THE FOSSIL STALK-EYED CRUSTACEA 59 



Range of Recent specimens. — From Monterey Bay, California, 

 to Guadalupe Island, Mexico. 



Family CANCRIDAE Alcock 



Carapace broadly oval, front with several teeth, one of which is 

 median. Antennules fold back longitudinally. Antennal fiagella 

 usually short and more or less hairy. Third maxillipeds overlapping 

 endostome. 



Genus CANCER Linnaeus 



Cancer Linnae^us, Syst. Nat., ed. 10, vol. 1, 1758, p. 625; tyije, C. pagurtis 

 Linnaeus. 



Carapace transverse, subelliptical, often indistinctly areolated; 

 front narrow, cut into live teeth or lobes. Orbits small, with two fis- 

 sures in both upper and lower margins. Antennal flagellum ex- 

 cluded from orbit. Palms longitudinally ridged outside; fingers 

 broad at attachment, tapering to a point ; dactyli thick above, upper 

 surface graduall}' rounding into outer surface, upper edge sometimes 

 cristate. 



Eocene; Recent. 



CANCER GABBI, new species 

 Plate 16, figs. 7 and 8 



Among the specimens borrowed from the Academy of Natural 

 Sciences, Philadelphia, under the name of CaUianassa stinipsonii 

 Gabb, are two which are portions of right chelipeds of a Cancer. 

 They were labeled by Gabb, " Martinez or Clayton '" and are Eocene. 



The more complete though smaller specimen (holotype) shows 

 the outer face of the palm and a portion of the outer face of the 

 wrist against which it is flexed (pi. 16, fig. 7). The larger specimen 

 (paratype) is more fully free from the matrix and comprises the 

 distal portion of a palm, both sides of which are exposed (pi. 16. 

 fig. 8). _ 



Description of palm. — Lower margin more arcuate than the upper, 

 the deepest part of the curve being nearer the distal than the prox- 

 imal end. Base of fixed finger horizontal. Greater part of upper 

 margin a shallow arch, the distal end is separately ascending. Prox- 

 imal margin very oblique. Outer layer of shell lacking; exposed 

 surface covered chiefly with raised reticulating lines; four smooth 

 longitudinal stripes are visible, one on upper surface, one immedi- 

 ately above lower margin, both wide, a narrower stripe at middle of 

 outer surface and a very narrow one a little below the middle. The 

 bases of both fingers are wide so that the intervening gape is rela- 

 tively narrow; the movable is a little wider than the immovable, 

 finder. 



