THE FOSSIL STALK-EYED CRUSTACEA 79 



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

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

 series; one female, showing carapace and abdomen. Cat. No. 353566, 

 U.S.N.M. " Horizon 200 or 300 feet above the other specimens." 

 ' Relation. — This species is nearest to P. subovata Rathbun ^^ from 

 the Gulf of California, which has a higher hepatic region, a mar- 

 ginal line of granules on the hepatic region and between the two 

 posterior spines, and fewer dorsal granules and those more or less 

 sunken. 



Family CALAPPIDAE Dana 



Carapace more or less oval or subcircular. Afferent openings to 

 gill chambers lie in front of chelipeds. Antennae small. Legs 

 normal. Male genital openings coxal, female sternal. 



Genus CALAPPA Weber 



BOX CRABS 



Calappa Weber, Nomenclator Entomologicus, 1795, p. 92 ; type, C. granulata 

 (Linnaeus). 



Carapace strongly convex, rounded in front, much broadened 

 behind by a pair of clypeiform wings, beneath which the legs are 

 concealed in flexion. Front small, somewhat triangular, bilobed; 

 orbits small, circular. Chelipeds very large and in flexion fit closely 

 the front half of carapace; the arm has an outer distal wing; hand 

 strongly compressed, its upper border forming a high dentate crest. 

 Chelipeds equal except for the fingers which on one hand have out- 

 side near the base a stout projecting lobule. Abdomen of adult with 

 third, fourth and fifth segments fused. 



Eocene — Recent. 



CALAPPA LANENSIS, new species 



Plate 19, figs. 1 and 2 



Description. — The postero-lateral tooth is triangular (pi. 19, fig. 

 1), broader at base than the length of its sides, spine-tipped, spine 

 broken off. In front of this tooth there is a row of five teeth on the 

 wing, of which the first or most posterior reaches laterally a little 

 further than the postero-lateral tooth; the others become progres- 

 sively smaller, the last two very small and little projecting. The 

 posterior border of the wing bears two teeth, smaller than the pos- 

 tero-lateral tooth and more projecting, the inner tooth smaller than 

 the outer. The median portion of the posterior border is still more 

 produced and divided into three shallow lobes, the middle one twice 

 as broad as the outer ones. Lateral and posterior margins granu- 



2«Proc. U. S. Nat. Mus., vol. 16, 1893, p. 256. 



