178 RATHBUN 
CANCER OREGONENSIS (Dana). 
Plate vii, fig. 2. 
Trichocera oregonensis DANA, Proc. Acad. Nat. Sci. Phila., v1, 86, 1852; 
Crust. U.S. Expl: Exped., 1,299, 1852, pl. XVIII, fig. 5, 1855. 
Platycarcinus recurvidens BATE, Proc. Zool. Soc. London, 1864, 663. 
Trichocarcinus oregonensis MIERS, Proc. Zool. Soc. London, 1879, 34.— 
HOLMES, Occas. Papers Calif. Acad. Sci., VII, 54, 1900, and synonymy. 
Trichocarcinus recurvidens WALKER, Trans. Liverpool Biol. Soc., XII, 271, 
pl. Xv, figs. 1-1b, 1898. 
Trichocarcinus Walkeri HOLMES, of. Cit., 53. 
Harriman Expedition.—¥ox Island (Kincaid); Virgin Bay (Coe); 
Orca; Yakutat; Sitka. 
Distribution.—Aleutian Islands to Lower California (Holmes). Low 
water to 238 fathoms. 
I am unable to separate from typical C. oregonensis the form described 
by Walker under the specific name vecurvidens, and later by Holmes as 
Trichocarcinus walkeri, because the species displays more variation and 
intergradation than was known to those authors. Material from 43 
localities has been examined. In a lot of specimens collected by Dr. 
Dall at Coal Harbor, Unga Island, Alaska, are not only typical ovegonensis 
and typical wa/keri, but some with sculpturing and teeth intermediate 
between the two; others more deeply areolated than in typical qwadke77, 
but with teeth as narrow and well separated as in the other extreme of 
oregonensis. In a lot of fairly typical oregonensis from the Strait of Fuca 
(D. S. Jordan) is one in which many of the granules of the areolz 
are prolonged into conical spines. Still another variation is shown 
by a single male (plate vu, fig. 1) from station 3274 (Albatross), 
northeast of Amak Island, Alaska, 19 fathoms, where the lateral teeth 
are broader and more overlapping than in the specimen figured by 
Walker (/oc. cit.); the granulate areole are small, round, and raspberry- 
like, the interspaces much smoother than usual. 
Size.—The largest specimen measured is a female from Puget Sound 
(O. B. Johnson), 36.5 mm. long, 47.1 mm. wide. a 
Cancer oregonensis might well be set apart generically on account of 
the antero-lateral margins not being sharply marked off from the postero- 
lateral, in which respect it differs from the other species of Cancer, in- 
cluding C. gibbosulus and C. amphietus. The name Z7ichocarcinus is 
not, however, available for the species ovegonensis, as the type of Zricho- 
carcinus Miers, substituted for Zrichocera de Haan, preoccupied, is Cancer 
gibbosulus (de Haan). This species I consider a true Cancer (see p.176) ; 
therefore Z7ichocarcinus is a synonym of Cancer. 
