230 BULLETIN OF THE 



to fourteen stout, more or less spinii'orm moutli-papilla) to each angle, whereof 

 the outer are longer ; at the apex of jaw are one or two papilla) which are largest 

 of all. Mouth-shield much broader than long, with an obtuse, rounded angle 

 within, outer edge slightly lobed, and lateral sides curved ; length to breadth 

 .7 : 1.5 mm. Side mouth-shields long, oval, stout, meeting within, the outer 

 edge being broadly connected with the first under arm-plate, which is larger 

 than usual, with a small lobe without. Those beyond are shield-shaped, longer 

 than broad, wider without than within, where they present an obtuse angle ; 

 while the outer side is strongly curved, and the laterals re-enteringly curved, 

 and outer edge, which is wider than inner, gently curved. Side arm-plates 

 large, with a prominent spine-ridge, meeting fully above and below. Upper 

 arm-plates small, of a transverse diamond-shape, with outer and inner angles 

 more or less rounded. Disk flat and thin, covered with delicate spines, which 

 obscure the scaling. Radial shields small and wide, joined their entire length, 

 with a rounded angle inward, and lateral edges nearly straight. Nine very 

 slender, glassy, long, gently tapering, thorny arm-spines, the upper one longest 

 and equal to three arm-joints. Tentacle-scales long, sharp, dagger-shaped, and 

 situated on the inner edge of the tentacle-pore. Color in alcohol, straw. 

 Station 29, 955 fathoms, 1 specimen. 



Ophiacantha Troscheli Ltm. 



Ophiacantha Troscheli, Bull. Mus. Conip. Zool. Vol. V. No. 7, p. 142, PI. IX. Figs. 

 223, 224. 1878. 



Station 45, 101 fathoms, 3 specimens. 



Ophiacantha vepratica Lym. 



Ophiacantha vepratica, Bull. Mus. Comp. Zool. Vol. V. No. 7, p. 137, PI. X« Figs. 

 245-247, 1878. 



Station 41, 860 fathoms, 2 specimens. 



I am unable to see any reliable specific difference between these specimens 

 and those got by the " Challenger" in 600 fathoms near the Fiji Islands. 



Ophiacantha pentacrinus Ltk. 



OphiacantM pcntacriyius, Addit. ad Hist. Oph. PI. 111. pp. 46, 99. 1869. 

 Ophiacantha meridionalis Lym., Bull. Mus. Comp. Zool. Vol. I. N. p'. 324. 1869. 



Station 43, 339 fathoms, 9 specimens. Station 44, 539 fathoms, 1 specimen. 

 Sigsbee, off Havana, 175 fathoms, 1 specimen. 



Ophiacantha hirsuta Ltm. 



Ophiacantha hirsuta. 111. Catal. Mus. Comj). Zool. VIII. Pt. II. p. 12, PL II. Figs. 

 21-23. 1875. 



Sig.sbec, off Havana, 175 fathoms, 1 specimen. Sigsbee, off Havana, 127 

 fathoms, 3 Hpecimens. 



