544 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [42] 



OpMoglypha Ljungmani Jjy man. 1878 (*?). 

 B. range, 843 to 1,467 fathoms. Common. 



This species is very closely allied to the preceding, and, like it, usually 

 has, when perfect, a few small spines scattered on the disk ; but the disk 

 is much thicker, and the arms higher at base. The mouth-shields are 

 larger and longer, emarginate laterally j disk scales coarser ; the jaws 

 more acute; mouth-papillae, four or five, short, flat rounded, except the 

 inner one, 



OpMomusium Lymani W. Thomson. 

 B. range, 238 to 2,033 fathoms (640 to 2,033 fathoms, 1883). Abun- 

 dant and large in many localities. 



OphiomusiurA armigerum Lyman. 1878. 

 B. range, 1,731 to 2,369 fathoms, 1883. Abundant locally. 



Ophiochlton grandis Verrill. 1884. 

 B. range, 888 fathoms, 1883. Eare. 



Ophiomitra spinea Verrill. 1885. 

 B. range, 2,038 fathoms, station 2,035, 1883. Two specimens. 



A large species resembling 0. valida. Arms five, long and stout; 

 disk flve-lobed, indented between the arms; radial shields moder- 

 ately large, irregularly ovate, with a small notch in the broad outer 

 end ; their inner ends are separated by a wedge of small scales, but the 

 outer ends are in contact, or nearly so ; disk-scales rather small, un- 

 equal, bearing small, low, conical spinules or granules; a few granules 

 on the outer end of radial shields and bases of the arms. Arm-spines, 

 eight or nine at base of arms, long, slender, acute, sharply thorny, aris- 

 ing from prominent side plates; the middle spines are the largest and 

 roughest; the rows do not meet above at base of arms. Mouth-shields 

 rhombic, with incurved lateral margins; the inner angle acute, the 

 outer one obtuse or rounded; side mouth-shields thickened, crescent- 

 shaped ; tentacle- scale rather large, those at base of arm wide, flat, and 

 obtuse; farther out lanceolate and rather acute. Mouth-papillse nu- 

 merous, unequal, rather irregular and crowded at the outer mouth-angles, 

 where they form two or more rows ; in the largest example there are 

 eighteen to twenty, or more, in each angle; in the smaller one about 

 twelve; they are mostly rather slender, spiniform, or papilliform, the 

 outermost one wider and more flattened. The larger specimen has the 

 disk 14°'"^ in diameter ; the smaller one, 11™™. , 



OpMaGantliaMdentata(Re,tz.)'L}xmg.', Lyman (joans) "Challenger" Ophiu- 

 roidea. 



Ophiacantha spinulosa (M. andTr.) Lyman, Illus. Catalogue Mus. Comp. Zoology. 



B. range, 40 to 351 fathoms (101 to 351 fathoms, 1883). Common north- 

 ward, in moderate depths, from Massachusetts Bay to Greenland. 

 The form here intended is the same as that described and figured by 



