THE FOSSIL STALK-EYED CRUSTACEA 63 



Point Loma, "coal mine," ocean shore of Point; right movable 

 finger and right imlnovable finger of much larger specimen; Cat. 

 No. 8258, U.S.N.M.' 



LOWER CALIFORNIA, MEXICO 



San Quentin Bay, lava beds ; one movable finger ; Cat. No. 353392, 

 U.S.N.M. 



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

 Lower California. 



CANCER BRANNERI.21 new species 



Plate 16, fig. 4 



Cancer gibhosulus Rathbun, Proc. U. S. Nat. Mus., vol. 21, 1898, p. 581 

 (part; Amerieau specimens), not C. gibhosulus (de Haan). — Schmitt, 

 Univ. California Publ. Zool., vol. 23, 1921, p. 226, pi. 36, fig. 7, and 

 synonymy (part; American specimens). 



Holotyye. — Male, Eecent, San Francisco; D. S. Jordan, collector; 

 1880; Cat. No. 3092, U.S.N.M. 



I The acquisition of large and mature Recent specimens of the 

 Japanese Cancer gibhosulus makes it possible to demonstrate that 

 the American form is specifically distinct. The following are the 

 chief differences : The carapace of G. hranner^ is a little wider in 

 proportion to its length, the postero-lateral margins are more con- 

 cave, the principal (anterior) of the two postero-lateral denticles 

 being sharp-pointed (spiniform) instead of blunt; the antero-lateral 

 teeth always all sharp-[)ointed, although individuals vary in width and 

 sharpness, w^hereas in gibhosulus^ the first six teeth incline to be 

 blimt; the outer orbital tooth is narrower than in gibhosulus ,' gran- 

 ules of dorsal surface fewer, larger and more scabrous, areoles lower 

 and flatter, especially the protogastric pair and that at inner angles 

 of branchial region. Sixth abdominal somite narrower, the proxi- 

 mal width exceeding the length but little, whereas in gibhosulus the 

 width is one and one-half times the length; this character is much 

 less marked in small specimens. The dactylus of the cheliped (pi. 

 16, fig. 4) has on its outer face two strong carinae the upper of 

 which is spinous, and between them a tuberculate carina on the 

 proximal half only; in gibhosulus the intermediate carina is full 

 length and stronger than the lower, Avhich becomes weaker proxi- 

 mally, as does the upper carina which is spinulous but without the 

 single row of strong spines seen in branneri. 



Occurrence of fossils. — California ; Pleistocene series : 

 San Pedro; two movable and one immovable finger; Cat. No. 

 353381, U.S.N.M. 



-1 For the late Dr. John Casper Branner, geologist and president of Stanford University. 



