. Bulletin - United States National Museum. Science. THE CANCKOID CRABS OF AMERICA 233 partly confluent; the next in size is near the inner angle of the region; behind are 2 very small unequal elevations or tubercles. A well-marked 6-parted fan diverges from the posterior margin, the tips of the divi- sions tuberculiform. The antero-lateral area is a smooth concave basin (including the hepatic region). The lateral rim is strongly as- cending, teeth anomalous, oblong, flat, widening from base to ex- tremity, and therefore overlapping; only a slight vestige of a normal midrib is visible in a sho
. Bulletin - United States National Museum. Science. THE CANCKOID CRABS OF AMERICA 233 partly confluent; the next in size is near the inner angle of the region; behind are 2 very small unequal elevations or tubercles. A well-marked 6-parted fan diverges from the posterior margin, the tips of the divi- sions tuberculiform. The antero-lateral area is a smooth concave basin (including the hepatic region). The lateral rim is strongly as- cending, teeth anomalous, oblong, flat, widening from base to ex- tremity, and therefore overlapping; only a slight vestige of a normal midrib is visible in a short ridge terminating in a small incurved spine or spinule; the margin from the first to the eighth tooth is finely and obscurely granulate, from the ninth tooth backward coarsely so. The edge of the inner tooth of the orbit is coarsely gran- ulate, that of the middle tooth of the orbit and of the three teeth of the front have granules of intermediate size. Upper surface of chelipeds rough as in form a, outer surface of palms nearly smooth. Only males of this form or approaching this form have been observed. The remarkable variation in form is paralleled in C. am/pJiioetus. Color.—Areolae bright red, chelipeds and legs flesh color, fingers black (Walker). Dark red above, lighter beneath; walking legs in some cases with light spots which tend to give the legs a some- what banded appearance. There is considerable variation in color; in some specimens a very irreg- j-jgure 37.—cancer ular band of orange or yellow extends across the oregonensis, male , • . ,1_ T -j^l .1 (3076), OUTER MAX- carapace anterior to the cardiac groove, with the illiped x4 whole carapace more gray and more or less spot- ted ; in others the median line from the posterior end to beyond the cardiac groove shows very gray (Way). Measurements.—Female (14964), length of carapace , width of same , fronto-orbital width , width of front between antennae 7, width between tips of inner orbital teet
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