[45] ALBATROSS EXPLORATIONS. 547 
Ophiacantha abyssicola G. O. Sars. 
B. range, 1,000 to 1,608 fathoms, 1883. Not uncommon. Very closely 
allied to the next, and perhaps identical. 
Ophiacantha millespina Verrill. 1879. 
B. range, 100 to 1,917 fathoms, 1883. Abundant and widely diffused. 
Ophiacantha aculeata Verrill. 1885. 
B. range, 1,346 to 1,395 fathoms, 1883. 
A large species, with five unusually long, gradually tapering arms. 
Disk rounded and swollen, throughout evenly covered with small, 
slender, elongated spinules, having rough sides and terminated by four 
to six slender, rough, divergent points. These disk-spinules are less 
crowded, smaller, longer, and more slender than in O. bidentata. End of 
radial shields not exposed. Arm-spines very long, slender, nearly 
smooth, eight or nine at base of arms, those next to the edge of disk 
decidedly longer and forming an almost continuous band above. Ten- 
tacle-scales rather wide, but with acute tips at base of arms, rapidly 
becoming smaller and acute-lanceolate farther out. Mouth-shields 
rather small, rounded externally, and not extending much on the inter- 
brachial spaces, obtuse-angled on the inner side. Jaws broader and 
more obtuse than in most species. Mouth-papille rather slender, usu- 
ally three or four on each side of a jaw, besides the median one; the 
outer one is largest, broad and flat at base, rapidly narrowed toward 
the acute end ; the next two are more slender, spiniform, and acute; 
sometimes an additional smaller one stands out of line, behind those in 
the regular row. Color, light orange or buff. Diameter of disk of a 
large example, 17™™; length of arms, 110™", Stations 2034 and 2105, 
in 1,346 to 1,395 fathoms, on Brisinga elegans V. 
Ophiacantha anomala G. O. Sars. 
B. range, 101 to 131 fathoms, off Nova Scotia, 1883. Not common ; 
chiefly northern. 
This species is easily recognized by having regularly six arms. The 
disk is covered with rather large and coarse stump-like spinules, 
rough at the obtuse or rounded summit. 
_ Ophiacantha spectabilis G. O. Sars. 
B. range, 131 fathoms, off Nova Scotia, 1883. One specimen only. 
This species has smoothish, tapering, acute spines ou the disk. The 
mouth-papillz are slender, tapering, and acute. 
Ophiacantha crassidens Verrill, Amer. Journ. Sci., February, 1885. 
B. range, station 2115, in 843 fathoms, off Cape Hatteras. 
This large species is easily distinguished by its disk, covered with 
small, conical, acute spines, and by the remarkably large, rough, and 
thick mouth-papilla, which are crowded. The arm-spines are rather 
short and blunt. The color is dark brown in alcohol. 
