28 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



Measurements. — Holotype, length of upper margin of manus 

 17 mm., length of outer margin of manus (articulating condyle 

 broken) 16.8 mm., length of inner margin measured to tip of finger 

 19.3 mm., greatest width of outer surface 4.8 mm. Right merus, 

 Deadman Island, paratype, length on inner margin 11 mm. 



OccurreTice. — California: Pleistocene series: 



Xob Hill (lumber yard), northeast of San Pedro; lower San 

 Pedro formation; one left manus (Stanford University), one left 

 manus, one fragment of manus, one right merus (U.S.N.M., Cat. Xo. 

 353379) ; paratypes. 



Deadman Island southeast of San Pedro: one right merus, one 

 piece of a left manus ; paratypes. 



Signal Hill (or Los Cerritos), northeast of Long Beach; upper 

 San Pedro formation. Pleistocene series; one propodus of left 

 cheliped, holotype, in Stanford LTniversity. 



Relation. — These arms and hands are very near M. helUi (A. Milne 

 Edwards),^ a Recent species inhabiting both coasts of Lower Cali- 

 fornia and also the Ba}' of Panama in depths varying from 91^ to \ 

 71 fathoms. In hellii., however, the articles are slenderer, their mar- 

 ginal teeth fewer and thinner, and finely granulate on all sides 

 instead of in a transverse line. 



Genus HETEROCRYPTA Stimpscn 



Heterocrypta Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 1871, p. 

 102 [129]; type, H. granulata (Gibbes). — Rathbun, Bull. U. S. Nat. 

 Mus., No. 129, 1925, p. 554. 



Carapace broad, pentagonal, expanded so as to partially cover 

 legs and abdomen. A branchial ridge subparallel to antero-lateral 

 margin extends to gastric region. Palm very long, fingers short, 

 triangular in cross-section. 



Pleistocene; Recent. Not before found fossil. 



HETEROCRYPTA OCCIDENTALIS (Dana) 



Cryptopodia occidentalis Dana, Amer. Journ. Sci., ser. 2, vol. 18, 1854, p. 430, 



woodcut. 

 Heterocrypta occidentalis Rathbun, Bull. U. S. Nat. Mus., No. 129, 1925, 



p. 559, pis. 204 and 205, and synonymy. 



Occu7Ten^e. — California: Rincon del Potrero, Santa Monica; Pleis- 

 tocene series ; nine right movable, one immovable finger ; U. S. N. M., it 

 Cat. No. 353363. Specimens much worn. Outer edge of superior 

 triangular surface in most cases indistinct. 



Range of Recent specimens. — From the Farallones, California, to 

 Los Coronados Islands, Mexico. 



* Soletwlambrus bellii A. Milne Edwards, Crust. Reg. Mex., 1878, p. 163, pi. 29, figs. 

 6-6d. 



