52 BULLETIN OF THE 



plates about as broad as long, of a short diamond-shape, with angles rounded, 

 rising on the median line in a low ridge and microscopically tuberculous. Disk 

 round and flat, scarcely lobed in interbrachial spaces, more or less closely beset 

 above and below with minute stumps bearing an irregular crown of thoriis; 

 on the radial shields they are much more scattered, smaller, and less thorny, 

 and next the genital openings there are none. The radial shields, whose out- 

 lines are distinguishable through their covering, are triangular and very large, 

 with a small lobe where they unite over the arm ; inwardly they diverge, and 

 sometimes again bend together so as nearly or quite to reunite ; length to breadth 

 9 : 4.5. On joints next disk there are nine slender, glassy, translucent, slightly 

 flattened feebly thorny spines, whereof the uppermost are extremely long and 

 elegant; those below progressively shorter; lengths to that of an underarm- 

 plate, 15.5, 15, 13, 9, 7, 6, 5, 3, 1.7 : 1.7. One small, blade-like tentacle-scale 

 in the angle of the under and side arm-plates. Color in alcohol, above, pale 

 brownish pink ; below, very pale yellowish brown ; along upper side of arm 

 is a wide, brown stripe, whose edges are darkest. 



Station 204, 100-115 fathoms, 3 specimens. Cebu ; 100 fathoms. 



0. capUlaris belongs near 0. comata and 0. Suensonii It has an arm-stripe 

 like that of the former, but has little stumps on the disk instead of hair-like 

 spines. 



Ophiothrix berberis sp. nov. 



Plate XV. Figs. 435-428. 



Special Marks. — Seven short, blunt, much flattened, strongly toothed arm- 

 spines. Radial shields and interbrachial spaces below nearly or quite naked. 

 Rest of disk set with short stumps bearing a crown of thorns. 



Description of an Individual (Station 192). — Diameter of disk 9 mm. Width 

 of arm near disk 2.5 mm. Length of arm about 68 mm. The vertical oval 

 has about seventeen stout, blunt, nearly equal tooth-papillae, whereof the mar- 

 ginal ones are scarcely longer than those in the middle. Three squarish, rather 

 thin teeth. Mouth-shields broader than long, with an obtuse angle inward and 

 a gentle curve without ; length to breadth, 1 : 1.5. Side mouth-shields rather 

 narrow, slightly swollen, wider without than within, where they scarcely meet. 

 First under arm-plate unusually large, nearly equalling the second, squarish, 

 with rounded corners and an obtuse angle within. The plates increase in size 

 to the seventh, which is broader than long, bounded without by a wide curve, 

 and within by a truncated angle ; length to breadth .7 : 1.1. Side arm-plates 

 furnished with a low thick spine ridge. Upper arm-plates transverse diamond- 

 shaped, overlapping, having outer angle rounded and inner one truncated ; 

 length to breadth .7 : 1.4. Disk rather flat, lobed in the interbrachial spaces, 

 which, below, are nearly naked, as are the radial shields, while the remainder 

 of the upper disk is densely covered with short, minute stumps, each bearing a 

 crown of three or four thorns, or, rarely, a fork of two longer thorns. Radial 

 shields long triangular, just touching without, diverging gently inward ; length 

 to breadth 2.7 : 1.7. Seven, short, blunt, much flattened arm-spines, bearing 



