130 BULLETIN OF THE 
and enclosed by the wide outer mouth-papille. Color in alcohol, very light 
gray. 
Other specimens had the disk-scales more regularly disposed than in Fig. 
159, and the radial shields pear-seed shape with an angle inward. 
Station 218, 1070 fathoms, 12 + specimens. 
OPHIOPHYLLUM*™ gen. nov. 
Disk extremely thin and flat, covered with scales and large radial shields, 
and bordered by a row of plates which are movable and attached by their 
inner margins. Mouth-papille arranged in a close row; no tooth-papille ; 
teeth. Arm-spines thin and broad, standing on outer edge of side arm-plate. 
Two genital openings in each interbrachial space. 
This singular genus has small relationship with amy other. The fringe of 
thin plates is like that found in Podophora among echinoderms. 
Ophiophyllum petilum sp. nov. 
Plate VII. Figs. 179-181, 
Special Marks, — Fringe-like border of disk consisting of about a dozen very 
thin plates in each interbrachial space. One arm-spine, which is wide and flat 
like a plate of the border. No tentacle-scale. 
Description of an Individual (Station 174).— Diameter of disk 6 mm. 
Width of arm, without spines, close to the disk 1.2 mm. Six small, short, 
square, close-set mouth-papill on either side of an angle, and three smaller 
diamond-shaped at the apex. Mouth-shields rather large fan-shaped, with a 
deep curve without and an angle within; length to breadth 1: 1.2. Side 
mouth-shields narrow, bounding the inner angle of the mouth-shield ; outer 
ends square, inner ends tapering and separated. First under arm-plate three- 
sided, with a rounded angle inward, lateral sides straight, and outer edge 
curved ; the rest are small and pentagonal, with an angle inward. Side arm- 
plates broad and thin, meeting below beyond the second under arm-plate, and 
just touching above beyond the third upper arm-plate. Midway of the arm, 
where it is highly arched, they form most of its covering. Basal upper arm- 
plates diamond-shaped ; those beyond become more or less triangular, with a 
sharp angle inward, and outer edge slightly rounded. — Disk flat and very thin, 
the centre covered with fine, thin, irregular scales; interbrachial space on 
margin filled by one large three-sided plate, with an angle inward and outer 
edge nearly straight. Radial shields large, three-sided, longer than wide, with 
outer angles slightly rounded, separated their entire length by a cluster of 
irregular scales larger than those of the centre; in the lower interbrachial 
* Udis, snake ; (0۷ leaf, 
