102 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



lipeds approximated at base. Abdomen with paired appenda<^es 

 other than tlie uropods on the first two segments in the male and the 

 first segment in the female. 

 Miocene ( ? ) ; llecent. 



PAGURISTES. species 



Plate 24, fig. 3 



Description. — The specimen as Avell as its encasing rock is so crum- 

 bly that no more can be uncovered without destroying it. Only the 

 form of the fingers is seen and in the case of the propodal finger 

 nothing but the impression. The fingers meet along their pre- 

 hensile edges which are dentate and longitudinal or nearly so. The 

 outer part of the proximal third of each finger is broken away ; the 

 distal two-thirds gradually diminishes, with the outer margins 

 slightly convex. The propodal finger appears triangular in cross- 

 section; its lower surface is granulate along the inner and outer 

 edges. The distance across the fingers at the proximal third is 

 10.6 mm. A fragment of the inner surface of the palm bears several ; 

 tubercles. 



Occurrence. — California: Santa Rosa quadrangle, Sonoma County; 

 1 mile south of Mountain School and li/^ miles southwest of Peta- 

 luma Reservoir, on right bank of creek bed ; Miocene (?) series, 

 fresh and brackish water zone; one specimen, showing part of the 

 right cheliped. 



E elation. — Approaches P. turgidus (Stimpson)** a Recent species 

 on the coast from British Columbia to San Diego and extending 

 down to 254 fathoms. The fingers of the fossil are more nearly 

 equal. 



Genus DARDANUS Paulson 



Dardatms Paxh-son, Invest. Crabs Red Sea, Kiev, 1875, p. 90; type, D. 

 hellerii Paulson. 



Chelipeds with few exceptions dissimilar and unequal, the left 

 being much the larger ; finger tips corneous, blackened and somewhat 

 spooned, especially those of smaller hand. Fourth pair of legs sub- 

 chelate. Outer maxillipeds approximated at base. No paired ap- 

 pendages on anterior abdominal segments of either sex. 



Eocene; Pleistocene; Recent. 



DARDANUS SUBAEQUALIS. new species 

 Plate 24, figs. 1 and 2 



Description. — Chelae similar and subequal. In the left or major 

 chela (pi. 24, fig. 2) the palm is only slightly higher than in the 

 right (pi. 24, fig. 1), and seemingly shorter, the fingers are longer 



** Schmitt, Univ. California Tubl. Zool.. vol. 23, 1921, p. 123, pi. 18, figs. 1 and 8. 



