70 BULLETIN 138, UNITED STATE* NATIONAL MUSEUM 



cave, making a blunt angle with the outer surface; both inner and 

 outer ridges show a faint tuberculation. Fingers long and narrow, 

 'Suboval in section, prehensile edges armed with many small, unequal 

 teeth; fingers more widely separated in major than in minor chela 

 on account of the greater height of the hand, the fingers being of ap- 

 proximately the same width in both chelae. 



Ambulatory legs: The merus joints of the three ambulatory legs 

 are long and narrow, oval in cross-section. There is no trace of the 

 last pair of legs. 



Measurements. — Male lioloty])e, length of carapace on median line 

 31 mm., width at sinus in front of lateral spine 42.5 mm., fronto- 

 orbital width about 24 mm. The following measures are approxi- 

 mate : Length of carapace of female, No. 193, on median line 18.7 

 mm. ; width at sinus in front of lateral spine 25 mm. Width at same 

 sinus of male from Porter, H. Landes, collector, 33.6 mm. ; of speci- 

 men, N. Pac. 53, 33.2 mm.; of a male from same lot 47 mm., its 

 iengih 33.2 mm.; while a major manus, N. Pac. 211, belongs to a 

 considerably larger carapace than any preserved, having a maximum 

 height of 20 mm., thickness 14.3 mm. and a superior length of at 

 least 20 mm. 



Occurrence. — 



WASHINGTON 



In bluffs immediately north and south of Porter, Chehalis County; 

 Oligocene series; one female. 



Porter, Chehalis County; middle Oligocene series; two specimens. 



Shaly sandstone bluff on Chehalis River, below Porter; middle 

 Oligocene series; three specimens. 



Bluff one-half mile east of Porter Station, Grays Harbor County; 

 middle Oligocene series; one specimen having only the chelipeds 

 exposed. 



One and a half to two miles northwest of Galvin; middle Oligo- 

 cene; one specimen and impression. 



Sandy shale bluffs along the Chehalis River, northwest of mouth 

 of Lincoln Creek, Lincoln Creek; middle Oligocene series; a large 

 right manus. 



Near junction of Lincoln Creek and Chehalis River some 5 (?) 

 miles northwest of Centralia; Lincoln beds, Oligocene series; one 

 male, holotype. Cat. No. 353567, U.S.N.M. 



i 



Nehalem River, ford north of Mishawaka, Clatsop County: Oligo- 

 cene series; one right chela; Cat. No. 166468, U.S.N.M. 



Sandy shale cut along the Corvallis and Eastern Railway between 

 Rock Point and Oysterville, Yaquina Bay; Oligocene series; one 

 carapace and portions of a major and a minor cheliped. 



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