SEA LILIES, STARFISHES, ETC. — CLARK. 9^ 



Family OPHIOLEPIDID^. 



Genus Amphiophiura, Matsumoto. 

 Amphiophiura collet ai, sp. nov. 

 (Plate XXX vii., fig. 1-2.) 



Disk 17 mm. in diameter; arms all broken, but one is 

 nearly 50 mm. long and indicates a probable length of 55 mm. 

 or more. Disk covered by a coat of 21 large, flat, smooth 

 scales and the 10 radial shields, between which, in the angles, 

 are much smaller, more or less triangular scales ; many of 

 these little scales and some of the larger show a narrow, 

 marginal border as though cemented down to the neighbouring 

 plates ; primary plates very distinct, about 2.5 mm. across, 

 but not conspicuous. Radial shields, 3-4 mm. long and 

 nearly or quite as broad, irregularly rounded triangular, 

 smooth, the inner ends separated by a large scale, but the 

 distal inner corner of one distinctly overlapping the corre- 

 sponding corner of the other for more than a milUmeter. 

 Basal upper arm plate about twice as broad as long ; second 

 and third at least three times as broad as long ; the succeeding 

 7 or 8 plates are tetragonal, wider than long, broadly in 

 contact, with distal margin convex and much wider than 

 proximal ; beyond the tenth joint the upper arm plates tend 

 to become triangular, as long as broad, and separated from 

 each other, the condition they show on distal half of arm. 

 Interbrachial areas below covered by the oral shield, a large 

 marginal plate, wider than long and 5 smaller, somewhat 

 swollen plates, between them. Genital plates large, more than 

 a milhmeter wide at the upper end, bearing an arm -comb of 

 about 25 low, triangular papillae, placed closely side by side ; 

 there are no papillae on the arm plates. 



Oral shields oval, sharply pointed proximalty, 4 mm. long 

 by 3 mm. wide ; adoral plates, short, three times as long as 

 broad, meeting fulty and closely within ; oral plates larger 

 than adorals, only slightly swollen. Teeth only 4, triangular. 

 Oral papillae only 3 on a side, borne wholly on the oral plates ; 

 the innermost is Uke the teeth, but narrower, while the other 

 two are very wide and notched like the molar teeth of a dog. 

 Oral tentacle-pore (the second or distal one, of course) opens 

 entirely outside mouth slit, at distal end of oral plate ; its 

 inner side is guarded by 4 papillae, its outer by 6. First under 

 arm plate large, octagonal, much wider than long ; second 

 longer and narrower, hexagonal, about as long as wide ; 



1. *:oA,X)yTo'9= glued together; in reference to the appearance of the- 

 disk plates. 



