1885.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 443 



Ophiacantha granulifera Verrill. 



Verrill, Amer, Journ. Sci., xxix, p. 153, 1885. 

 Verrill, Eeport U. S. Fish Com. for 1883, p. 44, 1885. 



Disk five-lobed, covered with small, rounded and conical, slightly 

 rough granules ; radial shields form ten rather prominent ridges, naked 

 only at the rounded and prominent outer end ; interbrachial spaces be- 

 neath scaly, with few granules. Arms rather broad. Arm spines eight 

 to nine at base of arms, the rows not approximating dorsally ; the upper 

 oues are long, very slender, acute, slightly roughened ; the middle ones 

 are stouter and distinctly thorny; the lower ones much shorter; ten- 

 tacle-scale small, lanceolate, subacute, except on the two first joints, 

 where they are obtuse and flattened, and sometimes two together; side 

 arm-plates broadly united ventrally ; ventral arm-plates unusually 

 broad and short, especially on the second to seventh joints, where they 

 are transversely oblong, the outer margin nearly straight or slightly 

 cmarginate, the inner edge with a slight median angle ; farther out 

 they become longer, narrower, and somewhat trapezoidal. Mouth- 

 shields small, somewhat cruciform, with a small outer lobe, an obtuse 

 inner angle, and acute lateral lobes. Side mouth-shields larger, broad, 

 strongly curved, thickened, and minutely granulose. Mouth-papillse 

 all spiuiform, three or four on each side, besides a larger one below the 

 teeth. Color light brownish yellow, with darker blotches on the arms. 

 Diameter of disk, O"'™ to 11""™. 



Easily distinguished bj^ the short, wide ventral arm-plates and the 

 small, close granules on the disk. 



Off Nova Scotia, in 101 to 200 fathoms. 



Ophiacantha enopla Verrill. 



Verrill Amer. Journ. Sci., xxix, p. 1.53, 1885. 

 Verrill, Eeport U. S. Fish Com. for 1883, p. 44, 1885. 



Easily distinguished by having numerous mouth-papillse, the outer 

 oues forming a crowded group at the end of the mouth-angles. The 

 disk is covered with small, obtuse or rounded, granule-like stumps, 

 slightly spinulated at the end. The arm-spines are long and slender, 

 glassy, seven or eight near the base of the arms, forming a nearly con- 

 tinuous band on the dorsal side. Color in life, orange. 



Off Martha's Vineyard, stations 1122, 1124, 2046, etc., in 351 to 640 

 fathoms, 1882, 1883, 1884. 



Ophiacantha aculeata Verrill. 



Verrill, Amer. Journ. Sci., xxix, p. 153, 1885. 

 Verrill, Report U. S. Fish Com., p. 45, 1885. 



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 0. hidentata. End 



