76 BULLETIN OF THE 



curved. Disk higli, covered with rather thin, irregular, curved plates, among 

 which may be seen a central five-sided primary, and a large wide plate on the 

 margin of the disk, much broader than long. Radial shields rudely semi- 

 circular, and meeting only at their outer points, diverging inward, where they 

 are separated by a small triangular plate. The interbrachial space on the 

 under surface is covered by the rather long and narrow genital scales, which 

 are broken in two, and bear no papilla), and by two large irregularly curved 

 plates, between which and the mouth-shield are from one to three little scales. 

 Arm-si^ines three, short, very small, conical, situated half-way on the outer 

 edge of the side arm-plate. Tentacle-pores, except the first pair, small and 

 narrow. The first bears about three scales on each side f the second, the 

 same : the third, two ; and the fourth, one minute scale on the outer and two 

 on the inner side. Color in alcohol, disk pale gray, arms white. 

 Station 224, 1850 fathoms, 1 specimen. 



Ophioglypha costata sp. nov. 



Plate IV. Figs. 93-94. 



Special Marks. — Three very short, blunt, peg- like arm-spines, evenly spaced. 

 Disk-scales few and large. Radial shields long and separated. Papilla) of 

 ann-comb close-set, flat, and with rounded ends. 



Description of an Individual (Station 142). — Diameter of disk 6.5 mm. 

 Width of arm close to disk 1.3 mm. Mouth-papillae five or six on each side, 

 short, square, close-set, with one larger, diamond-shaped, at apex of jaw. Mouth- 

 shield five-sided, with outer edge curved, lateral sides nearly straight, and 

 an obtuse angle within ; length to breadth 1:1. Side mouth-shields rather 

 short, lying along inner angle of mouth-shield, meetuig within. First under 

 arm-plate broad triangular, with an angle within and curved outer edge ; the 

 rest are pentagonal, broader than long, with an obtuse angle within, short 

 lateral sides, and a long curved outer edge. Side arm-plates a little swollen 

 and constricted at their inner end, meeting below ; separated above for the 

 first three joints by the upper arm-plates, of which the first is transverse oval ; 

 the second four-sided, with a curved outer edge much wider than the inner ; 

 and the rest triangular, with an angle within and curved outer edge. Disk 

 rather flat, and covered by angular plates and a few small rounded scales, 

 closely overlapping ; in centre a five-sided rosette of primary plates, which are 

 rounded and partly separated by minute scales ; in the interbrachial spaces a 

 single or double row of larger and smaller plates. Radial shields rhomboidal, 

 with the angles slightly rounded ; length to breadth 2:1; separated without 

 by a large diamond-shaped plate, with its outer and inner angles truncated. 

 The lower interbrachial spaces have a large marginal i)late and four or five 

 smaller ones ; geiutal scales wide, bearing on their free edge a close-set row of 

 fine papillaj, which grow somewhat larger and more rounded above to form the 

 arm-comb. Three arm-spines, minute, blunt, and equally spaced. Tentacle- 

 scales short an^ squarish, five on one side and three on the other of the pores 



