MUSEUM OF COMPARATIVE ZOOLOGY. 225 



Amphiura tumida sp. nov. 



Plate II. Fis8. »8 - 30. 



Special Marks. — Ten mouth-papillae to each- angle, whereof eight are small 

 and bead-like, and two, under the teeth, are very kirge and swollen. 



Description of an Individual (Station 47). — Diameter of disk 9.5 mm. 

 Width of arm without spines 1 mm. Arms very long, but broken, so that 

 measurement -was impossible. Four short bead-like mouth-papilla) on either 

 side of the mouth-angle, and two large and much swollen at the ape.\ ; those 

 on the sides form a re-entering curve. Mouth-shield large, angular egg-shape, 

 with the rounded edge outward. Side mouth-shields small, narrow, and just 

 meeting within, with outer end club-shaped. Under arm-plates large, pen- 

 tagonal, with inner angle more or less truncated or rounded, lateral sides re- 

 enteringly curved, and outer edge curved ; at some distance out on the arm 

 the inner angle is sharp. Side arm-plates flat, and projecting at their outer 

 edge, meeting neither above nor below. Upper arm-plates broad and rounded, 

 much wider without than within, and showing the underlying ridge of the 

 arm-bone. Disk 'puffed, and lobed in the interbrachial spaces. Upper surface 

 covered with very thin, flat, overlapping, semicircular scales, about seven in 

 the length of a mm., where they are coarsest. Radial shields long, curved, and 

 veiy narrow, a little wider without, tapering inward, widely separated, except 

 at their outer points, by fine scaling ; just outside their tips is a minute crotchet. 

 Interbrachial spaces on the under surface also covered by fine scales. Genital 

 scales long, narrow, and hidden, except at their outer end. Three or four pointed 

 arm-spines, about as long as a joint, and placed close together. Two small, flat, 

 rounded tentacle-scales, one on the brachial side of the tentacle-pore, the other 

 on the side arm-plate. Color in alcohol, pale yellow, spotted with reddish. 



Station 47, 321 fathoms, 2 specimens. 



Amphiura cuneata sp. nov. 



Plate II. Figs. 34 - 36. 



Special Marks. — Ten similar bead-like mouth-papillse to each angle. Three 

 slender arm-.spines. 



Description of an Individual (Station 43). — Diameter of disk 3 mm. Width 

 of arm without spines .7 mm. Ten minute bead-like mouth-papilla) to each 

 mouth-angle, whereof two are at the apex. Mouth-shields small, longer than 

 wide, with a sharp angle within, lateral sides curved, and outer edge rounded. 

 Side mouth-shields long, wedge-shaped, rounded, and slightly swollen without, 

 tapering inward, where they just meet. Under arm-plates pentagonal, with an 

 angle inward, and lateral sides a little re-enteringly curved. Side arm-plates 

 small and narrow, meeting below beyond the disk, but separated above by the 

 somewhat arched upper arm-plates, which are rounded, with a curve without 

 and within. Disk rather flat, covered above and below with small, thin, over- 

 lapping scales. Radial shields long and narrow, with the outer ends touching 

 and swollen, separated slightly within by a wedge of minute scales. Three 

 slender arm-spines, bluntly pointed, about as long as an arm-joint, evenly 



