ARNOLD — THE PALEONTOLOC; Y AND STRATIGRAPHY OF SAN PEDRO. 345 



SuiKironlcr M A I A C ( ) S T K A C A .' 



Order DECAl'ODA. 



Suborder BR AC in' T R A . 



Sublribe CANCROIDEA. 



Section CancrinL 



Genus Cancer Linnr. 



Carajiace transverse, suhelliptical, indistinctly aroohited; antero-lateral marpins regularly 

 arcuated and armed with ten teeth; iVoiit narrow, cut into five teeth or lobes; eye-peduncles short, orbits 

 small, with two fissures in both upper and lower margins; antennules longitudinal, or nearly so; basal 

 antennal joint somewhat enlarged and united with the front, thus excluding the short flagellum from 

 the orbit; merus of the maxillipeds distally truncated, and not produced at the antero-external angle; 

 chelipeds subequal, the hand generally costate on the outer surface. 



407. Cancer breweri Gabb. 



Cancer breweii Gabb, Pal. Cal., Vol. II, ]). i, I'l. 1, fig. i, 1S69. Cooi'ek, ytii Annual Rcpt. Cal. 

 St. Min., 1888, p. 227. 



" Hand shorter, more robust, and broader proportionall\' liian that of C. tnagisler Dana; 

 upper margin flattened and bordered by two well-defined ridges, each bearing about four tubercles; 

 outer surface marked by five nearly obsolete ridges minutely tuberculated; fingers shorter than in 

 C. magisler, the movable one more curved, and both with the denticles nearly obsolete' ' (Gabb). 



Dimensions. — Length of hand 82 mm. 



The above description is ;i copy of Gabb'.s orij»;inaI. .V well preserved hand 

 from the lower San Pedro series of Deachnan [shmd corresponds ahuo.st exactly witli 

 (Jabb's figure of his type. C. magistcr i.s the common large edible crab of the Cali- 

 fornia coast. 



Pleistocene. — San Pedro (Arnold). 



Pliocene. — Calleguas ranch, N'ciiUira County (Hrewer). 



' Divisions of this suborder snd Rennric description from "Synopsis of Oftllfornia Slalk-Eyed Crustacea." By S. J. Uoluiei. 

 Occajiioiinl Papers. Cal. Acad. Sci., No. VII, p. 47, 1900. 



, 14 , May 39, 1903. 



