llcv. T. K. R. Stcbbin^ oii, Arctic Crustacea. 7 



Genus ScLEROCUAXGOy, Sai's, 1SS2. 



lii^'2. Sclerocrauytm, Surs, lAn-li. Sulsk. Cluiatiau. iiu. IH, p. t.">. 

 1880. Silrrocraiujon, fSars", Norwcyiuu North-Atlantic Lxp. \ul. xiv., 

 Crust, pt. 1, p. 14. 



Sclerocratujon /('ro.Cy Sar.s. 



187(5. Cketuiphihi^feio.v, Sars, Arch. Natiirv. ('hri.stinn. p. 3.'{9. 



1882. C7uT(tj)/iiluii/eru.c, iloek, Xiod. Arch. f. Zoo!., Suppi. vol. i. p. 9, 



pi. i. ti;;. ;i. 

 I880. tSclentcranffon salebrosus, Sal's, \or\ve;,Mnn North-Atlantic Exp. 



vol. xiv., Crust, pt. 1, p. 1"), pi. ii. 

 1887. Silvrocrawjun fero.v, II. J. Hansen, Dijmphna Krebsdyr, p. 236. 

 1890. Sclerovrauijon fcro.r, Sars, Arch. Naturv. Ciiristian. vol. xiv. 



p. 180. 



Tlic doiititonn ])rojei'tloii3 on the Iowcm- margins of the 

 pleon-se'^Miicntd afford an easily observaMe distinction between 

 this species and the SderocraiKjon horeas ot' l*hi[)[)s. In 

 Sclerocrungon Agassizii, S, I. Smith, the first j)leon-segment 

 has an obtuse tooth on the lower niarj^in and the second has 

 a sliglit tooth, but the following segments have the lower 

 edges unarmed. Hansen points out that the Cnnt'/on sale- 

 hrosus of Ovvcn cannot be identiriel wit!i the present species, 

 since, besides other difterences, it is tlescribi I as having the 

 carapace se|)t.emcarinate. 



Mr. Bruce's specimens were obtained between 76° 21' X., 

 33° 43' E., and 7(5° 47' N., 29° 5V E., at depths of lOl) and 

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



Genus SriHON roCAKis, S[)ence Hate, 1888. 



Spirontocaris polaris (Sabine). 



1821. Alpheus polan's, Sabine, Parry 'a Voyage, Appciulix uo. x., 



Zoology, p. 60, pi. ii. figs. o-S. 

 18-"»o. Uippolyte poUiris, Oweu, Ross's 2nd Voyage, App., Zoo). 



p. Ixxxv. 

 183o. IlippoJyte borealis, Owen, ibid. p. Ixxxiv, pi. B, fig. 3. 

 1842. Ilippoli/lc polari.i, Kriiver, Monogr. liippolyte's nordisko Arter, 



p. llf., pi. lii. figs. 78 81, pi. iv. fig. S2. 

 1842. Jlippoli/le borealis, Kroyer, ibid. p. 122, pi. iii. figs. 74-77. 



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

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



1880. llipp'lytc polnrin, Kcclbel, Crustaceen von Jan Mayen, p. 11. 

 1887. Hippolyte polaris, Hansen, Dijmphna Krebs<lyr, p. 239. 



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

 vol. xxvii. p. ()3. 



From Sabine onwards autliois have noticed the great 



