116 



AMPlllURA GPvAClLLIMA. 



Amphmra fiUformis Forbes. 



Asterias JiViforinis O. F. Muller. Zool. Dan. Prodr. 1776. 

 Ophiura fiUformis Lamk. Hist. Anim. sans Verteb., II. p. 546. 1816. 

 Ampldnra filifonnis Forbes. Linn. Trans., XIX. p. 151. 1843. 

 Ophiok'pis fiUformis Mull. & Trosch. Syst. Asteriden, p. 94. 1842. 



LIST OF SPECIMENS. 



Catiilosue 

 Number. 



Oripnal 

 Number. 



Number 

 of Spec. 



Locality. 



When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



3Iuseum of Comparative Zoology. 



235 



37 



Oresund. 



University Museum, 

 Copenhagen. 



Alcoholic. 



Amphiura gracillima Lutken. 



Opliiolepis gracilUma Stimpson. Proceed. Boston Soc. Nat. Hist., IV. p. 224. 

 Amphiura (^Ophiolepis) gracillima Lutken. Addit. ad Hist. Oph., p. 117. 



Special Marks. — Arms slender, not tapering till near the tip, often 

 twenty-four times as long as the diameter of the disk ; mouth-shields 

 angularly ovoid, long ; side mouth-shields not meeting within. 



Desa'lption of a Specimen. — Diameter of disk, 6°""- ; from outer side 

 of mouth-shield to outer corner of opposite mouth-slit, 2"""- ; width of 

 arm without spines, .6""- ; length of arm about 140°""- ; distance from 

 outer side of mouth-shield to inner points of inouth-papilla3, to that 

 between outer corners of mouth-slits, 1.1 : 1. Mouth-papilla?, three on 

 each side, outermost one much the largest, stout, longer within than 

 without ; innermost one running upwards to the teeth, stout, rounded, 

 bead-like ; middle one similar in size and shape. Teeth seven, longer 

 than broad, stout, squarish, thickened at the middle point of the cutting 

 edge ; uppermost one longest. Mouth-shields longer than broad, five- 

 sided, presenting a rounded angle without ; narrower within than with- 

 out ; length to breadth, .6 : .4. Side mouth-shields small, short, irregu- 

 larly triangular, lying on the sides of mouth-shields, and not meeting 

 Avithin. Under arm-plates a little broader than long, squarish, with 

 rounded corners ; near base of arm, touching each other, but not over- 

 lapping ; length to breadth (sixth plate), .3 : .4 ; about two thirds out 

 on arm, the plates are nearly separated by side arm-plates, and are pen- 

 tagonal, with a sharp angle within ; lateral sides nearly straight, and 



