18 ' AMPHIURA REPENS. 



nals at Stockholm, except, 1st, the outer mouth-papilla can scarcely be 

 called " spiniform " ; 2d, the peculiar microscopic beak at the end of the 

 third and fourth arm-spines is not mentioned by him, but might easily have 

 escaped notice. 



Hassler Expedition; one small specimen, Barbadoes, 100 fathoms. Also 

 several larger specimens (disk, e.S"""- ; arm, 45""" ), by Dr. Palmer, from Bay 

 of Biscayne, Florida. Its general appearance is that of Ophiopdla Riisei. 



Amphmra repens sp. nov. 



PI. III. f. S8-40. 



Special Marks. — Disk naked below, finely scaled above, and without con- 

 spicuous primary plates. Three blunt arm-spines. One tentacle-scale. 



Description of an Individual. — Diameter of disk, 4.5""-. Width of arm, with- 

 out spines, .7°"°'. Arms long. Mouth-papilloe small, rounded, flat, scale-like ; 

 three on each side of the narrow, prominent mouth-frames ; the innermost 

 one touching the inner part of the side mouth-shield. Mouth-shields rounded 

 heart-shape, having a slight peak without ; length to breadth, .3 : .3. Side 

 mouth-shields triangular, with re-entering sides ; they do not meet within. 

 Under arm-plates pentagonal, with somewhat rounded corners and an angle 

 inward; length to breadth, .3 : .3. Side arm-plates weak, narrow, not promi- 

 nent; nearly or quite meeting above and below. Upper arm-plates wider 

 than long, with a strong curve within, and a gentle one without ; length to 

 breadth, .3 : .6. Disk flat and delicate, covered above with a fine, thin 

 scaling ; about fourteen scales in the length of a mm., among which the pri- 

 mary plates are not conspicuous ; below, the interbrachial space, except 

 next the margin, is naked. Eadial shields long and narrow, joined for their 

 entire length, except their sharp inner points, which are separated by a 

 single scale ; length to breadth .8 : .2. At their outer ends are two little 

 radial scales, making a small notch in the margin of the disk. Arm-spines 

 three, short, rounded, blunt, nearly of equal lengths, the upper one stoutest ; 

 about as long as an under arm-plate. Tentacle-scale one, sitting on the 

 side arm-plate. 



Color yellowish in alcohol, with a faint stripe along the upper side of the 

 arm. 



Dr. William Stimpson ; west coast of Florida ; 14 fathoms. 



The back of the disk and arms is like A. lawis, which is from the Philip- 



