334 BULLETIN OF THE 



sionally as many as eight, while the other group has three or four. "When 

 we can be sure of the full value of the characters these two divisions will 

 doubtless appear as geiierically distinct. 



Amphiura grandisquama Lyman, pp. nov. 



Special Marks. — Five arm-spines, the lowest much the longest, and a 

 little bent. One rounded tentacle scale, larger than is usual in the genus. 

 Six mouth-papillae to each mouth-angle, of which two are above the others 

 in the mouth-slits. 



Description <>f u Specimen. — Diameter of disk Gram. The arms, which 

 were broken, had been not far from 28 mm. long. Of the six mouth- 

 papilla?, to each mouth-angle, the innermost are stout and rounded, and 

 stand side by side at the apex of the angle, running upwards to the teeth ; 

 the outer ones are very stout and taper to a blunt point, and one stands 

 on the inner edge of each side mouth-shield ; the intermediate ones are 

 smaller and sharp spiniform, and are high up in the mouth-slit. Teeth 

 flat, rather stout, with a cutting edge, a little curved. Mouth-shields 

 broad, rounded diamond shape, more obtuse without than within ; length 

 to breadth .5 : .1. Side mouth-shields long triangular, small, not meet- 

 ing within. Under arm-plates broader without than within ; bounded 

 without by a curve ; on the sides by re-entering curves, which incline 

 toward the median line ; the inner laterals arc short and nearly meet on 

 the median line, so that the inner side is very small ; length to breadth 

 (6th plate) .5 : .5. Side arm-plates encroaching somewhat both above and 

 below. Upper arm-plates extending quite across the arm, broader than 

 Long; they have a clean curve without, and a broken curve within, and 

 these meet, on either side, in an obtuse point; length to breadth (3d plate 

 from disk) .5 : .6. Disk covered with fine, overlapping scales, above and 

 below, which are coarsest near the centre of the disk, anil finest under- 

 neath ; near the edge, above, there are about 100 to a square mm. Radial 

 shields narrow; wider within than without, their side turned toward the 

 other nearly straight ; the opposite side curved; they are separated by a 

 narrow wedge; of two or three long scales; length to breadth 1 : .1 : their 

 size varies with the encroachment of the disk scales. Arm-spines five; 

 further out on arm, four ; rounded, tapering regularly, little or not at all 

 swelled at the base; lowest one longest, and generally a little bent; 

 lengths to that of the under arm-plate (7th joint) .0, .7, .7, .7, 1 : .5. 

 Tentacle scale large, and round oval, resembling that in Ophionereis ; 

 length to that of the under arm-plate .2 : ■■•■ Color, in alcohol, pale brown, 

 with alight spot at the outer end of each radial shield. 

 ( Ml Tennessee Reef, in 1 7-1 fathoms. 

 The species belongs to the same group as its neighbor, A. Stimpsonii, but 



