194 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



more or less numerous, minute, thorny stumps. (In specimens 

 smaller than the type, in addition to the thorny stumps, the scales at 

 the center of the disk carry long, sharp, thorny spines; a specimen 8 

 mm. across the disk has a cluster of fourteen such spines, 1.5 to 2 mm. 

 long.) Radial shields very large, twice as long as wide, smooth and 

 bare, closely joined; in small specimens they are not so closely ap- 

 pressed, and there may even be several little stumps between them. 

 Basal upper arm plates tetragonal and in contact, about twice as 

 wide as long, with smooth distal margins; they rapidly become broader 

 and shorter, widely separated, and somewhat pentagonal with proxi- 

 mal-lateral angles rounded, with distal margin minutely thorny. 

 Interbrachial spaces below covered with scales, most of which carry 

 the minute thorny stumps. Oral sliields small, somewhat rhombic, 

 but with angles a little rounded, the distal one curiously drawn out 

 into a sort of stem, connecting with the interbrachial space. Genital 

 slits very large. Adoral plates extraordinarily large, quadrant- 

 shaped, closely appressed to each other, as well as to the oral shield; 

 oral shields and adoral plates may carry thorny stumps; oral plates 

 indistinct. Oral papillae spiniform and very numerous, about fifteen 

 on each side. First under arm plates small and squarish; succeeding 

 plates, two or three times as wide as long, distinctly separated, of a 

 very peculiar shape, with a proximal angle and a remarkable distal 

 projection; at first this projection is smooth, but beyond the first 

 few basal joints it becomes more and more rough and thorny, and at 

 the middle of the arm it is a thorny lump. Side arm plates large, 

 meeting above and below; each plate carries nine or ten straight, 

 rather sharp spines, the upper ones smooth, but the middle and lower 

 ones more or less thorny; the next to the uppermost, or the uppermost, 

 is longest and may equal five joints. Tentacle scales variable; on 

 first two or three basal tentacle pores there are three (rarely four) 

 long, somewhat spatulate, smooth spine-like scales; on the next few 

 joints there are two such scales and then there is only a single 

 scale, which is short and thorny. Color (dried from alcohol), nearly 

 white. 



Localities. — Albatross station 4893, Eastern Sea, lat. 32° 32' N.; 

 long. 128° 32' 50" E., 95 to 106 fathoms, gray sand, broken shells, 

 pebbles, bottom temperature 55.9°, 3 specimens; station 4901, East- 

 ern Sea, lat. 32° 30' 10" N.; long. 128° 34' 40" E., 139 fathoms, gray 

 sand, broken shells, bottom temperature 52.9°, 1 specimen; station 

 4903, Eastern Sea, lat. 32° 31' 10" N.; long. 128° 33' 20" E., 107 to 

 139 fathoms, gray sand, broken shells, bottom temperature 52.9°, 3 

 specimens; station 4933, Eastern Sea, lat. 30° 59' N.; long. 130° 29' 

 50" E., 152 fathoms, rocky, bottom temperature 56°, 2 specimens; 

 station 4934, Eastern Sea, lat. 30° 58' 30" N.; long. 130° 32' E., 103 

 to 152 fathoms, rocky, 18 specimens; station 4939, Kagoshima Gulf, 



