364 Puget Sound Marine Sta. Pub. Vol. 1, No. 30 



ridges between the grooves marked by little rows of stifif hairs. Color 

 varying from a yellow-brown to dark red. The propodi and dactyls and 

 some portions of the carapace show the red distinctly. 



Found along shore at low tide and in shallow water. Not abundant. 

 Three specimens were found in Argyle Lagoon (13) and a few at 6 fathoms 

 between Turn Island and San Juan Island (10); also some off Canoe 

 Island (16); one on the south end of Brown Island (8) and a few along 

 the shore from Madrona Point (7) to Minnesota Reef (11). 



Genus Cancer. 



KEY TO SPECIES 



A. Front of 5 teeth; carapace much wider than long. 



B. Front of 5 subequal teeth^ greatly produced; dactyls of chelipeds- 

 black on inner margin for almost the whole length ; lobes of margin 

 of carapace not spine-tipped. 1. C. productus- 



BB. Front of 5 unequal teeth, not produced; dactyls of chelipeds not 

 dark colored, white-tipped; lobes of margin of carapace spine- 

 tipped. 

 C. Carapace surface finely tubercled ; spine outside of second an- 

 tennae large, blunt; hands with longitudinal rows of roughened 

 tubercles; dactyls of last pair of walking legs flattened. 



2. C. magister 



CC. Carapace surface smooth; spines outside of second antennae 



very small; hands with slight indications of ridges, but neither 



roughly tubercled nor spiny; dactyls of last pair of walking 



legs not flattened, 3. C. gracilis 



AA. Front not of 5 teeth ; carapace sub-orbicular. 4. C. oregonensis 



1. Cancer productus Randall. edible cancer crab (fig. 19) 



Platycarcinus productus Gibbes ; Cancer perlatus Stimpson. 



Carapace wide for its length; antero-lateral edges margined by 10 

 teeth, the last 3 or 4 with acute tips which point to the anterior; closed 

 fissures between the marginal teeth mark the carapace ; interorbital portion 

 of carapace extending forward more than the other parts and is one of 

 the distinguishing characteristics of this species ; carapace somewhat tuber- 

 cled but not so uniform as in other species; female higher through the 

 median line than the male. Chelipeds large, powerful, more ridged longi- 

 tudinally in the adult than in the young; inner ridge of carpus projecting 

 forms a large tooth at the distal end, another large tooth on the margin 

 near the hinge which is opposite the rounded elevation on the hand; inner 

 edge of dactyl darkened almost to proximal end, outer edge darkened about 

 one-half the distance. Dactyls of walking legs with longitudinal ridges. 



