20 OPHIOCNIDA FILOGRANEA. 



either side, and a curve without, where it is widest ; length to breadth, 

 .8 : .9. Side arm-plates robust, and nearly or quite meeting above and 

 below. Upper arm-plates broader than long, bounded by a strong curve 

 within, and by a gentle one without ; length to breadth, .5 : .7. Disk cov- 

 ered with large, but not swollen scales, whereof the central primary one is 

 conspicuous, having a diameter of .6™"-. In a line between it and the inner 

 ends of the radial shields there are only three scales. Radial shields pear- 

 seed shape, diverging inward and touching only at their outer extremities ; 

 separated by a wedge of two or three scales ; length to breadth, .7 : .3. Arm- 

 spines, near disk, four ; stout, rounded, tapering, blunt, of nearly equal length, 

 which to that of an under arm-plate is .5 : .7. Tentacle-scales two, small, 

 rounded, placed at right angles, one on the under, the other on the side 

 arm-plate. 



Color, in alcohol, nearly white. 



Hassler Expedition; Barbadoes, 100 fathoms. Brazil? 



Amphmra chilensis? Ltk. 



Opidolepis chilensis. Mull, and Trosch. Wieg. Archiv. IX. 120. 

 PI. V. f. 77. 



A specimen from Talcahuano Bay, Chili, agrees well with the description 

 and with my notes on the original at Berlin, except that the arms of this 

 specimen are shorter, and the tentacle-scales larger. The description of 

 Miiller and Troschel says one tentacle-scale, but the specimen in the Berlin 

 Museum has ttvo. 



Ophiocnida filogranea sp. nov. 



Outline figures 88, 89. 



Special Marks. — Close set granules along margin and on a part of inter- 

 brachial spaces of disk. Radial shields very wide and short, and joined along 

 their whole length. Three mouth-papillce on each side, the innermost one 

 stoutest. Arms long and slender. 



Description of an Individual. — Diameter of disk, 7™°'. Width of arm with- 

 out spines, l.l""""-. Length of arm, 72°™- Mouth-papillae six to each mouth- 

 angle ; the innermost two are largest, run iipwards to the teeth, and are 

 rounded ; the next on either side is smaller and spiniform, and the outermost 

 is flat with a curved edge. Mouth-shields small, longer than broad, five-sided. 



