PART 1 garth: pacific oxyrhyncha 151 



bun, 1904), although not listed as such in Rathbun (1925), are be- 

 lieved to be Chionoecetes bairdi, as are specimens from Victoria, British 

 Columbia (Nevvcombe) and Burrard Inlet (north arm), 15 fathoms 

 (Taylor). 



Atlantic analogue: The species itself occurs in the North Atlantic, 

 via the Arctic Ocean, as far south as Casco Bay, Maine. A subspecies, 

 Chionoecetes opilio elongatus Rathbun, 1924a, occurs in the Sea of 

 Japan and in the Okhotsk Sea. 



Diagnosis: Carapace tuberculate, length and breadth subequal, bran- 

 chial regions not depressed, lateral margins exposed, not deeply scalloped. 

 Meri of ambulatory legs dilated, roughened but not spinulous. Ptery- 

 gostomian spines numerous and small. Exorbital tooth slightly in- 

 curving. Seventh segment of male abdomen strongly inserted into sixth. 

 Male first pleopod with tip reflexed ; 24 filaments arranged in two or 

 three rows on convex margin and about a dozen irregularly placed near 

 concave margin in the specimen examined. 



Description: Carapace with numerous scattered unequal rugose 

 prominences, blunt and wartlike about the middle, but becoming more 

 acute anteriorly and at the sides. Superior surface covered with a short 

 pubescence. The broad channels above the posterolateral margins nearly 

 smooth, but with their double margins granulated. Inferior anterolateral 

 margin armed with about fourteen small bifid teeth diminishing in size 

 forward. [Legs] everywhere slightly pubescent, with the [meri] scabrous 

 or echinulate above; [chelipeds] muricated along the angles, and every- 

 where somewhat scabrous on their upper surfaces. Abdomen consisting in 

 both male and female of seven articles, the three nearest the base being 

 strongly granulated. Abdomen of the male one-third the width of the 

 sternal plastron at its penultimate article, the inferolateral angles some- 

 what produced and tumid. (Stimpson, 1857b, modified, of C. 

 behringianus) 



Chelipeds one and one-half times as long as the carapace, in the old 

 twice as long; fingers half again as long as palm. First three ambulatory 

 legs about twice as long as carapace, in the old three times as long; 

 last leg much shorter, about as long as cheliped. Varies as to roughness 

 of carapace, amount of hairiness and length and width of legs, especially 

 of merus. (Rathbun, 1925) 



Material examined: Off Pribilof Islands, Alaska, 48 fathoms, August 

 3, 1891, Albatross station 3440, 1 male, identified by M. J. Rathbun 

 (U.S.N.M. No. 17075). (Photo) North of Bering Strait, Arctic 



