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THE OPHIUEIDiE. 



179 



56. Ophiomitra partita n. sp 



riate XIX. Figs. 5-8. 



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Diameter of disk^ 4.5 mm.; width of arm close to disk^ without spines, 



-r- 



1 mm. ' leno-tli of arms unknown, but apparently about five times the diame- 

 ter of the disk. Three conical mouth papillae on each side of the rather elon- 

 gated mouth angle ; that on the apex a little larger than the rest. Mouth 

 shield broader than long, with an obtuse angle within and a little rounded 

 peak without ; corners rounded, inner and outer sides concave. Side mouth 

 shields a little curved, almost equally broad in their whole length; a httle 

 rounded within, where they scarcely meet. 



First ventral plate rather small, six-sided, or with outer edge curved. 

 Those beyond all widely separated 3 the second broader than long, then they 

 become gradually narrower, and are thus at last longer than broad. They 

 have a very obtuse angle within, outer edge curved, with an incisure in the 

 median line, scarcely seen on the inner ones, farther out very conspicuous. 

 Inner laterals of second ventral plate concave, from the third slightly 

 convex; outer laterals concave, outer corners rather sharp. Side arm-plates 

 with spine-ridge not very prominent. Dorsal plates triangular, with outer 

 edge carved, equally broad and long, widely separated. 



Disk covered with delicate, overlapping scales, beset w^ith spreading short 

 (c. 0.1 mm.) stout spines, which end in three bifurcating thorns (Fig. 8, a, h). 

 The radial shields uncovered, not half as long as the radius of the disk; 

 they are oval, with outer edge almost straight, separated by a single row of 

 large scales; some few spines along their outer edge. The ventral side 

 covered with similar scales, but without spines. Genital scale not distinct. 



Five rough, thorny arm-spines, which do not form a continuous series 

 over the dorsal side of the first free joint; the uppermost but one on the 

 second joint is the longest, a little longer than two arm-joints; farther out 

 it becomes shorter. Downwards they gradually diminish in length, the 

 lower one being not so long as a joint. One rather large, broad, pointed 



tentacle scale. 



Color in alcohol : white. 



One specimen from Station 3424, 676 f. 



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