156 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



predominantly males; the few large females, however, were ovigerous. 

 The smaller specimens were evenly divided as to sex, the females without 

 ova. 



After discussing the status of Chionoecetes bairdi in the Puget Sound 

 region, Slipp (1952, p. 237) concludes: "One may surmise that the 

 general feeling among resident zoologists in the northwest that the 

 named forms of Chionoecetes are not specifically distinct is a result of 

 the predominance of specimens of the single species C. bairdi in the 

 material collected by ordinary dredging and trawling operations. Except 

 as a result of special collecting at levels well below those of ordinary 

 fishing operations, specimens of C. tanneri and C. angulatus are 

 evidently seldom encountered and are thus unfamiliar to those examining 

 the catches. This would imply that C. bairdi is probably the dominant 

 form not only in the inland passage but also on the continental shelf 

 seaward of the outer coasts." 



Chionoecetes bairdi, here treated as a full species, might on zoo- 

 geographical grounds be considered a subspecies of C. opilio, which 

 occurs in the Bering Sea and is represented in the western Pacific by 

 the subspecies C. o. elongatus, with which C. bairdi is strictly analogous. 

 However, certain differences apparent in the pleopods of the limited 

 number of specimens examined will have to be reconciled as due to 

 growth, or themselves subject to geographical variation, before this 

 course can be adopted. 



Chionoecetes tanneri Rathbun 

 Plate I, Fig. 8; Plate 16, Fig. 2 



Chionoecetes tanneri Rathbun, 1893a, p. 76, pi. 4, figs. 1-4 (part: the 

 southern specimens; northern specimens withdrawn as C. angulatus 

 Rathbun, 1924a); 1898, p. 573; 1904, p. 174; 1923b, p. 634; 

 1925, p. 243, pis. 88, 89, 234. Holmes, 1900, p. 40. Weymouth, 

 1910, p. 35 (not pi. 7, fig. 19). Schmitt, 1921, p. 210, text-fig. 131. 

 Goodwin, 1952a, p. 179, text-fig. 11; 1952b, p. 395. Not Way, 

 1917, p. 372, fig. 28. Not Queen, 1930, p. 399, fig. 7. Probably 

 not Newcombe, 1893, p. 19; 1898, p. 76. 

 Type: Male holotype, U.S.N.M. No. 15860, length 119 mm on 



median line, width 130 mm. 



Type locality: Gulf of the Farallones, California, 29 fathoms, 

 Albatross station 3100. 



