c.imiilliin Arctic Expedition, 1913-18 



the west. Th" discovery of this specimen at point Barrow extends the range o 

 this specie- con.-ideralily to the east. 



Juvenile specimens of some form of Pseudalibrotus were obtained at Station 

 Kb, ;>()/> both in Dolphin and I'nion strait), and 56a, (Harrison bay, Alaska), 

 l.ui :in\ specific identification of such specimens would be very doubtful. 



11. Socarnes bidenticulatus (Bate). 



l.s.Ti. <;,u,,n,<irns nngiix J. C. Ross, in Ross's Second voyage, Appendix, p. 87. 



I '.IDC,. Socarnes l>i<li-ntici<l<itnx STKHHI.\(;, Tierreich, Amph. I, p. 56, and synonymy. 



HKiii Socarnes l>iilf><linil<iti<s BRUGGEN, Mem. Acad. Imp. Sci. de St. Pe'tersbourg, sr. 8, vol 18, 

 No. 16, p. 12. 



I!ill2. Siiciirn,* bidenticulatus STEPHENSEN, Report on the Malacost., Pycnogonida, etc., collect- 

 ed by the Danmark Exped. to Northeast Greenland, p. 527. 



I'.UX. Xncdritt .s lii<lniticulatus STEPHENSEN, Account Crust, etc. collected by Dr. V. Nordmann 

 in Summer 1911 from West Greenland, p. 65. 



Station 42u: Bernard harbour, Northwest Territories, October 22, 1915, 

 from stomach of Erignathus barbatus (Erxleben); 5 specimens. 



Distribution. Arctic ocean, east and west coast of Greenland. 



12. Tmetonyx gulosus (Kroyer). 



1845. Aiwnyx gulosus KROYER, Naturh. Tidsskr., ser. 2, vol. I, p. 611. 

 1906. Tmetonyx cicada. STEBBING, Tierreich, Amph. I, p. 74, and synonymy. 

 1909. Tmetonyx cicada BRUGGEN, M6m. Acad. Imp. Sci. St. P6tersbourg, s6r. 8, vol. 18, No. 16, 

 p. 13. 



1911. Tmetonyx gulosus STAFFERS, Crust. Malacost., Campagne Arctique de 1907 du Due 



d'Orleans, p. 11, and synonymy. 



Station 29/: Lat. 70 13' N., long. 140 50' W., April 4, 1914, from stomach 

 of Phoca hispida Schreber, over about 30 fathoms; 4 specimens. 



Station 42w: Bernard harbour, Northwest Territories, October 22, 1915, 

 from stomach of Erignathus barbatus (Erxleben) ; 1 specimen. 



Station 43a: Dolphin and Union strait (off Cockburn point), Northwest 

 Territories, September 13, 1915, over about 50 fathoms of water, mud with 

 pebbles, but no algae; 2 specimens. 



Station 62a: Liddon gulf, Melville island, Northwest Territories, July, 

 1916, A. Castel collector; 2 specimens. 



Distribution. Arctic ocean, north Atlantic, North sea, France. 



13. Katius obesus Chevreux. 



1905. Katius obesus CHEVREUX, Description d'un Amphipode (Katius obesus nov. gen. et sp.) 



Bull. Mus. Oceanogr. Monaco, No. 35, 1915 (with figs). 



1906. Katius obesus TATTERSALL, Fisheries, Ireland, Sci. Invest. 1905, IV. 1906, p. 29. 



1912. Katius obesus STEPHENSEN, Vidensk. Meddel. fra den Naturh. Foren., Bd. 64, p. 89. 



Station 8a: Lat. 55 13' N., long. 140 21' W., June 26, 1913, surface; 1 

 specimen. 



This species is represented by a single badly preserved specimen which 

 differs only slightly from Chevreux's figure. His specimen was 12 mm. long, 

 while those obtained on the Tjalfe Expedition were 25 mm. The present speci- 

 men measures about 5 mm. which indicate that it is quite immature. The 

 presence of a double row of calceoli on each antenna would seem to indicate a 

 male. Chevreux's specimen apparently did not have the calceoli, but he was 

 not certain that it was a male. The eyes in our specimen are not present, as 

 nearly all of the internal organs have disappeared, leaving the interior entirely 

 empty. The 3rd uropods have the rami much narrower and the inner ramus 

 proportionately shorter than in Chevreux's figure. The type specimen was 

 obtained off the Azores, in water 0-3000 meters depth; the specimen obtained 

 by the Helga came from the west coast of Ireland, 1,200 fathoms, and the speci- 

 mens collected by the Tjalfe Expedition were from the southern coast of Green- 



