albatross station 3071, off Washington, lat. 47° 29' N.; 

 long. 125° 33' 30" W., 685 fathoms, green mud, bottom temperature 

 38°, 1 specimen; station 3347, off Washington, lat. 45° 9' 35" N.; 

 long. 124° 45' W., 345 fathoms, mud, bottom temperature 40.9°, 

 1 specimen. 



Type.— C&t. No. 25607, U.S.N.M., from station 3347. 



It is unfortunate that both of the specimens are badly damaged, 

 the disk being entirely gone in the smaller specimen and more than 

 three-fifths gone in the larger. In spite of this defect, however, the 

 larger specimen shows its unique characters very clearly, so that I 

 have not hesitated to base the new species and genus upon it. Most 



Fig. 138.— Ophiocynodus corynetes. X 2. a, from above; 6, from below; c, side \iew of two 



ARM JOINTS NEAR DISK. 



of the lower arm spines are much more conspicuously clubbed and 

 thorny at the tip than is shown in the figures. Better si)ecimens 

 may reveal scales present in the skin of the disk. 



OPHIOSYZYGUS, new genus. « 

 Disk covered with skin in which are embedded, at least near margin, 

 numerous minute delicate scales, on which are borne larger calcare- 

 ous granules. Radial shields, upper arm plates, and tentacle scales 

 wanting. Arm spines few, with upper ones successively united to 

 each other by a broad, thin, horizontal membrane. Teeth reduced 

 to cluster of few, minute, rough spinelets at apex of jaw. Oral 

 papillae small and few, but distinct, not like teeth. 



a''0<l)io and aul^urof, signifying joined together, in reference to the uniting of the arm 

 spines by membrane. 



