S66 Puget Sound Marine Sta. Pub. Vol. 1, No. 30 



One male secured by means of a trawl between the north end of 

 Brown Island and San Juan Island (2) had irregular spots of tan all over 

 the carapace. They are abundant in Argyle Lagoon (13) and can be 

 collected at low tide with a di}? net. They are also found in the channel 

 between the north end of Brown Island and San Juan Island (2) on a 

 nmddy bottom at 1 1 fathoms. 



4. Cancer oregonensis (Dana) Rathbun. haiby cancer crab (fig. 23) 



Trichocera oregonensis Dana ; Trichocarcinus oregonetisis Holmes ; 

 Trichocarcinus walkeri Holmes. 



Rostrum none; interantennal margin grooved, 2-lobed. Antennae 

 mostly short, hairy, longest hairs on inner margin and at the base. Eye- 

 stalks with small tooth on anterior surface ; teeth on the margin serrate and 

 pointing towards anterior, alternate ones are more acute, first sharp one is 

 the third from the front. Carapace round, without distinction between 

 anterior and posterior lateral margins as in most Cancer species ; surface 

 very irregular, more deeply areolated in mature than immature specimens ;. 

 fringe of hairs about the posterior part of carapace more noticeable in 

 young specimens. Chelipeds large, claws dark colored ; hands and carpus 

 with longitudinal rows of tiny elevations, the most dorsal one on the 

 hand has the largest elevation ; carpus with 2 spines at distal ends, 1 on 

 the dorsal side, the other on the inner side and somewhat below it. Walk- 

 ing legs quite hairy; some with light spots which tend to give the legs a 

 somewhat banded appearance. Color dark red above, lighter beneath. 



Those dredged off west side of Shaw Island showed considerable 

 variation in color. In some a very irregular band of orange or jellow 

 extends across the carapace anterior to the cardiac groove. The whole: 

 carapace is more gray and is more or less spotted. In some the median 

 line from the posterior end to beyond the cardiac groove shows very gray. 



Found at extreme low tide buried in mud and fine sand under rocks,, 

 at 6 to 55 fathoms. They are very abundant on the gradual rocky slopes 

 on the northeast corner of Brown Island (8), but become very scarce be- 

 low this point on the whole eastern side until the southeast corner is 

 leached. Even here they are not numerous as at the northeast corner. A 

 few were found on the southeast corner of Brown Island (8). Also found 

 at Turn Rock (12) ; beach between Marine Station (5) and Friday Harbor 

 Cannery (4); Newhall's beach (5); channel between Turn Island and 

 San Juan Island (10); and all the rocky points from Madrona Point 

 around to Argyle (14). 



