26 BULLETIN OF THE 



and rather narrow, with outer corners rounded, and slight re-entering curves 

 on the hiteral sides. Side ai-m-phates wide, prominent, and much swollen along 

 the spine-crest ; separated below, nearly or quite meeting above. Upper arm- 

 plates transverse oval, much wider than long, with well-rounded lateral ends. 

 Disk flat and angular, covered above with coarse, rounded, overlapping scales, 

 the five primaries being but little larger than the other scales ; the scaling on 

 the interbrachial spaces is finer than in the central portion. Radial shields 

 much longer than broad, tapering towards each extremity, with the inner point 

 acute, separated their entire length by two or three rows of irregular scales ; 

 length to breadth 2 : ,7. The scales of the margin continue round the outer 

 end of the radial shields. Interbrachial space below only al)out one third 

 covered with minute scaling; the rest of the space is naked. Four stout, 

 blunt, tapering, cylindrical arm-spines, evenly spaced on the side arm-plate. 

 One stout, round tentacle-scale on the inner side of the tentacle -pore. Color in 

 alcohol, disk gray, arms straw. 



Station 150, 150 fathoms, 12-|- specimens. 



Amphiura dilatata sp. nov. 



Plate XI. Figs. 314-316. 



Special Marks. — Disk naked below. Radial shields narrow pear-seed shape. 

 Four or five small, widely spaced arm-spines. No tentacle -scales. 



Description of an Individual (Station 141 ). — Diameter of disk 5 mm. Length 

 of arm 23 mm. Width of same without spines, close to the disk, .7 mm. At 

 the base of the mouth-angle, on each side, is a long, very slender mouth-papilla, 

 and a pair, blunt and rounded, at the apex. Mouth-shield small, short diamond- 

 shape, with much rounded angles. Side mouth-shields small and curved, 

 narrow within, where they nearly or quite meet ; outer end wide club-shaped. 

 Under arm-plates narrow, longer than broad, squarish, with re-entering curves 

 on the lateral sides, and the outer edge nearly straight. Side arm-plates very 

 small, not prominent, nearly or quite meeting above, separated below. Upper 

 arm-plates transverse oval, with the inner curve stronger than the outer, and 

 the lateral corners pointed ; there is a slight longitudinal ridge. Disk rather 

 thick and slightly puffed ; primary plates widely separated and scarcely to be 

 distinguished from the general scaling, which is fine, regular, and overlapping, 

 having about 10 scales in the length of 1 mm.; those of the interbrachial spaces 

 are smallest and most closely overlapping. Radial shields small, and slightly 

 swollen, narrow pear-seed shaped, separated their entire length by a narrow 

 wedge-row of scales ; a pair of short, stout scales at their outer ends. Under 

 surface of disk naked. Five short, tapering, blunt arm-spines, evenly spaced 

 on the side arm-plate, and standing at right angles to the arm ; the middle 

 spine is stoutest. Large tentacle-pores, but no tentacle-scales. Color in alco- 

 hol, disk gray, arms straw. 



Station 141, 98 fathoms, 12-}- specimens. 



