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174 



THE OPIIIURIDiE 



without; inner angle obtuse, inner sides straight, corners rounded; the 

 outer lobe has a little impression. Side month shields straight, almost 

 equally broad in their whole length, meeting within. 



First ventral plate rather large, outer edge strongly curved, the sides 

 deeply concave. Those beyond arc broadly in contact until about the 

 8th to 10th joint, farther out they have an obtuse angle within ; outer edge 

 curved, inner and outer laterals re-enteringly curved, outer corners rather 

 sharp. They are almost equally broad and long. Side arm-plates with 

 spine-ridge rather prominent. Dorsal plates all separated, rhomboidal or 

 triangular (according to the more or less strong curve of the outer edge), 

 about as broad as long. Arms not distinctly knotted. 



Disk covered with stout rough stumps, c. 0.4 mm. long (Plate XVI. Fig. 

 12), which are not so close set as to hide the scahng of the disk completely. 

 The radial shields are uncovered, small, triangular, separated by one or 

 more rather large scales. Ventral side of the disk finely scaled, almost 

 wholly without stumps, only along the margin a few are seen. Genital 

 scale can be seen at the outer end of the slit. , 



Six arm-spines, on the inner joints seven, farther out only five ; they are 

 feebly thorny at the end. The upper ones not much longer than the lower, 

 as long as 1^-2 arm-joints ; farther out they are only a little shorter, w^hich 

 gives the arm a rather coarse aspect. On the first free joint they form an 

 almost continual series over the dorsal side of the arm. The two-three 

 first pairs of pores have two tentacle scales, those beyond only one, large, 



oval. 



Color in alcohol : pale gray-white. 



Four specimens from Station 3380, 899 £ 



1 



52. Ophiacantha hirta n. sp 



Plate XVIII. Figs. 5-8. 



Diameter of disk, 11 mm. 5 width of arm close to disk, without spines, 

 2 mm. ; length of arms unknown, but evidently the same as usual in 

 Ophiacantha, Six conical mouth papilla) on each side of the somewhat. 

 elongated mouth angle; that on the apex not distinctly larger than the rest. 

 Mouth shield with an obtuse angle within, a broad lobe without, inner sides 

 concave, side corners rounded ; more broad than long. Side mouth shields 

 more broad within than without ; inner ends rounded, meeting broadly. 



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