1921] Schmitt: The Marine Decapod Crustacea of California 281 
IV. DISTRIBUTION 
Geographical..—Of the one hundred and eighty-one marine deca- 
pods known to occur within the 100 fathom line off the coast of 
California, forty-two (23%) are found on the west coast of North 
America only within that area, fifty-nine (33%) range from Cali- 
fornia northward, fifty-three (29%) range southward, and twenty- 
seven (15%) range both north and south. 
The species confined to California waters on the North American 
coast are: 
Palaemonetes hiltonit Cyclodorippe plana 
Pontonia californiensis} Loxorhynchus grandis* 
Pandalus gurneyt Loxorhynchus crispatus* 
Hippolysmata californicay Cycloxanthops rugosus+ 
Spirontocaris affinis® Lophopanopeus frontalis} 
Spirontocaris lagunaey Lophopanopeus heathiv 
Spirontocaris franciscana Lophopanopeus leucomanus 
Spirontocaris carinata Lophopanopeus diegensis 
Spirontocaris picta Xanthias latimanus; 
Crangon barbara; Speocarcinus califormensisy 
Crangon equidactylus Pinnotheres nudus° 
Betaeus harfordi Pinnotheres holmesi° 
Betaeus longidactylus+ Fabia lowei+ 
Nectocrangon californiensis} Fabia canfieldi° 
Axiopsis spinulicauda? Parapinnixa affinist 
Callianassa affinisy Pinniza longipes 
Paguristes parvusy Pinnixa franciscana° 
Holopagurus pilosus Pinniaa hiatus} 
Pagurus samuelis Pinnixa weymouthi° 
Pachycheles holosericus Opisthopus transversus 
Petrolisthes rathbunae+ Grapsodius eximiusy 
Except Pagurus samuelis, all of the above are peculiar to Cali- 
fornia. 
More than one-half, thirty-three (56%), of the fifty-nine species 
ranging northward find their northern limits along the Alaska coast, 
1 As noted in the Introduction this discussion deals only with the littoral fauna. 
The forms which have been included and which possibly do not properly belong 
here are the seven cited as ‘‘pelagic’’ or ‘‘with a bathymetric range of more than _ 
500 fathoms,’’ (p. 285) all or in part. 
The species taken in connection with the Biological Survey of San Francisco 
Bay are printed in bold face type; those reported from the region covered by the 
survey but not taken during it are marked with an *; those found only north 
of Point Conception are indicated by a ©; and those found only south of that 
point on the west coast of America are marked with a j. The species lacking 
either of these last two signs naturally range both north and south of Point Con- 
ception. 
The northern limits of seven species are somewhat doubtful, but owing to the 
fact that they are so few in number (4%) and in order to avoid unnecessary 
