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178 



THE OPIIIURlDiE. 



curved, sometimes with a little median peak; inner sides concave, corners 

 sharp ; about twice as broad as long. Side mouth shields curved, broader 

 within than without, meeting within. 



First ventral plate small, outer edge convex, inner edge concave. The 

 second sometimes in contact with the first, sometimes separated from it; 

 those beyond all widely separated, twice as broad as long. There is a very 

 obtuse angle within, the inner laterals forming an almost straight line across 

 the arm ; the outer edge has a little rounded peak on each side of the 

 median line, rather complicately curved (Fig. 9) ; sometimes it is simply 

 curved, with a more or less deep cut in the median line; outer corners 

 rounded, outer laterals straight, inner laterals of the second plate re-enter- 

 'ingly curved, on those beyond slightly sigmoidly curved. Side arm-plates 

 with spine-ridge very prominent. Sometimes the median end on the ventral 

 side of the first side arm-plates is cut off as a little separate piece. Dorsal 

 plates triangular with all sides curved; broader than long. The two inner 

 ones in contact, with inner angle truncated. Arms not much knotted, the 

 under side very flat or hollowed, with a feeble keel along the median line. 



Disk beset with coarse c. 0.2-3 mm. long grains (Fig. 12), which do not 

 hide the scaling. The radial shields uncovered, triangular, in contact at 

 their outer end ; scarcely longer than a third of the radius of the disk. 

 There is a row of grains along their outer edge ; also along the outer edge 

 of the first two dorsal plates there are such grains. The under side of the 

 disk more sparingly beset with grains. Genital scale not distinct. 



Six rough arm-spines, with two rows of thorns ; they are accordingly 

 smooth as seen from within or without, rough seen from above or below. 

 The upper one, or that next to it, is the longest, as long as 2-3 arm-joints; 

 the lower one the shortest, scarcely as long as a joint. They stand almost 

 at a right angle to the arm, and they are far from making a complete series 

 over the dorsal side of the first free arm-joints. There is one large oval 

 thick tentacle scale. 



Color in alcohol : gray. 



Stations 3424^ 676 f. (13 specimens); and 3426, 146 f. (1 specimen). 



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