19 21 ] Schmitt: The Marine Decapod Crustacea of California 293 



species known or reported from the region investigated were found, 

 all shore collecting, including seine hauls, was unfortunately confined 

 to the middle bay. No doubt many, if not all the forms so taken are 

 to be found along the ocean beaches outside. At least one of the 

 dredged species, Pamdalus danae, is known to be plentiful outside 

 though taken by us only in the bay. Moreover, nearly a fourth, eleven 

 (24%), of the species were taken but once during the survey: 



Crago resima Acavtlwlithodes hispidus 



Crago alba Bandallia ornata 



Crago communis Oregonia gracilis 



Pagurus samuelis Pinnixa littoralis 



Pylopagurus minimus Scleroplax granulata 

 Holopagurus pilosus 



Those taken at more than ten stations are in no greater number, 

 comprising, likewise, less than a fourth (24%) of the species. Only 

 the first five of these were obtained from about one fourth of the total 

 number of dredging stations. Arranged in order of the number of 

 stations, dredging and hydrographic, at which each was taken, they 

 are as follows : „ , 



Number of stations 



D. H. Total 



Crago franciscorum 94 137 231 



Crago nigricauda 103 69 172 



Spirontocaris cristata 35 28 63 



Cancer magister 57 1 58 



Crago stylirostris 40 3 43 



Hemigrapsus orcgonensis 19 1 20 



Crago nigromaculata 19 .... 19 



Callianassa longimana 16 2 18 



Cancer productus 16 .... 16 



Cancer gracilis 14 .... 14 



Pagurus liirsutiusculus 13 .... 13 



However, with respect to their local distribution the survey species 

 belong to three groups: (1) those taken only outside; (2) those taken 

 only in the bay; and (3) those taken both in the bay and outside. 



1. The species taken only outside are sixteen (35%) in number, 

 as follows : 



Pandalus jordani Paguristes balceri 



Spirontocaris gracilis Holopagurus pilosus 



Crago alaslcensis elongata Pagurus ochotensis 



Crago communis Pylopagurus minimus 



Crago alba Acantholithodes hispidus 



Crago resima Bandallia ornata 



Crago spinosissima Oregonia gracilis 



Paguristes turgidus Pinnixa occidentalis 



