36 BULLETIN OF THE 



Amphilepis norvegica? Ljn. 



AmpTiilepis norvegica. Of. Kong. Akad. Oph. Viv., 1866, p. 322. 



Station 45, 1240 fathoms, 1 specimen. Station 46, 1350 fathoms, 3 specimens. 



So far as one may judge, without having a proper series, these are the adult 

 of Ljungman's original. They have the disk as large as 9 mm. The radial 

 shields are pretty large and separated, and there is no tentacle-scale. 



OPHIACTIS. 



TABLE OF SPECIES HEREIN DESCRIBED. 



Note. — Following these descriptions will be found the species previously known and brought back 

 by the " Challenger," namely, O. asperula, O carnea, O. Savignyi, and O Mulleri. 



Skin thick and much obscuring the scaling and mouth-shields. Radial shields narrow ) q j.ggiiig„g 

 and small. Five short, thick, blunt, flattened arm-spines. ) 



Disk-scales distinct and naked, without spines. Three stout, blunt, tapering, cylin- J 

 drical arm-spines. One large, flat mouth-papilla on each side. Teeth lobed. Five [ O flexuosa. 

 arms. ) 



Disk-scaling coarse, and with few or no spines. Three or four stout, blunt, tapering ) q -usmdata 

 arm-spines Two or three mouth -papillae on each side. Teeth lobed. ) ' 



Disk-scales coarse, and set with numerous short spines. Radial shields short and \ 

 triangular. Four stout, cylindrical, tapering arm-spines. One mouth-papilla on each r O. naina. 

 side. Five arms. ) 



Disk finely scaled, and set with short, minute spines. Radial shields small and pear- \ 

 seed shaped. Four moderately stout, tapering arm-spines, the uppermost longest. | O. hirta* 

 Two or three minute mouth-papillae on each side. Seven arms. ) 



Disk-scales coarse and thick, with large radial shields. No spines, except a few near J 

 the margin. Four rather long and slender arm-spines, the upper one longest Two \ O. poa* 

 mouth papillai on each side. ) 



Disk-scales larger in centre, where primary plates may be distinguished in a rosette. ^ 

 No spines, or only an occasional minute one on the margin. Three or four rather long | canotia. 

 and tapering arm-spines. Two mouth-papillae on each side. ) 



Of the above seven species, the first belongs with the shallow-water type of O. Savignyi; the rest 

 come under the type of O. Balli, whose species often inhabit the deep sea. 



Ophiactis resiliens sp. nov. 



Plate XIII. Figs. 363-364, 



Special Marks. — Skin thick and -much obscuring the scaling and mouth- 

 shields. Eadial shields narrow and small. Five short, thick, blunt, flattened 

 arm-spines. 



Description of an Individual (Port Jackson). — Diameter of disk 6.5 mm. 

 Length of arm 38 mm. Width of arm near disk 1.5 mm. Mouth-angle very 

 small and short, carrying on either side two small, flat, squarish papillae, and, 

 at its apex, a third, rounded, with a minute point like the teeth. Mouth-shields 

 small, of a transverse oval shape ; length to breadth .7 : .5. Side mouth-shields 

 rather small and curved, broader without than within, where they meet. 

 Under arm-plates small and rounded, about as long as broad, having outer side 

 curved and inner side with ill-marked angles. Side arm-plates projecting in a 

 strong spine-ridge. Upper arm-plates flat, transverse oval in form, about twice 

 as broad as long. Disk covered below by a thick, naked skin, and above by 



