28 BULLETIN OF THE 



and a truncated angle within. Side arm-plates short, not much projecting, meet- 

 ing above beyond the first upper arm-plate, and below beyond the seventh or 

 eighth. Upper arm-plates slightly swollen, very short and wide, of a trans- ^ 

 verse oval shape, and with a small longitudinal ridge. Disk flat and tolerably 

 thick, covered with thin, small, flat, overlapping scales, with one somewhat 

 larger rounded primary in the centre ; about 4 scales in the length of 1 nmi. 

 Radial shields long and broad, bluntly pointed within, nearly or quite sepa- 

 rated their entire length by a narrow wedge of scales. On the interbrachial 

 spaces on the under surface the scaling is much finer than that above, there 

 being about 15 in the length of 1 mm. Three tapering, rather sharp arm- 

 spines, the upper one being shorter than the other two, and the middle one 

 much the stoutest, and swollen. One small longer than broad tentacle-scale on 

 the brachial side of the tentacle-pore ; a little way out on the arm there 

 usually is no tentacle-scale. Color in alcohol, pale straw. 

 Station 325, 2,650 fathoms, 5 specimens. 



Amphiura cernua sp. nov. 



Plate XII. Figs. 323-335. 



Special Marks. — Four mouth-papillae on each side. One tentacle-scale. 

 Three arm-spines, the middle one swelled. Disk-scales coarse ; all primary 

 plates conspicuous. First under arm-plate wide and large. 



Description of an Individual (Station 241). — Diameter of disk 5.7 mm. 

 Length of arm about 24 mm. Width close to disk, without spines .7 mm. 

 Four mouth-papillae on each side, of which three are short and blunt (the inner 

 one being more pointed), and two at the apex of the mouth-angle are larger and 

 more swollen. Mouth-shields small, flat, triangular, with a blunt angle inward 

 and outer edge curved. Side mouth-shields broad without, and tapering inward, 

 where they just meet. Under arm-plates large, with a long angle within and 

 slight re-entering curves on the lateral sides. Side arm-plates slightly swollen, 

 meeting below some distance out on the arm, and above beyond the first upper 

 arm-plate. Upper arm-plates transverse oval, slightly swollen, with outer and 

 inner edges much curved. Disk flat and slightly angular, covered with thin, 

 semicircular, overlapping scales, the six primary plates being much the largest ; 

 the scaling in the interbrachial spaces is somewhat coarser than on the rest of 

 the disk. Eadial shields very large and broad, somewhat longer than wide, of 

 a blunt pear-seed shape ; joined without, separated within by a wedge of two 

 small scales. On the under surface the interbrachial space is covered with 

 very minute scaling. One large tentacle-scale longer than broad. Three 

 short arm-spines, the upper one longest and slender, while the middle one 

 is strongly swollen at its base. Color in alcohol, straw. 



Station 241, 2,300 fathoms, 1 specimen. 



