30 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



Occurrence. — California : Deadman Island, near San Pedro, Los 

 Angeles County; Pliocene series; one specimen, male, without cheli- 

 peds, holotype, in Stanford I^niversity. 



Relation. — This species is, so far as can be seen without a knowl- 

 edge of the chelipeds, most nearly related to the Recent U. moni- 

 Ufera'^ of the Gulf of California; they both have an uneven cara- 

 pace, a sinuous anterior, or supraorbital, margin and a coarsely 

 turreted infraorbital margin; U. monilifera has a more transverse 

 anterior margin, a broader blade and more constricted neck to the 

 rostrum, a smoother lateral margin, and less inflated meropodites. 



UCA HAMLINI, new species 



Plate 8, fig. 1 



Description. — Upper and loAver margins of palm subparallel ex- 

 cept toward the carpus, a portion of which is to be seen adjacent to 

 upper half of manus (pi. 8, fig. 1) ; distal end of manus oblique. 

 Fingers broad, meeting at base, gradually diminishing to the ex- 

 tremities, dactylus arched so as to form a Avide gape between the 

 fingers when flexed. Very little of the outer layer of shell remains. 

 The manus is swollen at the articulation with the dactjdus. The 

 lower margin of propodus, including the finger, has a narrow raised 

 rim; above the rim a roAv of fine punctae. There is a blunt, ob- 

 liquely longitudinal ridge on base of finger, perhaps accidental. 

 The finger curves slightly upward toward the end; at the middle 

 of the prehensile edge a broad, triangular, blunt-pointed tooth, with 

 a long, gradual proximal slope, and a short distal margin normal 

 to the finger. The dactylus tapers to a slender, blunt tip, its pre- 

 hensile edge is crenulate near the tip, at the proximal end it forms 

 a broad shallow crenated lobe Avith six thick crenae. 



Measurements. — Holotype, length of chela through middle of 

 palm to end of dactylus 38.3 mm., to end of propodal finger 36 mm., 

 length of manus on upper margin 12.8 mm., through the middle 18 

 mm., greatest width of manus near proximal end 17 mm., length 

 of dactylus measured from upper point of union with palm 24 mm. 

 The palm has an oblique fracture across the middle which may 

 have shortened the true length of the article. 



Occurrence. — California: Third Street tunnel, Los Angeles; Plio- 

 cene series; one right chela of a male, holotype (Cat. No. 353372, 

 U.S.N.M.). 



Relation. — In the comparative length of palm and fingers, this 

 species is related to several Recent short-fingered species of the 

 Pacific coast of America, such as V . tnacrodactylus ^ (Mexico to 



8 Rathbun, Bull. U. S. Nat. Mus., No. 97, 1918. p. 380, pi. 132. 



^ Gclasimus macrodactylus Milne Edwards and Lucas, in d'Orbigny's Voy. dans. TAm^r. 

 Mt-rid., vol. 6, 1843, Crust., p. 27 ; vol. 9, atlas, 1847, pi. 11, fig. 3. 



