MUSEUM OF COMPARATIVE ZOOLOGY. 19 



Amphiura maxima sp. nov. 



Plate XI. Figs. 278-281. 



Special Marks. — Disk covered on both sides with swollen, lumpy, irregular 

 scales : ten stout, sharp arni.-spines. Outer mouth-papillae wide and scale-like. 

 Two very large tentacle-scales, one overlapping the other. 



Description of an Individual (Station 188), — Diameter of disk 15 mm. 

 Length of arm about 135 mm. Width of arm, close to disk, without spines, 2.5 

 mm. One very large square mouth-papilla on each side of the angle, and a 

 pair much smaller and more rounded at the apex ; besides these, there may be 

 distinguished a minute papilla outside the great flat one. Mouth-shields large, 

 and much curved within, and prolonged by a rounded lobe without. Side 

 mouth-shields very small, pear-seed shape, with the smaller end inward ; they 

 occupy the inner lateral sides of the mouth-shield, and are widely separated. 

 Under arm-plates four-sided, broader than long, outer and inner edge slightly 

 curved, and with feeble re-entering curves on the lateral sides. Side arm-plates 

 short and high, scarcely prominent, meeting neither above nor below. Upper 

 arm-plates small, little swollen, nearly round ; but some distance out on the arm 

 they are broader than long. Disk round, flat, and rather thick, having a notch 

 over each arm ; surface covered above and below with rather large, rounded, 

 swollen, loosely overlapping scales, those in the interbrachial spaces being 

 slightly larger. Radial shields pear-seed shape, little swollen, with a peak in- 

 ward, separated their entire length by a row of three elongated scales, the inner 

 one being surrounded by several much smaller. On the outer edge of the radial 

 shields there is a row of small scales continuous with those on the margin of 

 the disk. There are ten stout, pointed arm-spines, the two lowest being about 

 twice as long as the otliers, much sharper, and usually curved. Two very large, 

 flat tentacle-scales with curved edges, one on the inner margin of the tentacle- 

 pore, which overlaps the one on the edge of the under arm-plate. Color in 

 alcohol, straw. 



Station 188, 28 fathoms, 2 specimens. 



Amphiura bellis sp. nov. 



Plate XI. Figs. 283 - 284. 



Special Marks. — Disk covered above and below with delicate scales ; two 

 tentacle-scales. Radial shields narrow, about three times as long as wide ; four 

 straight tapering arm-spines ; upper arm-plates thin. 



Description of an Individual (Station 232). — Diameter of disk 7 mm. Arm 

 long, slender, and tapering gradually ; its width next the disk is 1 mm. One 

 stout, short, blunt papilla on either side of the base of mouth-angle, and a pair, 

 stout and bluntly pointed, at its apex. The tentacle-scales of the first pair are 

 spiniform and rather conspicuous. Mouth-shields small and rounded, with 

 sometimes a rounded angle within and a slight lobe without. Side mouth- 

 shields three-sided, quite broad without, tapering within, where they do not 

 meet. First under arm -plate six-sided and rather larger than usual ; those 



