272 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Lower California, Mexico: San Bartolome Bay and Magdalena Bay, 

 3 fathoms, W. J. Fisher? (Lockington, 1877c) ; west of Magdalena Bay, 

 36 fathoms, Albatross (Rathbun, 1893a, as Pelia, sp.) ; Magdalena Bay, 

 12 fathoms, Albatross (Rathbun, 1898, as Pelia pacifica), C. R. Orcutt 

 (Rathbun, 1925). 



Gulf of California, Mexico: off Adair Bay, 17 fathoms, Albatross 

 (Rathbun, 1893a, as Pelia pacifica). 



Atlantic analogue: None. 



Diagnosis: Carapace narrow, width from two-thirds to three- fourths 

 total length. Rostral horns with outer margins parallel or divergent, 

 length from one-third to one-fourth remainder of carapace. Basal an- 

 tennal article elongate; second movable article falling short of tip of 

 rostrum. Gape between fingers of adult male of moderate width, digital 

 tooth molariform. Male first pleopod slender, gradually narrowing to 

 tip, not bent below aperture; aperture normally closed. 



Description: Carapace pyriform, rounded, tumid, covered with 

 pubescence, but entirely devoid of spines. Median [gastric] region 

 rounded, smooth, much elevated, and furnished with a small rounded 

 tubercle at the summit ; branchial regions inflated ; cardiac region with 

 a small rounded elevation. Rostrum depressed, nearly one-half the length 

 of the carapace and bifurcated for about half its length, the horns nar- 

 row, divergent, and slightly upturned at the tip. No preorbital tooth ; 

 postorbital small. Anterolateral margin entire. Basal antennal [article] 

 considerably longer than wide and devoid of teeth with the exception of 

 the one at the anteroexternal angle, plainly visible from above ; tip of the 

 peduncle reaching just beyond the apex of the notch between the rostral 

 horns, not nearly reaching the tip of the rostrum as in Pelia pacifica; 

 flagellum rather long. Merus of the maxillipeds distally truncated. 



Chelipeds unarmed ; merus not nearly reaching the tip of the ros- 

 trum ; hand oblong, inflated, the edges obtuse and parallel ; fingers widely 

 gaping, a tubercle on the inner margin of the dactyl near the base. 



Ambulatory legs compressed, pubescent, the margins furnished with a 

 thick fringe of stiff setae ; dactyls sharply curved at their sharp, corneous 

 tips. (Holmes, from a male specimen of Lockington's from Magdalena 

 Bay) 



In the undeveloped males (the Pelia clausa form) the chelipeds are 

 weak as in the adult females, the chelae small, the palms tapering distally, 

 the fingers meeting except for a very slight gape in the basal third or 

 fourth. (Rathbun, 1925) 



