80 BULLETIN 138, UNITED STATES NATIONAL MUSEUM 



late. Outer orbital tooth not prominent; inner orbital tooth high. 

 Frontal teeth broken off. 



The carapace is traversed by two longitudinal, submedian fur- 

 rows and a transverse depression behind the orbits. Surface of 

 carapace and chela granulate, the granules visible without a lens 

 and near together but not touching except on the tubercles. Three 

 rows of five tubercles each ; of the median tubercles the two anterior 

 are the largest; of the lateral tubercles the three anterior are large 

 and the second one, counting from the front has a small, low tuber- 

 cle on its anterior, inner slope. Outside this row on each side there 

 are about 8 or 10 very low and inconspicuous tubercles irregularly 

 placed. 



The transverse distal crest (pi. 19, fig. 1) of the merus of the minor 

 cheliped is furnished with four teeth increasing in size below from 

 above, the two lower teeth prolonged in a spine. Surface of carpus 

 imeven, scarcely nodulous. Lower edge of manus (pi. 19, fig. 2) 

 straight; a longitudinally oblique furrow not far above lower mar- 

 gin ; it is smoother than the rest of the surface. Tubercles of rather 

 small size, arranged roughly in three transversely oblique rows, four 

 tubercles in the distal row, five in the next, three in the proximal 

 row. Eight teeth on upper border, of which six are crowded to- 

 gether forming the cock's comb, and the other two teeth are on the 

 slope leading down to the carpus. The customary large tooth or 

 spine is situated at the infero-proximal angle of the outer surface, 

 but it is in great part broken off. The outer aspect of the proximal 

 half of the dactylus is granulate; prehensile teeth and distal half 

 of the dactylus dark colored. 



Measurements. — Holotype, length of carapace 27.8 mm., width of 

 same 35.7 mm., length of minor manus measured from articulation 

 of carpus to sinus between fingers 16 mm., distal height measured 

 to base of teelh 14.8 mm. 



Occurrence. — Oregon: 1 mile south of Henderson Station (Spring- 

 field Junction), Southern Pacific Railroad, Lane County; Oligocene 

 series; one carapace with minor chela; Cat. No. 353350, U.S.N.M. 

 " Horizon 200 or 300 feet above the other specimens." 



Relation. — In shape resembles C. flammea, the Recent species found 

 on the east coast of the United States and southward; also in the 

 Miocene of Santo Domingo and the Pleistocene of Panama. The 

 carapace of the latter is much more extensively tuberculated and 

 the granulation more crowded; there is a small tooth on the pos- 

 terior margin between the submedian lobes and the teeth of the alate 

 expansion. The tubercles of the palm are distributed just as in the 

 fossil species, but those of the upper half and of the proximal row 

 are larger in flammea than the corresponding ones in lanensis. 



