30 BULLETIN OF THE 



slightly angular, covered with small, thin, irregular, overlapping scales ; there 

 are six large, widely separated primary plates, one round one in the centre, sur- 

 rounded by five others broader than long. Radial shields large, longer than 

 wide, of an elongated pear-seed shape, their pointed inner ends being separated 

 by two small, angular scales. Interbrachial space on the under surface covered 

 by fine overlapping scales, smaller than those above. Four arm-spines standing 

 close together on the side arm-plates ; they are about as long as an arm-joint, 

 and rather slender and tapering, except the one next the lowest, which is 

 fitrongly swollen at the base. Large round pores, but no tentacle-scales. 

 Color, gray. 



Station 64, 2650 fathoms, 1 specimen. 



* 



Amphiura canescens sp. nov. 



riate XII. Figs. 332-334. 



Special Marks. — Five mouth-papillae on each side, of which the three mid- 

 dle ones are longest ; point of mouth-angle occupied by the lowest tooth. Two 

 tentacle-scales. Three arm-spines about as long as a joint. 



Description of an Individual {StaXion 171). — Diameter of disk 5 mm. Arms 

 long and slender. Width of arm, close to disk, without spines, 1 mm. Five 

 stout, blunt mouth-papillse on either side of the mouth-angle, the three middle 

 ones being longer, broader, and more flattened than the rest. One large, tri- 

 angular papilla, or tooth, at apex of jaw. Mouth-shields broad triangular, 

 with blunt angles and outer edge much rounded. Side mouth-shields long 

 and narrow, but slightly swollen, broader without than within, where they just 

 meet. First under arm-plate small, pentagonal, with an angle inward and 

 slight re-entering curves on the lateral sides ; the other basal plates are large, 

 with outer edge curved, and wider than the inner, and with lateral sides re- 

 enteringly curved. Side arm-plates not prominent, meeting neither above nor 

 below at the base of the arm. Upper arm-plates broader than long, transverse 

 oval, with lateral ends slightly pointed. Disk flat, but rather thick, its upper 

 surface covered with small, slightly swollen, irregularly shaped, overlapping 

 scales, about 5 in the length of 1 mm. where they are coarsest. Radial shields 

 blunt pear-seed shaped, slightly pointed within, separated by one large and 

 several small scales. Interbrachial spaces on the under surface covered by the 

 same kind of scaling. Three stout, tapering, bluntly pointed arm-spines, about 

 as long as a joint^ the lowest slightly longer than the others, placed close to- 

 gether on the side arm-plate. Two tentacle -scales, the one on the brachial 

 side small and narrow, the interbrachial one much larger, with wide, rounded 

 edge. Color in alcohol, nearly white. 



Station 171, 600 fathoms, 2 specimens. 



