254 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



after the third well separated and with very indistinct outlines. Side 

 arm plates rather large, not quite meeting either above or below; 

 each plate carries three solid, flattened, serrate or rough, bluntly 

 pointed arm spines, of which the middle one is longest and slightly 

 exceeds a joint; base of spine white and opaque, like side arm plate, 

 but remainder glassy. Tentacle pores very large, but no tentacle 

 scales. Color (dried from alcohol), disk dark greenish, radial shields 

 pure white, arms and oral surface, whitish. 



Locality. Albatross station 4919, Eastern Sea, lat. 30 34' N.; 



C 



FIG. 124. OPHIOSTYRACIUM TRACHYACANTHUM. X 9. a, FROM ABOVE; b, FROM BELOW; c, SIDE VIEW 



OF THREE ARM JOINTS NEAR DISK. 



long. 129 19' 30" E., 440 fathoms, globigerina ooze, oottom tem- 

 perature 41.8, 1 specimen. 



Type. Cat. No. 25733, U.S.N.M., from station 4919. 



This individual is well preserved and its remarkable features stand 

 out distinctly, so that one wishes more than usually that a good series 

 were available. 



OPHIOSCHIZA, new genus." 



Disk covered with irregular plates and large radial shields. Upper 

 arm plates wanting, except one or two rudimentary ones at base of 



-"0<})co and o%^a, signifying crack, slit, in reference to the single genital slit in each 

 interradius. 



