MUSEUM OF COMPARATIVE ZOOLOGY. 125 



Length of arm about 12 mm. "Width of arm close to disk, Avithout spines, 

 1.2 mm. Seven small, short, rounded mouth-papilla) to each mouth-angle, the 

 inner one longer and more prominent. Three- squarish teeth, the upper one 

 very small. Mouth-shiekls broader than long, inner angle broad and rounded, 

 lateral corners rounded, and outer edge much curved ; length to breadth .7 : .0. 

 Side mouth-shields large, somewhat swollen, square, and wide without ; taper- 

 ing slightly inward, where thej^ just meet. First under arm-plate rounded and 

 conspicuous ; the plates beyond are short pentagonal, wath an angle inward. 

 Side arm-plates thick and somewhat flaring outward, meeting broadly below 

 and also above beyond the first, which is broader than long, four-sided, with 

 slight re-entering curves on the lateral sides and outer corners rounded ; beyond, 

 the plates are pentagonal, with an obtuse angle inward, and lateral and outer 

 sides straight. Disk thin and sunken, and contracted in the interbrachial 

 spaces, covered with small overlapping plates ; in centre are six rudely 

 angular primaries, separated in the interbrachial spaces by several minute 

 rounded scales. Radiaf shields large, longer than broad, swollen, raised above 

 the surrounding scales, having a long angle inward and outer angles rounded ; 

 separated their wlutle length liy an inner and outer wedge, each composed of 

 two small quadrangular plates ; length to breadth 1.5 : .8 : each shield touches 

 that of the neighboring pair by its interbrachial edge, and is separated without 

 by a marginal wedge-like scale. Lower interbrachial space with a row of scales 

 on the margin, the central one being larger with edges rounded, its inner edge 

 touching the mouth-shield. Genital scales short and thick, composed of two 

 or three angular pieces. Five short, blunt, tapering arm-spines, about two 

 thirds as long as an arm-joint, extending along the entire edge of the side arm- 

 plate. One pointed tentacle-scale, so minute as to be seen with difficulty. 

 Color in alcohol, pale brown. 



Station 192, 129 fathoms, 1 specimen. 



OPHIOZONA Ltm. 

 Ophiozona stellata sp. nov. 



Plate VI. Figs. 147, 148. 



Special Marks. — Two short arm-spines placed low on the plate, the lower 

 one twice as long as the upper. Arm somewhat flattened, side arm-plates not 

 swollen. Radial shields small, irregular, widely separated. 



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

 Length of arm about 35 mm. "Width of arm close to disk, without spines, 

 1.8 mm. Four squarish close-set mouth-papilla) on each side, and two longer 

 and more pointed at angle of jaw. Four short stout teeth, the lowest thickened 

 and rounded. Mouth-shields three-sided, with a long angle within, and outer 

 edge much curved ; length to breadth 1.8 : 1.8. Side mouth-shields short and 

 thick, wide without; tapering to a point within, where they just meet. First 

 under arm-plate very small, transverse oval in form ; second plate wider 



