6o NATURAL HISTORY BULLETIN. 



these is much the larger, acute, lanceolate, concave, erect; 

 farther out they rapidly decrease and become narrow, blunt 

 or clavate and thorny at the tip. 



The arm-spines are translucent, long, slender, terete, 

 tapered, mostly acute, and roughly serrate or thorny; the up- 

 per ones are considerably longer and more slender than the 

 lower ones. The rows are dorsally approximate. There 

 are eight or nine spines in the larger rows. 



The upper arm-plates, except the basal, are broadly rhom- 

 boidal; the outer margins form an obtusely rounded angle; 

 side angles very acute; inner angle obtuse, but often with an 

 acute tip. They are separated by the side plates. Basal 

 plate short, transversely elliptical. 



Diameter of disk of the type specimen, n mm; breadth of 

 arm at base, without spines, 3 mm; length of longest spines. 

 4-6 mm. 



Station 12, off Havana, 200 fathoms, one example; station 

 2, off Havana, no fathoms, one example. 



Ophiocamax austera Verrill, sp. nov. 



Plate VI; Figures i, la. Plate VII; Figure 2. 



Rays five. Disk deeply five-lobed, covered with small 

 polygonal scales and large naked radial shields. The small 

 scales bear each a single, small, rough or thorny, tapered 

 spine, some of which are elongated and others short-conical. 



The radial shields are very large, acute-triangular, in con- 

 tact throughout the length of the straight inner edges, but 

 with a row of small spinules along the suture. Their inner 

 ends are covered by small overlapping scales; their outer 

 ends are separated by a small group of scales bearing spin- 

 ules. 



The under side of the disk is covered with small angular 

 scales, bearing a few small conical spinules. 



Oral shields thick, warty, small, and irregularly trilobed; 

 the body or proximal part is transversely elliptical with an 



