200 



Locality, Panama. Rev. T. Powell. 



Smithsonian Institution, No. 1051. 



There is a specimen in the Smithsonian Institution (No. 1055) 

 which may be the young of this species ; it has the arms some- 

 what longer, however, in proportion, and the pattern of the color 

 is quite different ; the mouth-shields also are more rounded. It 

 is from Panama. 



Ophiopholis, (Miill. & Trosch.) 

 Ophioj^hoUs Kennerlyi^ (Lyman,) sp. nov. 

 Description of a Specimen. Diameter of disc, 8 millim. Outer 

 edge of mouth-shield to outer corner of opposite mouth-slit, 3.4 

 millim. Width of arm, without spines, 2 millim. Length of arm, 

 35.3 millim. Mouth-papilla thin, flat, square, with corners 

 rounded ; three on each side. Teeth short, broad, square, stout. 

 Mouth-shields very closely soldered with side mouth-shields ; 

 rather small, nearly oval ; length to breadth, .7:1. Under arm- 

 plates nearly square, corners a little rounded, and outer side 

 bounded by a slightly reentering curve ; length to breadth, 1:1. 

 Side arm-plates small, and little prominent. Upper arm-plates 

 irreo-ular oval, sometimes broken in two, more or less encroached 

 on by supplementary pieces, which bound their outer and lateral 

 sides ; length to breadth, near base of arm, .8 : 1.5. The supple- 

 mentary pieces form a close line ; they are thick and angular, 

 vary somewhat in size, and, near base of arm, from seven to ten 

 in number ; further out, fewer ; and, near the tip, none at all. 

 Disc, above, closely and evenly covered with round grains, among 

 which appear a few small, round, primary plates ; one in centre 

 and one or two in each brachial space ; none at all in the inter- 

 brachial spaces ; diameter of central plate, .7 millim. Disc, be- 

 low, closely set with short, stout, smooth spines, about .3 milHm. 

 long. Arm-spines very stout, short, thick, rounded ; the longest 

 about length of arm-joints ; lowest one much the shortest, blunt, 

 conical ; 2d spine same shape, but longer ; 3d and 4th longest, 

 broad, thick, and blunt ; 5th same shape, but shorter ; usually 5 

 spines, sometimes, close to disc, 6 ; near tip of arm the lower 

 spine has the form of a double hook. Color, in alcohol : purplish 

 pink, with obscure bands of a darker shade on arms ; an obscure 

 line of whitish running lengthwise of the arms ; in the position of 



