20 BULLETIN OF THE 



beyond squarish, about as long as broad, with outer side nearly straight, lateral 

 sides a little re-enteringly curved, and usually a very short truncated angle 

 within. Side arm-plates small, and not strongly projecting, meeting neither 

 above nor below. Upper arm-plates thin, of a pretty regular transverse oval 

 shape, with lateral corners well rounded Disk rather thick, and slightly lobed, 

 covered above and below with small, rather thin, overlapping scales, among 

 which the primaries are scarcely to be distinguished ; those near the margin 

 and underneath are finest, being 9 or 10 in 1 mm. long. Radial shields long, 

 narrow and pointed within ; length to breadth 2 : .7 ; they are separated their 

 whole length by a narrow wedge composed of scales longer than those of the 

 neighboring disk. Four moderately stout, cylindrical, tapering arm-spines, of 

 equal lengths, and somewhat longer than the arm-joints. Two minute rounded 

 tentacle-scales, one on the side arm-plate, the other on the under arm-plate. 

 Color in alcohol, very pale brown. 

 • The young of this species has sometimes only one tentacle-scale. 

 Station 232, 345 fathoms, 9 specimens. Station 174 (var. ?), 210-610 fath- 

 oms, 1 specimen. 



Amphiura incana sp. nov. 



Plate XI. Figs. 385-887. 



Special Marks. — Disk scaled on both sides. Two tentacle-scales. Radial 

 shields narrow, about three times as long as wide, nearly or quite separated. 

 Lower scaling coarse. Seven or eight short, blunt, crowded, very thick arm- 

 spines. 



Description of an Individual (Station, Simon's Bay, Cape of Good Hope). — 

 Diameter of disk 7 mm. Arms about 70 mm. long, and slender ; close to disk 

 their width without spines is 1.3 mm. One short wide curved papilla each side 

 of mouth-angle, and a pair, stout and bluntly pointed, at the apex of the mouth- 

 angle above ; the tentacle-scales of the first pair are conspicuous. Mouth-shields 

 small, of a wide diamond-shape, with outer angle truncated. Side mouth-shields 

 much longer than wide, tapering slightly within, where they nearly or quite meet ; 

 outer ends much rounded. Under arm-plates nearly square, with rounded cor- 

 ners, and outer edge a little re-enteringly curved. Side arm-plates rather thick 

 but not prominent, meeting neither above nor below. Upper arm-plates small, 

 narrow, squarish with rounded corners ; narrow within, broader without. Disk 

 round, not very thick, covered with thin, very small overlapping scales : on 

 the upper surface there are 5 or 6 in the length of 1 mm. Radial shields small, 

 of a long pear-seed shape, with outer edge rounded, separated their entire length 

 by a wedge of three rows of crowded, closely overlapping scales. Just outside 

 the radial shields there are numerous fine scales. On the under surface of disk 

 the scaling is much finer, there being about 12 in the length of a mm. Eight 

 very short, stout, broad, nearly equal flattened arm-spines ; the two upper spines 

 are somewhat broader than the others. Two minute rounded tentacle-scales on 

 the side arm-plate. Color in alcohol, pale straw. 



Station, Simon's Bay, Cape of Good Hope, 10-20 fathoms, 12-|- specimens. 



