THE FOSSIL, STALK-EYED CRUSTACEA 61 



fifth, sixth, seventh, and eighth teeth have each a small horny point 

 at their anterior angle. 



Additional occurrence. — Two incomplete left palms from the same 

 region as the type-locality of C. flssus are placed here tentatively. 

 They are from the south central part of the southeast quarter of 

 section 24, Coalinga Quadrangle, California; Etchegoin formation^ 

 Pliocene series. 



Measurements of larger palm. — Height 24 mm., length on upper 

 margin 19.8 mm., thickness 15.3 mm. 



DescHption of pcdm. — Unusually short and liigh, much SAvollen; 

 upper edge blunt, without serrations; outer surface showing traces 

 of five longitudinal ridges (pi. 16, fig. 5), as in other species of 

 Cancer. Fingers absent, but the fixed finger is apparently much 

 deflexed ; its height at base, measured from lower margin of palm is 

 not more than two-fifths the height of the cavity in which the 

 dactylus once fitted (pi. 16, fig. 6). These two characters distinguish 

 the palm from that of any other Cancer. 



CANCER URBANUS Rathbun 



Plate 15 ; plate 16, fig. 1 



Cancer urbanus Rathbun, Proc. U. S. Nat. Mus., vol. 53, 1917, p. 451, 

 pi. 59 ; type-locality, Los Augeles, California ; from foundation of 

 large building ; Pliocene series ; carapace embedded in blue clay, Cat. 

 No. 324300, U.S.N.M. 



Deso'lption. — Surface of carapace (pi. 15) about equally convex 

 from side to side and from front to back; uneven, closely granulate, 

 granules larger and more prominent on the most elevated portions ; 

 interregional depressions deep. Antero-lateral teeth 9, including the 

 tooth at lateral angle of carapace and at outer angle of orbit; teeth 

 acute, margins straight, anterior margin usually considerably shorter 

 than posterior margin; margins of seventh or widest tooth nearly 

 equal. Furrows leading back from sinuses of anterior margin deep. 



Additional occurrence. — Santa Monica, California, in Rustic Can- 

 yon; Pliocene series; portion of right cheliped showing dorsal view 

 of carpus and manus; Cat. No. 353394, U.S.N.M. The specimen is 

 tentatively linked up with this species. A specimen showing both 

 carapace and cheliped is necessary to prove their specific identity. 



Meusu7'enients. — Estimated width of carapace (holotype) meas- 

 ured between antero-lateral sinuses 48 mm., length of carapace about 

 34 mm. Length of carpus (Santa Monica) 20.7 mm., superior length 

 of manus 20.4 mm. 



Upper surface of carpus (pi. 16, fig. 1) bounded by a band of 

 coarse granules; in the middle two high granulated tubercles are 

 placed transversely and from each an irregular band of granules 



