70 BULLETIN 84, UNITED STATES NATIONAL MUSEUM. 



radius. The radial shields are narrow, elongated, almost four times longer than 

 wide, with a convex internal side and a sharply pointed proximal apex. Their 

 length is inferior to half the radius of the disk; distally, they are contiguous on 

 about one-third of their length, and, proximally, they are separated by a few rows 

 of plates, but they are not very divergent. 



The under face of the disk is covered all over with very thin, imbricated, and 

 equal plates, which uninterruptedly succeed those of the upper face. The genital 

 slits are narrow. 



The mouth shields are lozenge-shaped and longer than wide, with four equal 

 sides and rounded angles, especially the lateral angles, which are very obtuse. The 

 adoral plates, of middling size, are triangular, with three more or less concave sides ; 

 they are widened outwardly, and one can see a thin blade which separates the mouth 

 shield from the first lateral brachial plate. The oral plates are low. The oral 

 papillae, amounting to three, are subequal, short, rather thick with a blunt point; 

 the internal papilla, however, is a little more elongated than the other two. 



One can scarcely distinguish on the middle of the upper face of the arms 

 the dark longitudinal line indicated by Ljungman. The dorsal plates are large 

 and extremely wide, at least three times wider than long, with an almost straight 

 proximal side, a wider distal side, which is sometimes a little depressed in its middle, 

 and strongly rounded lateral sides joining the two other sides by angles which 

 are also rounded. These plates are sometimes split into two lateral halves by a 

 furrow near their middle, and sometimes the number of pieces is even larger, owing 

 to there being two or three irregular furrows. All these plates are contiguous. 



The first under brachial plate is fairly long, triangular, with a truncated proximal 

 angle and a strongly convex distal side. The succeeding ones are pentagonal, 

 much wider than long, with a very obtuse and rounded proximal angle, and straight 

 sides which meet by rounded angles. 



The lateral plates are little protruding. They carry three fairly wide, flattened 

 slightly lanceolate spines, the point of which is obtuse and rough ; these spines are 

 about the same length and they equal the article. 



The tentacular scales, two in number, are subequal and rather large; the exter- 

 nal scale, supported by the lateral brachial plate, is rounded ; the internal one, which 

 is inserted on the ventral plate, is more elongated. 



A, lufkeni has been classified by Ljungman in the genus Amphipholis which, 

 according to him, included such species as have three oral papillae on each side, the 

 external papilla being either wider or narrower than the other two. As, in 

 A. lufkeni, the three papillae are subequal, this species must be placed in the section 

 Amphiodia of Verrill. 



AMPHIODIA (=AMPHIURA) PtTLCHELLA (Lyman). 



Amphiura pulchella LYMAN (69), p. 337. 

 Amphiura pulchella LJUNOMAN (71), p. 648. 

 Amphiura pulchella LYMAN (75), pi. 5, fig. 75. 

 Amphlura pulchella LYMAN (82), pp. 125 and 147. 

 Amphiodia pulchella H. L. CLARK (01), p. 248. 



Albatross station 2765. Jan. 12, 1885. Lat. 36 43' S.; long. 56 23' W.; 

 10.5 fathoms; s. brk. sh. Five specimens. 



