232 BULLETIN OF THE 



times four, stout, rounded, tapering arm-spines, not quite as long as a joint. 

 One round, thick tentacle-scale. Color in alcohol, nearly white. 



Station 258, near Grenada, 159 fathoms, 1 specimen. 



This species is very near P. heros, dredged in 900 fathoms by the " Chal- 

 lenger," near New Guinea, but differs in its longer and differently placed arm- 

 spines, and in the indentations between the basal under arm-plates. 



Pectinura angulata sp. nov. 



Plate III. Figs. 7-9. 



Special Maries. — Disk with thin scales covered by a fine granulation. Nine 

 arm-spines, of which the lowest is longest and broad and flat. Pores only be- 

 tween the first three under arm-plates. 



Description of an Individual (Station 134). — Diameter of disk 27 mm. 

 Width of arm close to disk 5.5 mm. About twenty niouth-papilhc to each 

 angle, of which the two or three outer ones are much the widest and are 

 squarish, while those within are spiniform. The lowest of the five broad, flat 

 teeth is split in two, and there are sometimes one or two additional papilla; at 

 the apex of the mouth-angle. Under arm-plates within the disk wider than 

 long, bounded without by a curve, within by a wide much-truncated angle, 

 and on the sides by re-entering curves. Further out they are as long as 

 broad and nearly octagonal. They are stout but not swollen, and there are 

 pairs of pores between the first three. Side arm-plates with a gently curved 

 outer edge, and occupying nearly the whole height of the arm. Upper arm- 

 plates smooth, nearly flat, regular, with straight outer and inner sides, and the 

 outer corners rounded. They occupy nearly the whole upper surface. Length to 

 breadth, 1.5 : 4. Mouth-shields short heart-shape, with a rounded angle within. 

 Length to breadth, 4 : 5.5. Supplementary shields small, and swollen ; length 

 to breadth, 1 : 1.3. Side mouth-shields reduced to a little plate, at the outer 

 corner of the mouth-shield. Disk angular, and covered by a close, fine gian- 

 ulation, which is easily rubbed off, as is shown in the figure. There are about 

 seven grains in the length of 1 mm. Radial shields naked, of a narrow oval 

 shape and pointed within ; length to breadth, 4 : 2. The scale-coat of the disk 

 is of thin delicate scales about 1 nmi. in length. Arm-spines nine, the eight 

 ujipermost slender, pointed, and flattened, and about three fourths the length of 

 a joint. The lowest one is much wider, blunt, and longer than a joint. Two 

 tentacle-scales of a short spatula-shape : the upper one covering the l)ase of the 

 lowest arm-spine. On the first tentacle-pore there are usually two supplemen- 

 tary scales placed just outside the pore. Color in alcohol, nearly white. 



Station 134, near Santa Cruz, 248 fathoms, 1 specimen. Station 232, St. 

 Vincent, 88 fathoms. 



This species is nearest P. rigida, from whi( li it is di-stinguished by a shorter 

 under arm-spine, larger radial shields, coarser disk-scales, and pores between the 

 under arm-plates extending only to three joints. 



