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AMPIllURA GRACILLIMA. 



Amphiura filiformis Forbes. 



Asterias Jiliformis O. F.MvL,i^ER. Zool. Dan. Prodr. 1776. 

 Ophiura filiformis Lamk. Hist. Anim. sans Verteb., II. p. 546. 

 Amphiura filiformis Forbes. Linn. Trans., XIX. p. 1.01. 184.3. 

 Ophiolepis filiformis Mull. & Trosch. Syst. Asterlden, p. 94. 



LIST OF SPECIMENS. 



■Amphiura graciUima Lutken. 



Ophiolepis graciUima Stimpson. Proceed. Boston See. Nat. Hist., IV. p. 224. 

 Amphiura {Ophiolepis") graciUima Lutkex. Addit. ad Hist. Oph., p. 117. 



Special Marhs. — 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. 



Description 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, .G™- ; length of arm about 140'°'°- ; distance from 

 outer side of mouth-shield to inner points of mouth-papillce, to that 

 between outer corners of mouth-slits, 1.1 : 1. Mouth-papillfe, 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, longet- 

 than broad, stout, squarish, thickened at the middle pomt 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 

 within. 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 



