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, 6.")"" 1 ; arm. 4">""" ). by Dr. Palmer, from Bay 

 of Biscayne, Florida. Its general appearance is that of OphiopsUa Hikei. 



Amphiura repens Bp. nov. 

 PI 111. f. 38 40. 



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

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



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

 out spines, .7 mm . Arms long. Mouth-papillae small, rounded, tlat. 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 tlat and delicate, covered above with a line, thin 

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

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

 next the margin, is naked. Radial Bhields 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. - li< nt . rounded, blunt, nearly of equal lengths, the upper une 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; I I fathoms. 



The back of the disk and arms is I i k < > .1. faRM, which is from the Philip- 



