82 Bulletin, Vanderhilt Marine Museum, Vol. II 



Synonymy. — Hyas coarctatus Leach, Trans. Linn. Soc. London, vol. 

 11, p. 329, 1815; Malacostraca Brit., pi. 21B and text, 1816.— 

 S. I. Smith, Kept. U. S. Fish. Comm. for 1871-72, vol. 1, p. 548, 

 1873.— Kathbun, Proc. U. S. Nat. Mus., vol. 16, p. 69, 1893 ; in 

 Grenfell, Labrador, p. 481, 1909 ; Rept. Canadian Arctic Exped., 

 vol. 7, pt. A, p. 9A, 1919. — Birula, Ann. Mus. Zool. Acad. Imp, 

 Sei. St. Petersburg, vol. 11, p. 8, 1907. — Hansen, Danish Ingolf 

 Exped., vol. 3, pt. 2, p. 15, 1908. — Dons, Tromso Mus. Aarshefter 

 33, p. 158, pi. 1, figs. 14, 19, pi. 2, figs. 9 and 10, 1912-13 ; pi. 3, 

 figs. 3 to 8, text figs. A2, 4, 6 and 8, B2 and 2a ; Aarshefter 37, 

 p. 88, 1914.— Eathbun, BuU. 129, U. S. N. M., p. 258, pis. 94-95, 

 1925. 



Lissa fissirostra Say, Journ. Acad. Nat. Sci. Phila., vol. 1, p. 79, 1817, 



Hyas coardata H. Milne Edwards, Hist. Nat. Crust., vol. 1, p. 312, 

 1834; R. Anim. de Cuvier, disciples ed., p. 90, pi. 32, fig. 3. — 

 Birula, ihid., p. 445, 1897. 



Hyas serratus Hailstone, Mag. Nat. Hist., vol. 8, p. 262, 1835. 



Hyas hufonis White, List Crust. Brit. Mus., p. 6, 1847. 



Hyas coarctatus var. alutacea Brandt, in Middendordf 's Reise in den 



Aussersten Norden und Osten Sibiriens, Zool., vol. 2, pt. 1, p. 79, 



1851. 

 Hyas latifrons Stimpson, Proc. Acad. Nat. Sci. Phila., vol. 9, p. 217, 



1857.— Smithson, Misc. Coll., vol. 49, p. 9, pi. 2, 1907. 



Hyas coarctatus var. latifrons Braznikov, Mem. Acad. Imp. Sci. St. 



Petersbourg, ser. 8, vol. 20, No. 6, p. 43, 1907. 

 Hyas coarctatus alutaceus Birula, ihid., ser, 8, vol. 29, p. 4, pi. 1, figs. 



2-5, 1910. 

 Hyas coarctatus forma alutacea Dons, Tromso Mus, Aarshefter 37, p. 



86, footnote, 1915. 

 Hyas coarctatu ursinus Rathbun, Proc. U. S. Nat. Mus., vol. 64, art. 



14, p. 4, 1924. 



Genus : NIBILIA A. Milne Edwards. 

 Nibilia antilocapra (Stimpson). 



Plate 24, fig. A. 



Diagnostic characters : Carapace pyrif orm, rostrum very promi- 

 nent, deeply bifurcate. Orbit with a spinous tooth between the pre- 

 ocular and postocular units. 



