114 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



California: Llajas Canyon, Simi Valley; Santa Susana Shales, 

 the basal member of the Meganos Group, Eocene series; left palm, 

 inside view. 



Relation. — This species may be recognized by the strong tooth at 

 the upper proximal end of the manus and the tooth in the gape being 

 adjacent to the dactylus rather than to the fixed finger as in C. knapp- 

 tonensis. 



CALLIANASSA CLALLAMENSIS Withers 



Plate 26, figs. 6-12 



Callianassa clallamensis Withers, Ann. Mag. Nat. Hist., ser. 9, vol. 14 

 1924, p. 122, pi. 4, figs. 4-7 ; type-locality, Clallam Bay, south' shore of 

 Strait of Juan de Fuca ; Blakeley formation, upper Oligoceue; Brit. 

 Mus., Cat. Nos. In. 23789-In. 23797. 



Description. — Shape of manus squarish, the upper and lower mar- 

 gins both inclined slightly down at the distal end. Outer surface 

 very convex, especially at the upper third. Upper and lower margins 

 rimmed, entire, with submarginal punctae, of which six are visible 

 along the upj^er margin and seven along the lower. On the lower 

 distal quarter a group of 14 unequal tubercles besides a row of three 

 above the submarginal punctae (pi. 26, fig. 11). On the upper dis- 

 tal portion a small group of tubercles near the hollow above the artic- 

 ulation of the dactylus and three or four tubercles at a little greater 

 distance. Besides, the whole surface shows evidence of a pavement 

 of oblong tubercles for the most part belonging to a lower layer of 

 shell, but projecting slightly in the lower proximal portion. The 

 inner side (pi. 26, fig. 10) has a similar pavement, which is evident 

 on the surface in two places, near the upper and lower margins both 

 distad to the middle. There are a few (three or four) round tubercles 

 in the upper distal corner behind the much swollen articulation with 

 the dactylus, and one just below the upper margin in the same neigh- 

 borhood. In the lower distal corner there is a large tubercle at base 

 of finger and a smaller one further back above the margin. Of sub- 

 marginal punctae there is a row of 22 above the lower margin, the 

 distal six or seven being less crowded ; the row along the' upper 

 margin shows only about six or seven besides those punctae in the 

 tubercles already mentioned. 



The Twin specimens (pi. 26, figs. 6-9) show that the upper 

 proximal corner of the manus is almost right-angled. The specimens 

 are all smaller than the one above described and the tubercles on the 

 lower distal quarter of the outer face run fewer and average smaller. 

 One tubercle or short spine is at the outer edge of the gape close to 

 the dactylus (figs. 7 and 9). On the inner surface there is a row of 

 from four to six tubercles a little below the articulation with the 

 dactylus. There is always present on the same surface the small 



