228 BULLETIN OF THE 



small lobes in the interbrachial spaces ; covered above and below with minute 

 overlapping scales. Eadial shields long, curved, and very narrow, a little wider 

 without, but tapering inward, separated their entire length. Genital openings 

 long, extending from the mouth-shield to the margin of disk. Ten or twelve 

 flattened, smooth, bluntly pointed arm-spines, as long as a joint, arranged in a 

 close line along the outer edge of the side arm-plate ; those above and below 

 longer than the three middle ones. Tentacle-scales blunt dagger-shaped, and 

 similar to arm-spines, but smaller. Color in alcohol, pale gray, mottled with 

 reddish-brown. 



Sigsbee, off Havana, 175 fathoms, 1 specimen. 



Ophiopsila Biisei Ltk. 



OpMopsila rUisci, Addit. ad Hist. Oph. Pt. II. p. 136. 1869. 

 Station II, 37 fathoms, I specimen. Key West, Fla., 3 specimens. 



Ophioplax Ljungmani Ltm. 

 Ophioplax Ljungmani, 111. Catal. Mus. Comp. Zoiil. No. VIII. Pt. II. p. 22, PI. 

 II. Figs. 24, 25. 1875. 



Station 45, 101 fathoms, 12 -f specimens. Sigsbee, off Havana, 127 fath- 

 oms, 1 specimen. Sigsbee, off Havana, 80 fathoms, 1 specimen. 



Ophiopsepale Goesiana Ljn. 



Opliiopccpah Goesiana, Of. Kong. Akad. Dr. Goes Oph. p. 615. 1871. 



Station 45, 101 fathoms, 1 specimen. Sigsbee, off Havana, 80 fathoms, 2 



specimens. Sigsbee, off Havana, 177 fathoms, 1 specimen. Sig.sbee, off 



Havana, 242 fathoms, I specimen. Sigsbee, off Havana, 127 fathoms, 3 



specimens. 



Ophiomyees frutectosus Ltm. 



Ophiomyccs frutectosus, Bull. Mus. Comp. Zoiil. I. No. 10, p. 345. 1869. 



Sigsbee, off Havana, 119 fathoms, 6 specimens. 



Ophiacantha aspera sp. nov. 



Plate I. Figs. 10 -IS. 



Special Marks. — Disk closely set with fine stumps, many of them forked. 

 One large flat tentacle-scale, bearing long thorns, which give it a palmated 

 look. Nine or ten slender, thoi'uy, translucent arm-spines. 



Description of an Individual (off Havana). — Diameter of disk 5 mm. Width 

 of arm close to disk, without spines, 1.8 mm. Seven round pointed mouth- 

 papilkc to each angle, the one at the apex being a little larger ; the outer one is 

 sometimes flattened, with a toothed end. Mouth-shields small, sli^^jhtly swollen, 

 triangular, with a sharp angle witliin, and the oiiter edge much rounded ; 

 length to breadth .7 : .7. Side mouth-shiehls large, short, and broad, nearly 

 semicircular, with curved edge outward, just touching Avithin. Under arm- 

 pLites small .sliicM-sliapcd, wider without than within, where they present an 

 obtuse angle ; lateral sides re-enteringly curved. Side arm-platea large, with 



