2 4 I 



dorsal surface and borders of the ossicles of the IBr series and lower 

 brachials smooth ; synarthrial and articular tubercles more or less prominent, 

 especially in large specimens, g'iving the arm bases a rugged appearance ; 

 arms from 225 mm. to 230 mm. in length 



c 1 more slender ; synarthrial and articular tubercles moderately developed ; 

 P 6 as long as P x , the intermediate pinnules longer (Bering Sea and 

 the westernmost Aleutian Islands to the G.u 1 f of Alaska, 

 and southward to Monterey Bay, California; yy — 1911 



Met r es) asperrima 



c 3 stouter; synarthrial and articular tubercles strongly developed; Pj, P 3 

 and P., of equal length ; P t slightly, P. much shorter (eastern coast 

 of Japan, from Yezo Strait southward to Li n schoten 

 Strait, between Shikoku and Hondo; 959 [? 540] to 1056 



Metres) laodice 



\r third syzygy rarely between the i4 th and 15" 1 brachials, usually between 

 the 15" 1 and ió lh or ió th and i/ 1 ' 1 ; borders of the ossicles of the IBr series 

 and lower brachials prominently spinous, and a greater or lesser development 

 of spines on their dorsal surface, particularly in the lateral portions ; lower 

 segments of the proximal pinnules strongly carinate, the carinate processes 

 spinous; synarthrial and articular tubercles undeveloped ; arms from 140 mm. 

 to 175 mm. long (eastern coast of Japan, from Sendai south- 

 ward to Saga mi Bay; 126 — 606 Metres) mariae 



3." Third syzygy between the i6 th and iy th brachials 



b 1 small, the arm being not over 125 mm., and usually not over 100 mm. 

 in length ; ossicles of the IBr series and first two brachials with finely 

 spinous borders, and with a single, rarely. more, prominent spine near the 

 outer borders, more rarely also with a few spines scattered over the dorsal 

 surface (from southern California southward to Panama Bay; 



102 — 711 Metres) tanneri 



b 3 larger, the arms being usually about 150 mm. long, and often longer 

 c 1 ossicles of the IBr series and lower brachials entirely devoid of spines 

 on the dorsal surface, and without spinous borders 



d 1 proximal. pinnules not swollen basally, P x and P^ being extremely 

 slender throughout their entire length, their basal segments with the 

 distal angles deeply truncated so that the dorsal border is narrowed 

 to a slightly rounded 'point usually crowned with a few spinelets 

 (from south eastern Alaska southward t o Panama; 11 — 



— 1407 Metres) perphxa 



d 2 Pj to P 4 distinctly swollen in the first five or six segments, noticeably 

 more slender beyond ; basal segments with their distal angles but 

 slightly truncated, so that the distal border is relatively long and 



SIBQGA-EXPED1TIE XU[i. 31 



