NORTH PACIFIC OPllIUUANS IN NATIONAL MUSEUM CLARK. 



201 



OPHIACANTHA RHACHOPHORA, new species.a 



This species is so close to the two preceding; that a detailed descrip- 

 tion would be quite superfluous. Its only specific peculiarities lie 

 in the very rough arm spines (except the uppermost), tentacle 

 scales, and even oral papilhe. In extreme cases the tips of the distal 

 oral papillse bear several teeth or little thorns, and the tentacle 

 scales are sharp pointed with a thorn or two on each side. Other 

 specimens liave these peculiarities less marked and approach very 

 near to pentagona, and I do not feel sure that rhacJwphora is anything 

 more than a slight variety of that species. For the present, how- 

 ever, I think it well to 

 distinguish it by a sepa- 

 rate name. 



Localities. — Albatross 

 station 3698, off Mana- 

 zuru Zaki, Honshu Is- 

 land, Japan, 153 fathoms, 

 green mud , volcanic- 

 ashes, sand, 1 specimen ; 

 station 3717, ofT Ose 

 Zaki, Honshu Island, Ja- 

 pan, 63 to 100 fathoms, 

 volcanic sand, shells, 

 rocks, 2 specimens; sta- 

 tion 3750, off Suno Saki, 

 Honshu Island, Japan, 

 83 to 140 fathoms, gray 

 sand, broken shells, peb- 

 bles, 1 specimen; station 

 4771, Bering Sea, lat. 

 54°30'N.; long. 179° 17' 

 E., 426 fathoms, broken 

 shells, bottom tempera- 

 ture 38.1°, 2 specimens; 

 station 4772, Bering wSea, 

 lat. 54° 30' 30" X.; long. 179° 14' E., 344 to 372 fathoms, green- 

 brown sand, 1 specimen; station 4775, Bering Sea, lat. 54° 33' 30" 

 N.; long. 178° 44' E., 584 fathoms, green mud, black specks, 

 foraminifera, bottom temperature 37.2°, 16 specimens; station 

 4809, Sea of Japan, lat. 41° 36' 12" N.; long. 140° 8' 40" E., 90 to 

 207 fathoms, gray sand, pebbles, broken shells, 12 specimens; sta- 

 tion 4893, Eastern Sea, lat. 32° 32' N.; long. 128° 32' 50" E., 95 to 

 106 fathoms, gray sand, broken shells, pebbles, bottom tempera- 



a 'Paxoc, signifying a briar, and <l)op&, signifying a carnjinf/, in reference to tlie very 

 thorny arm spines and tentacle scales. 



Fig. 92. —OPHIACANTHA RHACHOPHORA. X 8- 0, FROM ABOVE: 6, 



FROM below; c, side a'iew of two arm joints near disk. 



