220 BULLETIN OF THE 
Station 36, 84 fathoms, 5 specimens.  Sigsbee, off Havana, 80 fathoms, 
1 specimen.  Sigsbee, off Havana, 175 fathoms, 2 specimens. — Sigsbee, 
Lat. 26° 31/ N., Long. 85° 3’ W., 119 fathoms, 2 specimens, Sigsbee, off 
Havana, 127 fathoms, 1 specimen, 
Ophiomusium serratum Lym. 
Ophiomusium serratum, Bull. Mus. Comp. Zoól, Vol. V. No. 7, Pt. I. p. 109, PI. I. 
Figs. 23-25. 1878. 
Sigsbee, off Havana, 480 fathoms, 1 specimen (var. ?). — Sigsboe, off Havana, 
242 - 450 fathoms, 5 specimens. 
Ophiomusium eburneum Lym. 
Ophiomusium eburneum, Bull. Mus. Comp. Zoöl. Vol. I. No. 10, p. 322. 1869. 
111. Catal. Mus. Comp. Zoól. No. VI. Pl. II. Figs. 1-3. 1871. 
Sigsbee, off Havana, 175 fathoms, 2 specimens. Sigshee, off Havana, 127 
fathoms, 1 specimen (var. ?). Station 20, 220 fathoms, 1 specimen. 
OPHIOLIPUS * gen. nov. 
Entire animal covered with a thick, smooth skin, which more or less obscures 
the underlying plates. Mouth-papilla ; teeth ; no toot h-papilleo. Tentacle-pores 
only at the basal under arm-plates ; beyond these there are none. Upper arm- 
plates rudimentary and scarcely calcified. Two genital openings in each inter- 
brachial space. 
Despite its thick, uncalcified skin, this genus stands very near Ophiomusium, 
from which, however, it is further separated by the rudimentary upper arm- 
plates, which consist only of thin disconnected, irregular fragments, 
Ophiolipus Agassizii sp. nov. 
Plate III. Figs. 52-54. 
Special Marks. —Tentacle-pores only at the second and third under arm-plates. 
Genital openings bounded on either side by a close row of angular granules. 
No arm-spines except at the tip of arm, where there are two minute ones, 
Description of an Individual (Station 49). — Diameter of disk 18mm, Length 
of arm 75 mm. Width of arm 4.5 mm. Five large, close-set, irregularly 
rounded mouth-papille on each side, the two outer ones largest ; and three more 
pointed at apex of the jaw. Five or six spiniform teeth, irregularly set, and 
of unequal size. Mouth-shields small, longer than broad, with arounded angle 
inward, outer edge rounded, and slight lobes on the lateral corners ; length 
to breadth 2:1.5 mm. Side mouth-shields much obscured by the thick skin, 
narrow within, where they nearly or quite meet, broader without, and ex- 
tending to the genital opening. First under arm-plate very small, rounded 
quadrangular ; the next two are large, much wider without than. within, and 
* "Opus, snake ; Airos, grease. 
