MUSEUM OF COMPARATIVE ZOOLOGY. 89 



length by a round plate without and several smaller plates within. Inter- 

 brachial space below chiefly covered by the great mouth-shields, outsiele which 

 are three or four rows of small scales, and on either side a genital scale, bearing 

 on the free edge broad, square, close-set papillce, which become narrower where 

 they form the arm-comb, on the broadened outer end of the genital scale. 

 Three small sharp arm-spines, one situated in a notch well up on the outer 

 edge of the side arm-plate, the other two lower, near junction of side with 

 under arm-plate. Tentacle-pores very large, transverse oval in shape ; on 

 those of the mouth-tentacles four rounded scales on the under arm-plate, and 

 •three on the other side ; the other pores within disk have usually four- on 

 the inner side, and one wide scale on the outer. Color in alcohol, body gray, 

 arms straw-color. 



Station 157, 1950 fathoms, 4 specimens. 



Ophioglypha radiata sp. nov. 



Plate III. Figs. 65, 66. 



Special Marks. — Two minute arm-spines. Mouth-shield trefoil. Under 

 arm-plates axe-shape. Radial shields small and rounded. Disk high. Basal 

 under arm-plates about as long as broad. Arms high and rounded. 



Description of an Individual (Station 205). — Diameter of disk 8.5 mm. 

 Length of arm 35.5 mm. Width of arm close to disk 3 mm. Four or five 

 wide, rectangular, closely set mouth-papilUe on either side, with three long and 

 pointed at ape.x of jaw. Mouth-shields large, trefoil-shape, with a pointed lobe 

 inward. Side mouth-shields very narrow, of even width and meeting within. . 

 First under arm-plate largest of all, triangular, with an angle within and outer 

 edge much curved ; the other plates are axe-shaped, with re-entering lateral 

 sides and curved outer side ; the first three touch each other. Side arm-plates 

 thick, swollen, and minutely tuberculous, meeting on the under surface beyond 

 the third plate. Upper arm-plates much swollen, the first two rounded hex- 

 agonal, those beyond rounded triangular. Disk high and rounded, covered with 

 fine overlapping scales, of which the marginal are the larger. Rxdial shields 

 small, broader than long, four-sided, with rounded corners, outer edges straight, 

 touching nearly their whole length, diverging inward, where they are separated 

 by a small triangular plate. There are small round primary plates, widely 

 separated by the finer disk-scales. Genital scales short, wider without than 

 within, bearing along their entire margin long, flat, and closely set papillae, 

 about fourteen in number ; those towards upper surface much narrower than 

 the under ones. Two very minute arm-spines, one situated low on the edge of 

 the side arm-plate, next the tentacle-pore, the other half-way up the arm. 

 Tentacle-scales curved ; from three to four on either side of the large pores on 

 the basal joints. Color in alcohol, pale yellow. 



Station 205, 1050 fathoms, G specimens. 



