MUSEUM OF COMPARATIVE ZOOLOGY. 229 



Amphiura lsevis sp. nov. 



Plate IV., Tigs. 18-21. 



Special Marks. — Disk flat ami thin, nut lobed, covered with small thin 

 scales. Radial shields narrow and closely joined. Eight mouth-papillae to 

 each angle. A light line along upper side of arm. 



Description of an Individual. — Diameter of disk G.5 mm. The arms 

 (which were broken) were flattened, not very wide (1.2 mm), gradually 

 tapering, and seemed to have been not less than eight times the diameter of 

 disk. Eight mouth-papilke to each angle, of which the two outer on either 

 side are scale-like and larger than the others, which are stout and blunt; the 

 outer papilla rests on the side mouth-shield ; the others are supported by the 

 mouth-frames. Mouth-shields spear-head shaped ; length to breadth .(J : .4. 

 Side mouth-shields long triangular, meeting within, and closely joined to 

 mouth-shields. Under arm-plates wide pentangular, with the odd angle in- 

 ward ; slightly separated by side plates; length to breadth (8th plate) .4 : .G. 

 Side arm-plates meeting below and encroaching above ; forming but a slight 

 crest laterally. Upper arm-plates wider than long ; bounded by a wide 

 curve within, but nearly straight without ; length to breadth (2d plate) 

 .5 : .9.. Disk unusually thin and flat, with a fine line of juncture along its 

 rim, between the scaling of upper and lower surfaces. Scales very thin and 

 fine, without central rosette of primary plates ; near edge of disk nine or 

 ten scales in 1 mm. long ; half-way to centre, four; and in the interbrachial 

 spaces below, seventeen. Radial shields rather long, narrow, closely joined 

 except at the inner tips, which are separated by three little scales ; length to 

 breadth of each 1.2 : .3. Arm-spines three, nearly equal, cylindrical, taper- 

 ing, rather slender ; lengths to that of an upper arm-plate .4, .5, .4 : .5. 

 Tentacle-scales two, wide and thin with a curved free edge ; they arc set at 

 right angles, one on the side arm-plate, the other on the side of the under 

 arm-plate, beyond which it projects. Color, in alcohol, brown-gray, with a 

 light line along upper arm, and obscurer light cross-lines between joints. 



This species approaches nearest to A. gracillima, suii/ifis, Januarii, and 

 pulchella, but differs in several respects, especially in having eight mouth- 

 papillae to each angle. 



Philippines ; C. Semper. 



Ophionephthys phalerata sp. nov. 



Plate VI., Figs. 7 - 9. 

 Special Marks. — Arm-spine, next the lowest one. much stouter than the 

 rest and with thorns at the end. Disk naked, except a belt of fine scales 

 round each pair of radial shields. No tentacle-scales. 



Description of a Specimen. — Diameter of disk 9 mm. Arms very long. 



