46 NATURAL HISTORY BULLETIN. 



Taken by the "Blake" at many localities, in 56 to 262 

 fathoms. 



Ophialc^ea Verrill, subgen. nov. (See p. 42.) 



Ophiacantha (Ophialc^ea) nuttingii VcrrilU sp. nov. 



Plate I; Figure 2. Plate VIII; Figures i — la. 



Five arms. Disk five-lobed, with strong interradial notch- 

 es, covered, except on a portion of the radial shields, with 

 small, exposed, imbricated scales, which usually bear a single 

 short, conical, acute, nearly smooth spinule. The radial 

 shields are rather small, separate, partly naked; the exposed 

 part is narrow and elongated, somewhat crescent-shaped. 

 The proximal sides are incurved and somewhat divergent, 

 separated by several rows of small scales bearing conical, 

 acute spinules. Scales bearing acute conical spinules, similar 

 to those of the upper surface of the disk, but longer, cover 

 the bases of the arms and the margin of the disk, toward the 

 oral shields, the scales become much smaller and are usually 

 without spinules. 



The oral shields are large, broad, obovate, rather longer 

 than broad, with rounded ends. The madreporic shield is 

 larger and has a more prominent distal end. The buccal 

 plates project but little beyond the oral shields. The adoral 

 shields are very narrow, wedge-shaped, inconspicuous, and 

 do not meet proximally. 



The oral papillae are about rive on each edge of the jaw, 

 besides a terminal tooth papilla, the outer one is broad, ovate, 

 obtuse, flat, and wider than the others, which are conical, 

 pointed, and decrease proximally; tooth-papillee small, spini- 

 form, arising from the dental plate. 



Under arm-plates are mostly broad, widest proximallv, 

 trapezoidal, with the distal end evenly curved and the inner 

 end truncated, and broadly in contact. They are broader 

 than long; those near to the base of the arms are narrower; 



