THE FOSSIL STAL.K-EYED CRUSTACEA 65 



Range of Recent specimens. — From Unalaska to Magdalena Bay, 

 Lower California. 



CANCER GRACILIS Dana 



Cancer gracilis Dana, Proc. Acad. Nat. Sci. Philadelphia, vol. 6, 1S52, 

 p. 73.— ScHMiTT, Univ. California Publ. Zool., vol. 23, 1921, p. 232, 

 pi. 35, fig. 2, and synonymy. — T. S. Oldboyd, Proc. U. S. Nat. Mus., vol. 

 65, art. 22, 1924, p. 23. 



Occurrence. — California ; Pleistocene series : 



Rincon del Potrero, Santa Monica; seven movable and six im- 

 movable fingers; Cat. No. 353382, U.S.N.M. 



Nob Hill (lumber yard), northeast of San Pedro; Lower San 

 Pedro formation; 2 movable fingers; Cat. No. 353384, U. S. N. M. 



Deadman Island, southeast of San Pedro; three movable and one 

 immovable finger. 



Spanish Bight, San Diego Bay; four movable and five immovable 

 fingers; Cat. No. 353383, U.S.N.M. San Diego Society of Natural 

 History; two movable and one immovable finger. 



Range of Recent specimens. — From Kasaan Bay, Prince of Wales 

 Island, Alaska, to Playa Maria Bay, Lower California. 



Genus BRANCHIOLAMBRUS Rathbun 



Branchiolamhriis Rathbun, Proc. U. S. Nat. Mus., vol. 35, 1908, p. 344 ; 

 type, B. alt us Rathbuu. 



Carapace rhomboidal, its anterior two-thirds subtriangular ; orbits 

 directed outward. Branchial regions nearly touching on median 

 line. Front and antero-lateral margins dentate; postero-lateral 

 margin a sinuous line, below which the surface is steeply inclined. 



Miocene. 



BRANCHIOLAMBRUS ALTUS Rathbun 

 Plate 4, figs. 2 and 3 



Branchiolambrus alius Rathbun, Proc. U. S. Nat. Mus., vol. 35, 1908, p. 

 345, pi. 47, figs. 2 and 3 ; type-locality. Wagon Wheel Mountain, south- 

 east quarter, section 36, township 25 south, range 18 east. Devil's 

 Den District, about 36 miles south of Coalinga, Kern County, Cali- 

 fornia ; lower Miocene series, immediately below Vaqueros beds ; one 

 carapace, Cat. No. 165478, U.S.N.M. 



Description. — Carapace rhomboidal (pi. 4, fig. 2), front subtri- 

 angular, antero-lateral margin slightly arcuate, postero-lateral mar- 

 gin equally long, sinuous; below it a vertically oblique facet. 

 Carapace very convex at its widest part (pi. 4, fig. 3), branchial 

 regions nearly touching each other, an acute, conical tubercle at 

 inner angle of each. Surface crisply granulate. Cervical suture 

 shallow anteriorly, deep and narrow posteriorly. Cardiac region 



3020—26 6 



