. Bulletin - United States National Museum. Science. 168 BULLETIN 75, UNITED STATES NATIONAL MUSEUM, Localities.^Albatross station 5053, Siiruga Gulf, lat. 34° 49' 20" N.; long. 138° 40' 15" E., 503 fathoms, green mud, bottom tempera- tm-e °, 1 specimen; station 5054, Suruga Gulf, lat. 34° 52' 45" N.; long. 138° 42' 20" E., 282 fathoms, green mud, broken shells, foraminifera, bottom temperature °, 2 specimens, without disks; station 5088, Sagami Bay, lat. 35° 11' 25" N.; long. 139° 28' 20" E., 369 to 405 fathoms, green mud, bottom temperature Â
. Bulletin - United States National Museum. Science. 168 BULLETIN 75, UNITED STATES NATIONAL MUSEUM, Localities.^Albatross station 5053, Siiruga Gulf, lat. 34° 49' 20" N.; long. 138° 40' 15" E., 503 fathoms, green mud, bottom tempera- tm-e °, 1 specimen; station 5054, Suruga Gulf, lat. 34° 52' 45" N.; long. 138° 42' 20" E., 282 fathoms, green mud, broken shells, foraminifera, bottom temperature °, 2 specimens, without disks; station 5088, Sagami Bay, lat. 35° 11' 25" N.; long. 139° 28' 20" E., 369 to 405 fathoms, green mud, bottom temperature °, 1 speci- men. Bathymetrical range, 282 to 503 fathoms. Temperature range, ° to °. Four specimens. Type.âCat. No. 25587, , from station 5053. The extremely slender arms and tlie characteristic mouth parts, taken in connection with tlie radial shields, three arm spines and two tentacle scales, make this an easy species to recognize. As the disks are wanting in the specimens from station 5054, it is, of course, possi- ble that their identification as rhadinobracMus is Fig. 74.âAmphioplus rhadinobrachius. X 8. a, from above; h, from below; c, side \iew of THREE ARM JOINTS NEAR DISK. AMPHIOPLUS ACANTHINUS, new ; Disk 14 mm. in diameter; arms about 140 mm. long. Disk some- what decagonal (the decagon with somewhat convex sides), lightly notched radially, and deeply so interradially; covered with a close coat of very numerous scales, some of wdiich bear slender acute spines one-half millimeter long; these spines are set into little pits, so that when they are rubbed off their former position is clearly indicated. Radial shields small, divergent, but in contact distally. Upper arm plates tetragonal or pentagonal with more or less rounded corners, twice as wide as long or more, broadly in contact basally but barely touching on terminal part of arm. Interbrachial spaces below covered by nuicli finer scales than the dis
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