MUSEUM OF COMPARATIVE ZOOLOGY. 225 
Amphiura tumida sp. nov. 
Plate II. Figs. 28 - 30, 
Special Marks, — Ten mouth-papille to each angle, whereof eight are small 
and bead-like, and two, under the teeth, are very large 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-papille on either 
side of the mouth-angle, and two large and much swollen at the apex ; 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 júst 
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 
very 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 XY. Figs. 34 - 36. 
Special Marks. —Ten similar bead-like mouth-papille 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-papille 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 
