MUSEUM OF COMPARATIVE ZOOLOGY. 71 



scales. Genital openings edged with fine, closely set papillae, 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 size. Color in alcohol, gray. 



0. Icpida and its kindred species form an intermediate type between the 

 shallower, like 0. albida, and the deep-sea, of which 0. 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, 

 1 specimen. Station 343, 420 fathoms, 1 specimen. 



Ophioglypha Lj ungmani sp. nov. 

 PUte in. mg. 77. 



Special Marks. — Three arm-spines ; one long and high up, two short and 

 low do^vn. 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 mm. 

 Length of arm about 45 mm. ; width of arm without spines close to disk 2 mm. 

 Four or five short flat mouth-papillce on each side, and one or two longer pointed 

 papillae 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 Avithout, tapering within, 

 where they nearly or quite meet. First imder 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 i^lates. 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-scales below near the 

 mouth-shield ; along their lower free edge is a row of minute tooth-like papilla?, 

 between the genital plates and outside the mouth-shield. Interbrachial space 



