220 BULLETIN OF THE 



Station 36, 84 fathoms, 5 speciimns. 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 Ltm. 



Ophiomiisium sci-ratum, Bull. Mus. Comp. Zo»31. Vol. V. No. 7, Pt. L p. 109, PL \. 



Figs. 23-25. 1878. 



Sigsbee, off Havana, 480 fathoms, 1 specimen (var. ?). Sigsbee, off Havana, 

 242 - 450 fathoms, 5 specimens. 



Ophiomusium eburneum Lym. 



OpMormisium eburneum, Bull. Mus. Comp. Zool. Vol. I. No. 10, p. 322. 1869. 



111. CataL Mus. Comp. Zool. No. VI. PL II. Figs. 1-3. 1871. 



Sigsbee, off Havana, 175 fathoms, 2 specimens. Sigsbee, off Havana, 127 

 fathoms, 1 specimen (var. ?). Station 20, 220 fathoms, 1 specimen. 



OPHIOLIPTJS * gen. nov. 



Entire animal covered with a thick, smooth skin, which more or less obscures 

 the underlying plates. Mouth-papillae ; teeth ; no tooth-papilloe. 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. 53 - 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 18 nun. Length 

 of arm 75 mm. Width of arm 4.5 mm. Five large, close-set, irregularly 

 rounded mouth-papillae 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 une([ual si/.c. Mouth-shields small, longer than broad, with a rounded angle 

 inward, oufi;r edge rounded, and slight lobes on the lateral corners ; length 

 to breadth 2: 1.5 mm. Side mouth-shields nuuh obscured by the thick skin, 

 narrow within, where they nearly or (juitc meet, broader without, and ex- 

 tending to the genital opening. First under aiiii-])late very small, rounded 

 quadrangular; the next two are large, iinich wiilcr wilhuut than within, and 



• '0015, simko ; XIttos, groa-se. 



