70 CRABS OF THE FAMILY INACHJDM—M. J. BATHBVN. vol.xvii. 



There is notlnng- in tlie description or fignre of P. Jordi'i Spence 

 Bate to indicate tliat it differs from P. gracilis. It is said t» range sontli- 

 ward to San Francisco. 



This species differs from P. qnadridens in its greater proportionate 

 width at tlie hepatic regions. In /'. quadridohs the carapace is obvionsly 

 trianguhir, being mnch wider posteriorly than anteriorly, while in P. 

 gracilis the carapace is very little wider at the branchial regions than 

 at the hepatic. The anterior lateral expansion has its posterior lobe 

 produced much further forward than in P. qnadridens; its outer or pos- 

 terior margin is very convex, whih^ in P. quadridensit is concave except 

 near the end of the lobe. The pra-orbital lobes are wider and the orbital 

 sinus narrower in P. r/r«c?7/s than in P. qnadridens. In P. gracilis the 

 four ga.stric tubercles (the anterior one is obsolete in old specimens) 

 form a Latin cross; in P. quadrid ens they form a rectangle. The ambu- 

 latory legs are more slender in P. qnadridens. 



Localities. 

 Alaska; William H. Dall: 



Cliicliag()fi'lIarl)or, Attu, 5 to 7 fa.tb., gravel, sand (147r>fi). 



Kyska Harbor, in pass, 10 fnth. (UTSil). 



Nazau Bay, Atka, low water (147^7). 



Offlniagiia Tinnacle, Captain's Bay, Ilualaskn. S to 20 fath. (12538). 



Aniaknak Island, sbores (13131). 



Belkoffsky Bay, 15 to 25 fath. (14751). 



Popoff Strait, Shiiniagins, (5 fatli. (14753). 



CliirikolY Island, beach (15375). 



Middleton Island, west side, 10 to 12 fath., gravel, stones (14758). 



Port Mnlgravt% Yakntat Bay, to 40 fath. (14703). 



Litiiya Bay, to 9 fath. (147(54). 

 Alaska; other collectors: 



Unalaska; H. Applegate (12050). 



Kadiak; W. J. Fisher (5747); U. 8. Fish Commission (15571). 



Sitka; Commander L. A. Beardslce, C. S. N. (3171); F. Biscboff (2178). 



Ward Cove, Revilla, (iigedo Island; Dr. T. H. Streets, U. S. N. f 14761). 



Alert Bay, Cormorant Island, beach; Dr. W. H. Jones, U. S. N. (5815). 



British Columbia: 



Tledoo Village, near Susk, laortbwest coast ol' (Irabani Island, Qneen Char- 

 lotte group; James G. Swan (6611). 



Barclay Sound; IT S. Fisb Commission (15570). 



Victoria; Dr. C. F. Newcombe (15795). 

 Washington : 



Straits of Fuca (3400); D. S. Jordan (3077). 



Neah Bay; J. G. Swan (2396, 5771). 



Port Angeles; U. S. Fisb Commission (18140). 



Port Townsend; U. S. Fish Commission (16033). 



Port Ludlow; S. Bailey (14762); W. II. Dall (14755). 



Puget Sound; I). S. Jordan (3097). 



Port Orchard; O. B. Johnson (14967). 



