34 



OPHIURA APPRESSA. 



LIST OF SPECIMENS, 



Catalogue 

 Number. 



Orijrinal Number 

 Number.; of Spec. 



Locality. 



When 

 Collected. 



Whence obtained. 



Nature of 

 Specimen. 



108 

 109 

 110 



?1181 

 1055 

 1069 

 1188 



1188 



Museum of Comparative Zoology. 



Acapulco. 



Panama. 



Caj^e St. Lucas, Cal. 



Smithsonian Institution. 



Pan 



Panama. 



Cape St. Lucas, Cal. 



Cape St. Lucas, Cal. 



Alex. Ap;assiz. 

 Alex. Agasslz. 

 J. Xantus. 



Rev. T. Powell. 

 Mr. Sternberg. 

 J. Xantus. 

 J. Xantus. 



Alcoholic. 



Alcoholic. 



Ophiura appressa Sat. 



Oplnura apprefssn Say. Journ. Phil. Acad., Y. p. 151. 1825. 

 Ophioderma virescens Lutkex. Addit. ad Ilist. Oph,, p. 92. 



Special Marks. — Color grayish, or variously marbled dark green and 

 yellowish ; arm-spines nine, rather short, flattened ; arms stout ; mouth- 

 shields broad heart-shaped. 



Description of an Individual. — Diameter of disk, 16°"°" ; from outer 

 edge of mouth-shield to outer corner of opposite mouth-slit, 5.2"""- ; width 

 of arm without spines, 2.7°"°' ; length of arm, 62"™- ; distance from outer 

 edge of mouth-shield to inner points of teeth, to that between outer 

 corners of mouth-shts, 2.7 : 2.7. Mouth-papillae, eighteen to twenty to 

 each angle of jaw, strongly flattened, longer than broad, edges rounded ; 

 second, third, and fourth (from without), and also two innermost ones, 

 broader than the others ; outermost one of all romided, sharjD, tajDcring. 

 Teeth five, broad, stout, somewhat pointed ; uppermost one narrow and 

 sharp ; uppermost and lowest smaller than other three. Mouth-shields 

 very broad, rounded, heart-shape, length to breadth, 1.3 : 2 ; outer side 

 usually straight, or slightly re-entering ; corners cleanly rounded. Side 

 mouth-shields entirely covered, except a small rounded piece, connecting 

 mouth-shield with innermost arm-plate. Under arm-plates a little over- 

 lapping, longer than broad ; * m front rounded ; sides re-enteringly 

 curved, where tentacle-scales encroach ; mner laterals very short, and 

 sloping towards middle of arm ; inner side straight ; length to breadth, 

 twelfth plate, 1 : .8. First plate oval diamond-shape ; length to breadth, 

 .7 : 1. Second plate like those bej'ond, but rather shorter and wilder ; 



* The form of the arm-plates applies to the portion that can he seen without preparation ; 

 some parts are hidden by the tentacle-scales and the neighboring plates. 



