1895.] NATURAL, SCIENCES OF PHILADELPHIA. 177 



b x . Carapace with three spines: one in the median line, and two 

 laterals. 

 c : . Fifth segment of the abdomen on the posterior margin with- 

 out spines. Hand more stout, about three times as long as 

 broad Or. orangon. 



SUBSPECIES. 



d x . All segments of the abdomen rounded dorsal ly. 



Cr. orangon (many). 



d. 2 . Some of the posterior segments of the abdomen sculptured. 



e,. Fourth and fifth segments (seldom also the third) with a 



feeble longitudinal keel, sixth and seventh feebly furrowed. 



Or. orangon affinis (many). 



e 2 . Third to fifth segment without keels, sixth with two dis- 

 tinct keels, seventh furrowed . . Cr. orangon allmanni (1). 

 c 2 . Fifth segment of the abdomen on the posterior margin, near 

 the median line, with a posteriorly projecting spine on each 

 side. 



d x . Hand more slender, about four times as long as broad. Ab- 

 dominal segments rounded above . Or. franciscorum (many). 

 d 2 . Hand more stout, about three times as long as broad. Sixth 

 and seventh segment of abdomen furrowed. 



Cr. antarcticus. 



l> 2 . Carapace only with a spine in the median line, the lateral ones 

 wanting Cr. oaperms. 



Subgenus SCLEROCRANGON G. O. Sarr, 1885. 

 G. O. Sars, Den Norsk. Nordhavs Exped., Zool., Crust. I, 1885, p. 14. 



1. Crangon (Sclerocrangon) salebrosus Owen, 1839. 



Crci)iffon salebrosus Owen, Crust. Zool. Beechey's Voy. Blor,soni, 1839. p. 88, 



pi. 27, fig. 1. Stimpsou, Proc. Acad. Nat, Sci. Philadelphia, 1860, p. 25. 



Kingsley, Bull. Essex Iustit., 14, 1S82, p. 129. Stuxberg, Vega. Exped. Y, 



1887, p. 53. 

 Cheraphilus ferox G. O. Sars, Arch. Mathem. Naturvid. II, 1877, p. 339. 

 Sclerocrangon salebrosus (Ow.) G. O. Sars, Den Norsk. Nordb. Exped., Zool., 



Crust. I, 1885, p. 15, pi. 2. 



Geographical distribution: Northern circumpolar. — Kamschatka 

 (Owen): Avatska Bay, 10 fath. (Stimpson), Spitsbergen, Jan. 

 Mayen; off Norway, 100-459 fath. (G. O. Sars), Kara Sea, 55-60 

 fath. (Stuxberg). 



2. Crangon (Solerocrangon) atox Faxon, 1893. 

 Faxon, Bull. Mus. Comp. Zool. 24, 1893, p. 199. 



Geographical distribution: Western coast of Mexico, 660-676 

 fath. (Faxon). 



