58 BULLETIN OF THE 



are sharp and peg-like , the pair at apex of angle are thickened and conical. 

 Five flat teeth, a little longer than wide, with a curved cutting edge. Mouth- 

 shields long heart-shaped, or broad spear-head shaped ; length to breadth 1.5 : 

 1.2. Side mouth-shields large and three-sided, wide without, tapering inward, 

 where they nearly or quite meet. First under arm-plate small and wider than 

 long ; plates beyond, wide pentagonal, with outer side gently curved, laterals 

 re-enteringly curved, and inner angle so obtuse and rounded as to be almost a 

 gentle curve. Side arm-plates barely meeting below, separated above, rising in 

 a thick abrupt spine-ridge. Upper arm-plates small, thick, and fan-shaped, 

 with the angle inward. Disk thick and puffed, covered above by an even 

 granulation, 9 or 10 grains in the length of 1 mm. On removing these, there 

 is disclosed a smooth coat of very thin scales, about 5 in the length of 1 mm., 

 which cover the radial shields, except their outer ends ; interbrachial spaces 

 below without grains, and covered with scales still finer than those above. 

 Seven slender, much flattened arm-spines, slightly rough on the edges; the 

 uppermost one extremely long, sometimes equal to five arm-joints, diminishing 

 to the lowest, which is longer than one joint. Two large, oblong, slightly pointed 

 tentacle-scales. Color in alcohol, pale brown above, much lighter below. 

 Station 192, 129 fathoms, 1 specimen. 



Ophiacantha Normani sp. nov. 



Plate XV. Figs. 414-416. 



Special Marks. — Disk distinctly scaled and sparsely granulated, and with 

 small, separated radial shields. A single row of grains along the outer edge 

 of the basal upper arm-plates. Four smooth, slender spines, the upper ones 

 longest. 



Description of an Individual (Station 232 ). — Diameter of disk 12.5 mm. 

 Length of arm about 40 mm. Width of arm next disk 2.5 mm. Seven widely 

 spaced, cylindrical, tapering, peg-like mouth-papillae, three on each side, and 

 one at apex of mouth-angle. Mouth-shields a little broader than long, thick and 

 square, with a little peak without and within ; length to breadth 1 : 2. Side 

 mouth-shields long and narrow, their outer end wedged between the first and 

 second under arm-plates ; not quite meeting within. First under arm-plate well 

 marked, of a rounded triangular shape, with the point outward ; third plate, 

 and those just beyond it, broader than long, bounded without by a curve, on the 

 sides by re-entering curves, and within by an angle ; length to breadth (4th 

 plate) 1.3 : 1.7. Side arm-plates with a swollen spine-ridge, meeting below, 

 but separated above, stout, and, like the under plates, microscopically tuber- 

 culous. Upper arm-plates about as broad as long, short wedge-shaped, with 

 outer side curved and a blunt angle within ; the first three or four have, 

 along their outer margin, a single row of rounded grains. Disk flat, somewhat 

 angular, covered with well marked, pretty equal, overlapping scales, whose sur- 

 face is sparsely set with rounded grains, similar to those of the upper arm-plates ; 

 interbrachial spaces below similarly covered, except that the scales are smaller 



