22 BULLETIN OF THE 



nearly straight, and lateral sides a little re-enteringly curved. Side arm-plates 

 somewhat flaring, with a well-marked spine-ridge, meeting narrowly above and 

 barely separated below. Upper arm-plates twice as broad as long, with a clean 

 curve within and the outer side nearly straight, but having usually a feeble 

 lobe in the centre. Disk rather thick, covered with fine, curved, rather thin, 

 overlapping scales, which are largest in the centre, where may be distinguished 

 an ill-marked rosette of primary plates ; thctse near the margin are much finer 

 (about 8 in the length of 1 mm.) : on the lower surface they become thinner and 

 near the mouth-shield are hard to distinguish. Kadial shields short and wide, 

 curved on the interbrachial side, straight on the brachial ; barely touching 

 without, separated within by a narrow wedge of four or five scales ; length to 

 breadth, 1.1 : .6. Three short, cylindrical, gently tapering, blunt, equal arm- 

 spines about .5 mm. long. One minute, rounded tentacle-scale. Color in alco- 

 hol, pale gray. 



Station 235, 565 fathoms, 3 specimens. 



Amphiura constricta sp. nov. 



Plate XI. Figs. 295 - 298. 



Si^ecial Marks. — Disk finely scaled on both sides. One tentacle-scale. Ra- 

 dial shield narrow, about thrice as long as wide. Six short, stout arm-spines. 

 Upper arm-plates narrow, 



Descri-piion of an Individual (Station, Port Jackson). — Diameter of disk, 5 mm. 

 Length of arm, 30 mm. Width of arm near disk, 1 mm. One minute, rounded 

 papilla at base of mouth-angle, on either side, and a pair, much larger, at the 

 apex. Above may be seen the small scales of first mouth-tentacles, which resem- 

 ble the outer mouth-papillse. Mouth-shields wider than long, of a three-sided 

 or wide heart-shape with rounded angles. Side mouth-shields long and narrow, 

 especially within, where they do not meet. First under arm-plate small and 

 very narrow ; those beyond are small and narrow, a little longer than wide, and 

 four-sided with rounded corners ; they cover only a small portion of the un- 

 der side of the arm. Side arm-plates small and not projecting. Upper arm- 

 plates small and covering only a portion of the upper side ; pretty regular 

 transverse oval, about twice as broad as long. Disk thick and somewhat 

 puffed, covered with regular, small, rounded, overlapping scales, which are 

 somewhat larger near the centre, where small round primary plates, widely 

 separated by smaller scales, may be distinguished ; below and near margin of 

 disk, the scaling is finer and more delicate, about 10 in the length of 1 mm. 

 Radial shields long, narrow, and slightly curved, acute within, separated their 

 whole length by a wedge of many irregular scales of several sizes ; length to 

 breadth, 1 : .3. Six small, short, stout, blunt, peg-like, equal arm-spines about 

 .3 mm. long, of which one or two are microscopically rough at their ends. The 

 spines at tip of arm are similar, but proportionately longer. One rather large 

 oval tentacle-scale. 



Station, Port Jackson, Australia, 2 to 10 fathoms, 1 specimen. 



