12 Ol'lIIOGLYPIIA SINENSIS. 



of mouth-slit to Inner point of inoutli-papilla;, to that between outer 

 corners of mouth-slits, 2.2 : 2.4 ; mouth-shields small, rounded, narrower 

 without, length to breadth, 1.1 : .8 ; side mouth-shields small and not 

 meeting within ; two large swelled mouth-papilhu at the inner apcK 

 of the angle ; they are pressed close together and present a re-entering 

 grinding surface ; above, and partly covered by them, a swollen ir- 

 regular tooth, followed by three more which are squeezed together 

 and more or less thickened ; al)ove these again are four ilat, square- 

 edged teeth separated from each other, the uppermost are longest. 

 Outside each mouth-papilla stands the thick, clul>-like tentacle-scale of 

 the first mouth-tentacle ; alx)ve which, and nearly hidden in the mouth- 

 slit, is the tooth-like scale of the second mouth-tentacle. Under arm- 

 plates small, nearly square, with slightly re-entering sides ; length to 

 breadth (0th plate), .8 : .8. Upper arm-plates small, nearly round, but 

 farther out on the arm, the inner side is straight ; length to breadth 

 (12th plate), .8 : .9. Arm-spines 9 (near base of arm 10), white, flat- 

 tened, upper ones broadened towards the end, like a narrow spatula ; 

 lowest one broadest and stoutest, next two or three above it narrower 

 than the rest; length of uppermost, .S"""- ; 7th, 1.2"""-; lowest, 1""" to- 

 wards point of arm, 5 or 6 spines which are flat and taper to a blunt 

 point. No tentacle-scales ; tentacles large and long. Disk pufly and 

 lobed, covered alx)ve and below with fine, regular scales, about HO to 

 a square '""' ; beset above and below with numerous stout, ilattcned, 

 spines, .S"™' long, and resembling the arm-spines. Radial-shields small, 

 inclining to crescent-shape, separated and standing just over base of 

 arm; length to l)readth. 2.0:1. Color, in alcohol: disk gray; arms 

 straw color. 



Collected, almost without doubt, at Hong Kong, by Captain W. H. A. 

 Putnam. 



This handsome species is an Ampkiura with a thorny disk ; and T 

 therefore place it in Opliiocmdu, as an approximation to its natural 

 position, without as.«erting that its affinities are thus exactly expressed. 

 See Bulletin of the Mus. Comj). Zool., Vol. I. p. 335. 



Ophioglypha sinensis. Sr. nov. 



Plate I., figs. 1, 2. 



Special Marks. — A pit or deiJi'ession between the side arm-^Jates, on 

 the under side of the joints within the disk (as in 0. lacertosa). Only 

 one tentacle-scale on most of the pores beyond the disk. An arm-comb 

 along the edge of the radial-scale, but none on the arm itself 



