MUSEUM OF COMPARATIVE ZOOLOGY. 83 



outer side, the latter being sometimes in two pieces ; beyond the disk there 

 arc on each pore a larger and a smaller short curved scale. Color in alcohol, 

 light brown. • 



Station 145, 310 fathoms, 1 specimen. 



Ophioglypha buUata Wtv. Thom. 



Ojjhiotjhjphabullata'WYV. Tuom., Nature, Vol. YIII. p. 400, Sep., 1873, with figure. 

 "Voyage of the "Challenger." The Atlantic, I. p. 400, with figures. 



Plate III. Figs. 85, 86. 



Special Marks. — Three minute, evenly spaced arm-spines. Disk-scales above 

 rounded, and of various sizes, with large marginal plates. Disk high. Basal 

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



Description of an Individual (Station 61). — Diameter of disk 11 mm. 

 Length of arm 23 mm. Width of arm close to disk 2 mm. Four or five 

 small, conical, widely separated mouth-papillae on each side, and three larger 

 at apex of jaw. Mouth-shield very large, long pentagonal, with an obtuse 

 angle inward much wider without than within ; outer lateral corners rounded ; 

 length to breadtli 2.7 : 2.3. Side mouth-shields pointed oval, small, meeting 

 widely within. First under arm-plate triangular, with sharp angle inward and 

 outer edge curved ;-the rest within the disk four-sided, with inner edge slightly 

 wider than outer, and lateral side a little re-enteringly curved ; beyond they 

 gradually become wide hexagonal. Side arm-plates swollen, not meeting below 

 till half a dozen joints beyond the disk ; separated above by upper arm-plates, 

 which are much swollen, forming a high ridge ; the first two or three nearly 

 square with rounded corners ; those just beyond rounded hexagonal ; and only 

 near the middle of the arm do they become triangular, with an angle within 

 and outer edge curved. Disk thick and arched ; in centre of upper surface 

 a cluster of six large, round primary plates, separated by an irregular row of 

 smaller ; between inner ends of radial shields and in each interbrachial space 

 a conspicuous round plate ; on tlie margin are two plates connecting outer ends 

 of genital scales, and within these a large plate connecting outer ends of radial 

 shields ; rest of upper surface covered with small, swollen, rounded scales. 

 Radial shields longer than broad, rounded pear-seed shape, forming a well- 

 marked notch over arm ; separated their entire length by a single or double 

 row of rounded scales ; length to breadth 2.7 : 2. The under interbrachial 

 space is occupied by the large mouth-shield, the lower edges of the two small 

 marginal plates, and the large genital scales, which are very narrow within, 

 widening without, as they extend upward over the arm, bearing on the free 

 edge a close row of square, flat papilla?, which begin at the third arm-plate and 

 maintain the same shape in the arm-comb. Three minute pointed arm-spines, 

 evenly spaced ; the lowest next the tentacle-scales. Tentacle-pores oval and 

 very large ; four short rounded scales on each side of mouth-tentacles ; the 

 rest, within and well beyond the disk, have four or more on the inner side, and 



