MUSEUM OF COMPARATIVE ZOOLOGY. 25 



Amphiura glabra sp. nov. 



Plate XI. Figrs. 308-310. 



Special Marks. — Disk below naked. Moiitli-shields wider than long. Five 

 stout, tapering arm-spines. One tentacle-scale. * 



' Description of an Individual (Station 214). — Diameter of disk 5 mm. Length 

 of arm about 20 mm. Width of arm close to disk, without spines, .8 mm. One 

 ' stout mouth-papilla in shape of an elongated cone on each side, and a pair, 

 thick and rounded, at the apex of the mouth-angle. Mouth-shields broader 

 than long, rudely triangular, with outer edges much rounded, and a small peak 

 within. Side mouth-shields small, longer than broad, wide without, tapering 

 inward, where they do not quite meet. Under arm-plates narrow, longer than 

 broad, squarish, with re-entering curves on the lateral sides, outer corners 

 rounded, and often an obtuse truncated angle within. Side arm-plates of mod- 

 erate size, and slightly flaring, meeting neither above nor below. Upper arm- 

 plates somewhat arched, rudely triangular, with outer edge rounded, and a blunt 

 angle within ; further out on the arm they become transverse oval. Disk flat 

 and lobed, covered above with thin, rather indistinct scales ; those in the 

 centre coarser and more rounded ; those in the interbrachial spaces narrower 

 and more closely overlapping. Radial shields short pear-seed shape, longer 

 than broad, separated their entire length by a narrow wedge-row of small 

 scales. Interbrachial spaces on the under surface naked. Five rather stout, 

 tapering arm-spines, somewhat longer than the arm-joints, placed close to- 

 gether on the side arm-plate. One rather large round tentacle-scale near the 

 inner angle of the under arm-plate. Color in alcohol, nearly white. 



Station 214, 500 fathoms, 1 specimen. 



This species is allied to A angularis, but has a finer build ; side arm-plates 

 less prominent ; side mouth-shields smaller, and radial shields shorter and 

 wider. 



Amphiura angularis, sp. nov. 



Plate XI. Figs. 311-313. 



Special Maries. — Disk below naked, or with a few rudimentary scales. One 

 well-marked tentacle-scale. Four or five tapering cylindrical arm-spines. 

 Mouth-shields rounded. 



Description of an Individual (Station 150). — Diameter of disk 9 mm. Length 

 of arm 45 mm. Width of arm, without spines, close to disk, 1.2 mm. One 

 long, tapering, pointed mouth-papilla on each side, and a pair, short, blunt, and 

 much rounded, at the apex of the mouth-angle. The tentacle-scale of the first 

 pair is large and spiniform. Mouth-shields rather large, nearly circular, with a 

 small peak within. Side mouth-shields large, three-sided, broad without, and 

 curving downward about the mouth-shield, narrow and separated within. 

 First under .arm-plate very small and squarish ; those beyond are nearly square 



