274 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



California, males were under 14 mm in length. These will be treated as 

 distinct populations in the account of growth and development to follow: 



Among southern California-Lower California specimens, regarded as 

 typical, males from 7.0 to 21.2 mm and females from 6.9 to 20.5 mm, 

 with young to as small as 4.8 mm, were found. Ovigerous females range 

 from 9.5 to 20.5 mm. There is considerable difference as to the size at 

 which the male chela ceases to resemble the female and becomes high, 

 compressed, with fingers agape. In general, it seems to be attained between 

 10.3 and 15 mm, some specimens of 11 mm exhibiting this feature while 

 others considerably larger (Pelia clausa of Rathbun) do not. 



Gulf of California males range from 7.5 to 13.8 mm, females from 

 7.0 to 14.7 mm, the 7.0 mm specimen being ovigerous. Young to 3.5 

 mm are present, with sex clearly determinable in females of 4.7 and 5.0 

 mm. A 13.8 mm male had undeveloped chelae, while one of 13.7 mm 

 had the chelae fully matured. Individuals with rostral horns diverging, 

 usually old males, but in one case a female, were observed more fre- 

 quently in the Gulf than elsewhere. It is remarkable that in the Gulf 

 there occur ovigerous females smaller than the first recognizable develop- 

 ing females in the southern California population. 



Breeding: Ovigerous females were encountered by Velero III col- 

 lectors in the Gulf of California in January, off the Mexican mainland 

 in March, by C. L. Hubbs and party in Lower California in February, 

 and by Hancock Foundation collectors in southern California waters in 

 January, and again in June, July, and August. 



Pelia pacifica A. Milne Edwards 

 Plate Q, Figs. 2-4; Plate 31, Fig. 3 



Pelia pacifica A. Milne Edwards, 1875, p. 73, pi. 16, figs. 3-3c. Holmes, 



1900, p. 36 (part). Rathbun, 1904, p. 174 (part); 1907, p. 72 



(part) ; 1910, p. 572 (part) ; 1925, p. 283, pi. 98, fig. 1 ; pi. 99, 



fig. 1. Crane, 1947, p. 71. Not P. pacifica Rathbun, 1893a, p. 90; 



1898, p. 573. 



Type: Male holotype, length 9 mm, width 7 mm, in Paris Museum; 



obtained through S. I. Smith, Yale University, according to A. Milne 



Edwards. 



Type locality: Bay of Panama, F. H. Bradley, collector. 

 Localities subsequently reported, with collectors: Mexico: Man- 

 zanillo, Colima, C. R. Orcutt (Rathbun, 1925) ; Acapulco, Guerrero, 

 Zaca (Crane). Not Magdalena Bay, Lower California, Albatross 



