1879.] Vt [Kingsley. 
CANCROIDEA. 
Family CANCRIDZ. Sub-Family XANTHINE. 
Genus PANoPEus Edwards. 
Panopeus affinis Streets and Kingsley. 
Panopeus transversus Lockington, Proc. Cal. Acad., vir, 102 (1876) 
non Stm. Panopeus affinis Streets and Kingsley, Bulletin Essex 
Inst., Ix, 106 (1877). 
Carapax depressed, slightly convex, and with the exception of 
frontal and antero-lateral portions which are granulate and sparsely 
pubescent, the surface is smooth and naked. Front rather prominent, 
bilobed, the lobes being truncate, not sinuate, the sides more ad- 
vanced than the middle. The two fissures of the upper margin of the 
orbits more distinct than in P. transversus; the inner portion of the 
upper margin is elevated, forming a distinct angle with the upper sur- 
face of the frontal region. Antero-lateral margin with teeth rather 
than lobes, the first (the second normal tooth united to the angle of 
the orbit) is slightly sinuate as in P. crenatus, but is not so broad as 
in that species. Remaining teeth acute with their exterior margins 
arcuate, the margins of all the teeth slightly elevated. Under sur- 
face granulate, pubescent, subhepatic tubercle indistinct. Chelipeds 
unequal, carpus of each smooth, with a short spine on the inner mar- 
gin; large hand smooth, the tooth on the outside of the palm ob- 
solete; dactylus of larger hand with a strong basal tooth. Palm of 
smaller hand roughened above; fingers of both hands with longi- 
tudinal impressed lines, better defined, however, on the smaller. 
Remaining feet compressed, pubescent; dactyli of second, third 
and fourth pairs long and slender, of fifth pair much shorter. Ter- 
minal segment of male abdomen no broader than the preceding joint, 
sides slightly arcuate, tip rounded. 
Lower California. W. N. Lockington. 
Length of carapax, J, 10.8 mm., 2, 12.7 mm,; breadth, 3, 15.2 
fine 2) 16.7 mm.; ratio, d, 1: 1.41, 21: 1.31. 
It is closely related to P. transversus Stm., and P. crenatus Edw. 
and Lucas, but is distinguished from both by the truncate, non 
sinuate front and the less lobular teeth of the antero-lateral margin 
with their elevated borders. From P. crenatus it is also separated 
by the presence of a sub-hepatic tubercle and a more depressed car- 
apax ; from P. transversus by the more concave upper margin of the 
orbit, its elevated inner portion and the more acute carpal spine. 
