Rev. T. R, R. Stebbiii'x on Arctic Crustacea. 



Genus ScLEROCRANGON, Sars, 1882. 



1832. Sderocrangon, Sars, Forli. Selsk. Christian, no. 18, p. 4o. 

 1885. Sderocrangon^ Sars, Norwegian North-Atlantic Exp. vol. xiv., 

 Crust, pt. 1, p. 14. 



Sderocrangon ferox^ Sars. 



1876. Cheraphilus ferox, Sars, Arch. Naturv. Christian, p. 339. 



1882. Cheraphilus ferux, Hoek, Nied. Arch. f. ZooL, Suppl. vol. i. p. 9, 



pi. i. tig. 3. 

 1885. Sderocrangon salebrosus, Sars, Norwegian North- Atlantic Exp. 



vol. xiv., Crust, pt. 1, p. 15, pi. ii. 

 1887. Sderoc7-angun ferox, H. J. Hansen, Dijmphna Krebsdyr, p. 236. 

 1890. Sderocrangon ferox, Sars, Arch. Naturv. Christian, vol. xiv. 



p. 180. 



The dentiform projections on the lower margins of the 

 pleon-segments afford an easily observable distinction between 

 this species and the Sderocrangon boreas of Phipps. In 

 Sderocrangon Agassizii, S. I. Smith, the first pleon-segment 

 lias an obtuse tooth on the lower margin and the second lias 

 a slight tooth, but the following segments have the lower 

 edges unarmed. Hansen points out that the Crangon sale- 

 brosus of Owen cannot b'^ identified vvitii the present species, 

 since, besides other diffi rences, it is described as haviug the 

 carapace septenicarinate. 



Mr. Bruce's specimens were obtained between 76° 24' N., 

 33° 43' E., and 76° 47' N., 29° 55' K, at depths of 100 and 

 110 fathoms ; at 77° 14' N., in 76 fathoms. 



Genus Spirontocaris, Spence Bate, 1888. 



Spirontocaris polaris (Sabine). 



1821. Alpheus polaris, Sabine, Parry's Voyage, Appendix no. x., 



Zoology, p. 60, pi. ii. figs. 5-8. 

 1835. Hippolyte polaris, Owen, Ross's 2nd Voyage, App., Zool. 



p. Ixxxv. 

 1835. Hippolyte borealis,Oweia, ibid. p. Ixxxiv, pi. B, fig. 3._ 

 1842. Hippolyte polaris, Ki'oyer, Monogr. Hippolyte's nordiske Arter, 



p. IKi, pi. iii. figs. 78-81, pi. iv. fig. 82. 

 1842. Hippolyte borealis, Kroyer, ibid. p. 122, pi. iii. figs. 74-77. 

 1879. Hippolyte polaris, S. I. Smith, Tr. Connect. Ac. vol. v. pt. 1, 



p. 80, pi. xi. figs. 1-4. 

 * 1886. Hippolyte polaris, Kcelbel, Crustacean von Jan Mayen, p. 11. 

 1887. Hijjpolyte polaris, Hansen, Dijmphna Krebsdyr, p. 239. 

 1899. Spirontocaris polaris, Scott, Journ. Linn. Soc. London, Zool. 



vol. xxvii. p. 63. 



From Sabine onwards authors have noticed the great 



