108 BULLETIN 75, UNITED STATES NATIONAL MUSEUM. 



6 specimens; station 3342, off British Columbia, lat. 52° 29' 30" N.; 

 long. 132° 38' W., 1,5SS fathoms, gray ooze, coarse sand, bottom tem- 

 perature 35.3°, 24 specimens; station 3704, off Honshu Island, 

 Japan, 94 to 150 fathoms, fine volcanic sand, 5 specimens; station 

 4933, Eastern Sea, lat. 30° 59' N. ; long. 138° 29' 50" E., 152 fathoms, 

 rocky, bottom temperature 56°, 38 specimens ; station 4956, off eastern 

 Japan, lat. 32°32' N. ; long. 1 32° 25' E., 720 fathoms, green-brown mud, 

 fine gray sand, foraminifera, bottom temperature 37.5°, 10 specimens; 

 station 4969, off eastern Japan, lat. 33° 23' 40" N.; long. 135° 38' E., 

 587 fathoms, brown mud, sand, stones, bottom temperature 38.9°, 

 6 specimens; station 4971, off eastern Japan, lat. 33° 23' 30" N.; 

 long. 135° 34' E., 649 fathoms, brown-green mud, foraminifera, 

 bottom temperature 38.1°, 7 specimens; station 4976, off eastern 

 Japan, lat. 33° 22' 50" N.; long. 135° 38' 30" E., 544 to 545 fathoms, 

 brown mud, small stones, bottom temperature 38.7°, 3 specimens; 

 station 4977, off eastern Japan, lat. 33° 23' N. ; long. 135° 37' 40" E., 

 544 fathoms, brown mud, fine sand, bottom temperature 38.9°, 1 

 specimen; station 4980, off eastern Japan, lat. 34° 9' N.; long. 137° 

 55' E., 507 fathoms, brown mud, fine sand, foraminifera, bottom 

 temperature 39°, 6 specimens; station 5082, off Omai Saki, Japan, 

 lat. 34° 5' N.; long. 137° 59' E., 662 fathoms, green mud, fine sand, 

 globigerina, bottom temperature 37.7°, 14 specimens; station 5083, 

 off Omai Saki, Japan, lat. 34° 4' 20" N.; long. 137° 57' 30" E., 624 

 fathoms, fine gray sand, globigerina, bottom temperature 38.1°, 20 

 specimens ; station 5084, off Omai Saki, Japan, lat. 34° N. ; long. 1 37° 49' 

 40" E., 918 fathoms, green mud, fine sand, globigerina, bottom tem- 

 perature 36.8°, 6 specimens; station 5092, Uraga Strait, lat. 35° 4' 

 50" N.; long. 139° 38' 18" E., 70 fathoms, coarse black sand, bottom 

 temperature 56.3°, 7 specimens. Bathymetrical range, 70 to 1,588 

 fathoms. Temperature range, 56.3° to 35.3°. One hundred and 

 eighty-two specimens. 



This is a fine series of this cosmopolitan species, already known 

 from many of the deeper parts of the sea, but not previously recorded 

 from the North Pacific. The specimens range in disk diameter from 

 6.5 to 35 mm., and show considerable diversity of form and structure. 

 The largest specimen is circular and very flat, the vertical diameter 

 of the disk being only 7.5 mm., or 21 per cent of the horizontal, while 

 another specimen, 30 mm. in diameter, is pentagonal and 10 mm. 

 thick, the vertical diameter therefore being 33 per cent of the hori- 

 zontal. The various differences noted are not very important nor 

 are they sufficiently constant to be of systematic use. But this 

 species would certainly prove an excellent subject for careful com- 

 parative study of variation in widely separated geographical areas. 

 The bathymetrical range is no less remarkable than the geographical. 



