178 PROCEEDINGS OF THE ACADEMY OF [1895. 



3. Crangon (Sclerocrangon) boreas (Phipps) 1774. 



Cancer boreas Phipps, Voy. North Pole, 1774, p. 190, pi. 12 fig. 1. 



Cancer hoinaroides Fabricius, Faun. Grönland. 1780, p. 241. 



Astacus boreas {Ph.) Fabricius, Entoniol. Syst, II, 1793. p. 483. 



Crangon boreas {Ph. ) Fabricius, Suppl. Ent. Syst. 1798, p. 409. Sabine, Suppl. 



Append. Parry's first Voy. 1824, 235. Milne-Edwards, Hist. Nat. Crust. 11, 



1837, p. 342. Kroyer, Naturh. Tidsskr., IV, 1842, p. 218, pi. 4, figs. 1-14. 



Milne-Edwards, Atlas. Cuvier, Eegn. Anim. pi. 51, fig. 2, (no date). 



Brandt, Krebse, in Middendorff's Siber. Eeis., II, Zool. 1851, p. 114. 



Danielssen, Beretn. Zool. Eeise, 1859. p. 4. Stimpson, Proceed. Acad. Nat. 



Sei. Philadelphia, 1860, p. 25. Buchholz, Zweite Deutsch. Nordpol. II, 



1874, Crust, p. 271. Kingsley, Bull. Essex Inst. X, 1878, page 54. Smith 



Trans. Conn. Acad., V, 1879, p. 56. Stuxberg, Vega Exped., V, 1887, 



p. 53. 

 Cheraphilus boreas {Ph.) Miers. Annal.Magaz. Nat. His. (4) XX, 1877, p. 57. 



Hoek, Niederl, Arch. Zool , Suppl. 1, 7, Crust, 1882. p. 10. Murdoch, Rep. 



Pol. Exped. Point Barrow, 1885, p. 139. 

 Crangon { Cheraphilus) boreas {Ph.) Miers, Jour. Linn. Soc, Zool. XV, 1881, 



p. 60. 

 Sclerocrangon boreas {Ph.) G. O. Sars, Christiania Vid. Selsk. Forh. 1882, p, 



7. G. O. Sars, Den Norsk. Nordh. Exp. Zool. Crust. II. 1886, p. 6. Koelbel, 



Die Oesterr. Polarst, Jan Mayen, III. 1886, Zool. E. p. 51. Ortmann, Zool. 



Jahrb. V, 1890, p. 532. 



Geographical distribution: Northern circumpolar. Norway 

 (Danielssen, G. O. Sars) Barents Sea and Nowaja Semlja, 25-140 

 fath. (Hoek); Franz Joseph Land (Miers); Beeren Island (G. O. 

 Sars); Spitzbergen, shallow Water (Hoek, G. O. Sars) Jan Mayen 

 (Kölbel); Iceland (Kroyer); east coast of Greenland, 4-27 fath. 

 (Bjichholz); west coast of Greenland, to 87° 44 v lat. northward 

 (Miers); Davis Strait and Melville Island (Sabine); N. E. coast of 

 America, from Labrador to Massachusetts Bay, 5-33 fath. (Smith) ; 

 northern coast of America to Berings Strait, 10-26 fath. (Stimpson); 

 Alaska: Point Franklin, 13 fath. and Port Clarence (Murdoch); 

 Siberia (Brandt, Stuxberg). 



4. Crangon (Sclerocrangon) sharpi mov. spec. 8 



Paracrangon echinatus Sharp inon Dana), Proceed. Acad. Nat. Sei., Phila- 

 delphia, 1893, p. 126. 



8 Description: Carapace with tbree keels, the median one with four long 

 spines, the first longest and placed on the upper margin of rostrum, which 

 extends a little beyond the eyes; the second spine nearly as long as the first, 

 placed immediately behind the base of the rostrum. The spines are directed 

 obliquely forward and upward. Lateral keels formed by four spines, the fore- 

 most, on the anterior margin of carapace near the base of antennte, is the longest, 

 and directed obliquely forward and outward, more than half as long as the cara- 

 pace; the three others are smaller, but sharp. Abdomen sculptured, first to sixth 

 segment with a median keel, that of the third arched and produced somewhat 

 posteriorly, that of the sixth finely furrowed and ending in two spines posteriorly. 

 Two other spines are placed at the posterior margin of this segment, one on each 

 side. Fifth segment, on the posterior margin, near the median line, with a sharp 

 spine on each side. Lateral faces of the first to fifth segment sculptured by two 

 irregular transverse furrows, sixth segment laterally with an indistinct longi- 

 tudinal ridge. Epimera of the first to fourth segment triangular, inferior angles 

 blunt, without spines. Keel of sternum dentate, but not spinoso-serrate. 



Two specimens are in the Museum of the Academy of Natural Science of 

 Philadelphia. 



