MUSEUM OF COMPARATIVE ZOOLOGY. 71 
scales, Genital openings edged with fine, closely get papilla, growing larger 
as they pass upwards along the outer edge of genital Scale, which is long, 
narrow within, broad without, and divided in several pieces. Three short and 
blunt arm-spines, situated low on the side arm-plates, close to the tentacle- 
pores, and one long tapering spine, just below the junction of the upper arm- 
plate. Tentacle-scales short and rounded ; to each mouth-tentacle seven on the 
interbrachial side, and three longer and tapering on the brachial edge ; beyond 
there are at first five on the interbrachial and four on the brachial edge, after 
which they diminish rapidly in number and ize, Color in alcohol, gray. 
O. lepida and its kindred species form an intermediate type between the 
shallower, like O, albida, and the deep-sea, of which O. bullata is the extreme. 
Station 46, 1350 fathoms, 5 specimens, Off Bermuda, 750 fathoms, 2 
specimens. Station 76, 900 fathoms, 4 specimens. Station 45, 1240 fathoms, 
l specimen, Station 343, 420 fathoms, 1 specimen. 
Ophioglypha Ljungmani sp. nov. 
Plate XXX. Fig, 77. 
Special Marks, — Three arm-spines ; one long and high up, two short and 
low down. Radial shields separated ; disk-scales small and curved. Disk 
thin, with rather delicate scales. Arms slender, 
Description of an Individual (Station 122). — Diameter of disk 8.5 mma. 
Length of arm about 45 mm. ; width of arm without spines close to disk 2 mm. 
Four or five short flat mouth-papille on each side, and one or two longer pointed 
papilla at apex of jaw. Mouth-shield rounded triangular, or inclining to 
rounded pentagonal, with an angle inward, longer than broad, outer edge 
curved, Side mouth-shields very narrow, wider without, tapering within, 
where they nearly or quite meet. First under arm-plate broad triangular, 
with lateral corners truncated and outer edge curved ; second, third, and fourth 
plates widely pentagonal, with an angle inward; beyond these they are small, 
broader than long, with an obtuse angle inward and a curved outer edge. 
Side arm-plates slightly projecting at their outer edge, meeting broadly below 
beyond the disk ; separated above by the upper arm-plates, which are hex- 
agonal, with lateral sides straight and two outer angles nearly blended in a 
curve. Disk smooth, covered with small irregular plates, but little swollen. 
Radial shields pear-seed shape, somewhat overlapped by adjoining scales, just 
touching without, diverging within, where they are separated by two or three 
small plates, The rest of the upper disk is occupied by numerous scales, 
among, and separated by which, appears a central cluster of primary plates ; 
in the interbrachial spaces are usually one or more larger plates near the mar- 
gin of the disk. Genital scales very broad above and without, where they 
carry an arm-comb of fine spines, but buried by disk-seales below near the 
mouth-shield ; along their lower free edge is a row of minute tooth-like papillae, 
between the genital plates and outside the mouth-shield. Interbrachial space 
