Vol. 4 1 Weavt r. Palaeontology of the Marline: droit p. 



123 



CRUSTACEA. 



cancer (Lin.) Leach. 



Cancer? sp. 



Pl. 13, Fig. 11. 



All that remains of the specimen is a portion of the carapace, 

 and from this it is at present impossible to determine the genus 

 and species more accurately than to show that it closely resem- 

 bles the genus Cam < r. 



Dimensions: — The maximum breadth is L'f) mm., and the 

 length is L!l nun. 



Occurrence: — About four miles south of Martinez and east 

 of the road to Walnut Creek. It occurs in the upper beds. 



University of California. 



February, 1905. 



