. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 237 most papilla (perhaps more properly the tentacle scale of the outer oral tentacle) very long, slender, spiniform, and acute; the other two are similar but shorter. First under arm plate very large, hexagonal, a little broader than long; second plate larger, pentagonal,-much broader than long; third plate smaller than second but similar; succeeding plates similar but much smaller and tending to become squarish; all the plates are widely separated. Side arm plates very large, all but first
. Bulletin - United States National Museum. Science. NORTH PACIFIC OPHIURANS IN NATIONAL MUSEUM CLARK. 237 most papilla (perhaps more properly the tentacle scale of the outer oral tentacle) very long, slender, spiniform, and acute; the other two are similar but shorter. First under arm plate very large, hexagonal, a little broader than long; second plate larger, pentagonal,-much broader than long; third plate smaller than second but similar; succeeding plates similar but much smaller and tending to become squarish; all the plates are widely separated. Side arm plates very large, all but first two or three pairs much longer than high, meeting broadly both above and below; each plate carries three arm spines, of which the uppermost is smooth, acute, and equals the joint, while the lower two are shorter and rough at the tip. Tentacle pores large; tentacle scale single,small, spiniform. Color (dried from alcohol), dirty- whitish. Locality.—Albatross sta- tion 4775, Bering Sea, lat. 54° 33'30" N.; long. 178° 44' E., 584 fathoms, green mud, black specks, foram- inifera, bottom tempera- ture °, 1 specimen. Type.—Cat. No. 25739, , from station 4775. Although there is every indication that this speci- men is very young (except the size of the genital slits), it reveals certain characters that are so dis- tinctive it seems best to give it a name. The mouth parts and the un- usually long (for this family) side arm plates are quite remarkable and will make the species easy to recognize. OPHIACANTHA MEGATRETA, new Disk wanting, but jutlging from the scars on bases of arms, it was about 25 mm. in diameter; arms about 115 mm. long, beyond disk scars. Upper arm plates more or less rhombic, ^\^th rounded angles, a Meyac, signifying big, and rpTjzSf, signifying pierced through; that is, with big holes, in reference to the conspicuous tentacle Fig. 112.—OPHIACANTHA macrarthra. X'2o. «,fromahove; 6, FROM below; c, .side view of two arm joint
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