1921 ] Schmitt: The Marine Decapod Crustacea of California 283 



Similarly, more than half of the twenty-seven "north and south" 



species, fourteen (52%), also find their northern limits along the 



Alaska coast from the Aleutians southward; none reach the Bering 



Sea, the above nine forms ranging northward being the only (5%) 



California species recorded so far north; of the other thirteen (48%) 



north and south forms, seven, Crago nigricauda, Callianassa longi- 



mana, Petrolisthes cinctipes, P. eriomerus* Epialtus productus, 



Cancer antennarius, Uca musica, reach British Columbia ; three, 



Spirontocaris snyderi, Portunus xantusii, Scleroplax granulata, reach 



Puget Sound; one, Munidopsis quadrata, the coast of Washington; 



and two, Emerita analoga, Pachygrapsus crassipes, only go as far as 



the Oregon coast. The fourteen species reaching the Alaska coast but 



not found north of the Aleutians are : 



Pasiphaea pacifica Cancer magister 



Upogebia pugettensis Cancer gracilis 



Pagurus granosimanus Cancer oregonensis* 



Pachycheles rudis* Lophopanopeus bellus 



Mimulus foliatus Pinnixa occidentals 



Cancer productus Hemigrapsus nudus 



Cancer gibbosulus Hemigrapsus oregonensis 



The southern limits of eighteen (67%) of the twenty-seven north 

 and south species are found along the Lower California coast either 

 at Magdalena Bay or at points intermediate between it and Todos 

 Santos Bay ; only nine (33% ) range south of Magdalena Bay ; six, Pasi- 

 phaea pacifica, Petrolisthes cinctipes, Pachygrapsus crassipes, Hemi- 

 grapsus nudus, H. oregonensis, Uca musica, into the Gulf of Califor- 

 nia ; one, Mimulus foliatus, to Mazatlan ; one, Munidopsis quadrata, in 

 deep water to off the Tres Marias Islands, Mexico ; and one, Portunus 

 xantusii, to Chile. The eighteen north and south species not recorded 

 south of Magdalena Bay are : 



Spirontocaris snyderi Cancer productus 



Crago nigricauda Cancer antennarius 



Upogebia pugettensis Cancer gibbosulus 



Callianassa longimana Cancer magister 



Pagurus granosimanus Cancer gracilis 



Emerita analoga Cancer oregonensis* 



Pachycheles rudis* Lophopanopeus bellus 



Petrolisthes eriomerus* Pinnixa occidentals 



Epialtus productus Scleroplax granulata 



Of the fifty-three species ranging southward from California, 

 twenty-three (43%) have not been recorded south of the Coronados- 

 Magclalena Bay stretch, while thirty (57%) run farther south; six- 

 teen, Palaemon ritteri,f Urocaris infraspinis,f Periclimenes tenuipes,f 



