-Decapods 9 a 



Family CANCRID^. 

 Genus Cancer Linnseus. 



Cancer magister Dana. 



(Dana, Proo. Acad. Nat. Sci. Philadelphia, 1852, p. 73; Crust. U. S. Exploring Exped., part I, 

 1852, p. 151; atlas, 1855, pi. VII, figs, la-d.) 



Beach at Orca (Cordova), Southeastern Alaska; September 5, 1916; station 

 60a; one carapace. 



Distribution. — Unalaska to Magdalena bay, Lower California; low water 

 to 50 fathoms. 



Superfamily OXYRHYNCHA. 



Family INACHIDyf;. 



Genus Hyas Leach. 



Hyas coarctatus Leach. 

 (Rathbun, Proc. U. S. Nat. Mus., vol. XVI, 1893, p. 69.) 



Off Icy cape, Arctic Alaska; lat. 70° 24' N., long. 161° 25' W.; 9-10 fathoms; 

 mud, with pebbles, but no algse; August 19, 1913; station 23; four d', four 9. 



Langton bay (East of Mackenzie river), Northwest Territories; October 

 26, 1910; Dr. R. M. Anderson; fifteen specimens (Amer. Mus. Nat. Hist.), two 

 of which were taken in the net in 8 fathoms of water. A note accompanying 

 the crabs states that they are known to the Kotzebue sound Eskimos as 

 'Pu-tu-ri-ak,' but are unknown to the people east of the Mackenzie. ^ 



Distribution (including Hyas coarctatus alutaceus Brandt) . — Arctic Siberia 

 to Langton bay; Bering sea to Aleutian islands; Kamchatka; Okhotsk sea to 

 Korea (lat. 37° 02' N.); Baffins bay and Eastern Greenland to Hudson strait 

 , and bay; and southward to off cape Hatteras, North Carolina; Iceland; Northern 

 Europe southward to about lat. 49-5° N. (Dons); shallow water to 906 

 fathoms.^ 



Various larvse from the following stations have been referred to this species: 

 \ Off Cooper island, point Barrow, Alaska; surface; August 27, 1913; stations 

 25 6, c; three zoese. 



Off cape Lisburne, Arctic Alaska; lat. 68° 48' N., long. 165° 10' W.; surface; 

 August 16, 1913; stations 21 c, d, e, f; three specimens of zoese, more than 

 twenty-five specimens of megalopa, first form, with three-spined front, eight 

 specimens of megalopa which may be a development from the preceding and 

 from which the median or rostral spine has disappeared. 



Off Nunivak. island, Bering sea; lat. 60° 09' N,, long. 167° 38' W.; surface; 

 July 6, 1913; about 50 zoeae. 



South of Shumagin islands; lat. 54° 30' N., long. 159° 42' W.; surface; 

 July 1, 1913; stations 13 a, h, c; three megalopa, second form. 



The zoeae and first megalops resemble those of Hyas araneus " areneus " 

 described and figured by Williamson, Fisheries Board, Scotland, Sci. Invest., 

 1909, I (Dec, 1910), pp. 1.5-16, pi. I, figs, land 2. WiUiamson considered 

 that his megalopa moulted into the first crab stage. The rostrum of a similar 

 megalops, but with longer median spine, is figured as H. coarctatus by Bjorck, 

 Acta Reg. Soc. Physiog. Lundensis, n.f., vol. XXIV, 1913, p. 22, text-figs. 1 and 2. 



^These specimens have been identified by Dr. W. G. Van Name and the information communicated by Dr. Roy W. 

 Miner, of the American Museum of Natural History. 



. ^A station label indicating this great depth accompanies the specimen so recorded (see Hansen, Danish Ingolf-Expedi- 

 tion, III, 2, 1908, p. 16), but an error may, of course, have been made at the time of collection. . 



