128 OPHIUROIDEA. 
2. Ophiacantha spectabilis. 
Ophiacantha spectabilis, G. O. Sars, Forh. Vid.-Selsk. Christ. 1871 
(1872), p. 10; Lyman, Chall. Rep. Oph. (1882) p. 198 ; Hoyle, Proce. 
R. Soc. Ed. xii. (1884) p. 714. 
A rather large species. Disk pretty thickly covered with more 
or less short spines. Arm-spines smooth, seven or eight in number, 
radiating in all directions, and some as much as 5 mm. long; the 
uppermost have sharp, the lower blunt ends. Mouth-papille from 
four to eight; mouth-shields rounded triangular, wider than long ; 
side mouth-plates rather large. A single tentacle-scale on all but 
the most distal joints, where there may be two. Diameter of disk 
14 mm.: RB is said to be =4r, 
Colour, in spirit, whitish; “ uniformiter fulvus vel castaneus, 
nullas maculas vel fascias obscuriores ostendens ” (Sars). 
Reported by Hoyle from the Faeroe Channel. 
Distribution. Norway; 80-433 fms. 
3. Ophiacantha abyssicola. 
Ophiacantha abyssicola, G. O. Sars, Forh. Vid.-Selsk. Christ. 1871 
(1872), p. 8; Lyman, Chall. Rep. Oph. (1882) p. 199; Hoyle, 
Proc. R. Soc, Ed. xii. (1884) pp. 711-713. 
A small species, with the arm-joints so constricted as to give them 
a knotted appearance. Disk almost smooth. Arm-spines smcoth, 
seven near base, fewer more distally, the longest the uppermost, 
gradually but considerably diminishing in size to the lowermost; the 
longest as much as 2mm. The arms most remarkable for their 
moniliform appearance, each arm-joint being much wider along 
its distal than its proximal edge. Three or four mouth-papille 
very prominent and distinct. Mouth-shield constricted in its outer 
half by the invasion of the bursa] slits. A single tentacle-scale. 
Diameter of disk 9mm. R is said to be = 107. 
Colour, in spirit, white ; ‘‘ uniformiter pallide ferrugineus, brachiis 
interdum fasciis obscurioribus transversis indistincte ornatis” (Sars). 
Distribution. Northern parts of East Atlantic, and Arctic Circle. 
20-312 fms. 
a, 6. Faeroe Channel, 312 fms. ‘Porcupine’ Exp. (St. 82), 
c-f. Faeroe Channel, 290 fms. ‘Porcupine’ Exp. (St. 78). 
OPHIOCOMID i (see p. 26). 
1. OPHIOCOMA. 
Ophiocoma, Ag. Mém. Soc. Neuchdt, i. (1836) p. 192; M. Tr. Syst. 
Ast, (1842) p. 98; Lyman, Ill. Cat. M. C. Z. i. (1865) p.70; Norm. 
Ann. § Mag. xv. (1865) p. 111; Lyman, Chall. Rep. Oph. (1882) 
p- 167. 
