Rev. T. ]\. R. Stebbing on Arctic Crustacea. 9 



curious leading (it tlie name, f/ippoh/te sphin, as if spimis were 

 an adjective. Speuce Bate emphasizes tlie variability of the 

 s|)ecies by descrilMiig seven varieties. According to Koelbel 

 the branchial forniuhi is tlie same as in Spirontucaris polaris^ 

 except for the additional ej)i|jod in the present species, which 

 has one on the third trunk-log, as observed by Kioyer. 



S|)ecimens were obtained at 76° 17' N., 21° 36' E., in 

 60 fathoms depth. 



Spirontocaris Gaimardii (Milne-Elwards). 



1837. Hippolytt' Gaimardii, Miliie-Ed wards, Hist. Nat. Crust, vol. ii. 



p. 378. 

 1842. Hippoli/te Gaimardii, Krover, Hippolvte's nordiske Arter, p. 74, 



pi. i. tips. 21-L'O. 

 1842. Hij)pohitf yihha, Krover, ibid. p. 80, pi. i. fig. ;JO,pl. ii. figs. 31-37. 

 18(>4. Ilippohjti- Gaimardi, Goes, Crust, podophth. Suecite etc., <Efv. 



Vet.-Akad! Forh. p. 168 (e.xtr. p. 8). 

 1870. Jlippolyte Gaimardii, S. 1. Smith, Tr. Connect. Ac. vol. v. pt. 1 , 



p. 07, pi. ix. tigs. 8, 9. 

 18S2. Hippohjte Gaimardii, Hoek, Crust. Willem Barents, Nied. Arcli. 



fiir Zool., Suppl. V'll. i. p. 13. 

 188(). Hippolyte Gaimardii, Kcelbel, Crustaceen von Jan Maven, p. 12. 



1887. Hippolyte Gaimardii, Hansen, Dijmphna Krebsdyr, p. 238. 



1888. Hetairus Gaimardii, Bate, Rep. ^'oy. ' Challenger,' vol. xxiv. 

 p. Oil, pi. cix. fig. 2. 



1893. Spirontocaris Gaimardii, Stebbing, Hist. Crust., Internal. Science 



Series, vol. Ixxiii. p. 2.3o. 

 1890. Spirontocaris Gaimardii, Scott, Journ. Linn. Soc. London, Zool. 



vol. xxvii. p. 63, pi. iii. figs. 1, 2. 



This species is notable for the absence of tlie pair of spines 

 so commonly found in this genus over the eyes at the base of 

 the rostrum. According to Koelbel the branchial formula is 

 the same as that of Spirontocaris polaris. Goes has been 

 followed by subsequent authors in uniting the forms gibha and 

 Gaimardii*. With these he united Hippolyte Belcheri, Bell 

 (Belcher's ' Voyage/ p. 402, pi. xxiv. fig. 1), and was inclined 

 to unite Hippolyte pandalijormis, Bell (Brit. Stalk-eyed 

 Crust, p. 294). Hoek considers that they should both be 

 regarded as synonyms of Gaimardii. A specimen measuring 

 2^ inches in length was obtained by Mr. 13iuce. It has the 

 third pleon-segment dorsally produced over the next with a 

 rather broadly rounded apex, above which, but not reaching 

 beyond it, is a narrow, tiiough not acute, median projection. 

 Tiie rostrum has four teeth below and eiglit above, in addition 

 to three on the carapace. The dorsal spines of the telson 



• Mi.-s M. J. lluthbun, however, keeps thcni distinct, but without 

 cciniment, in her recently published ' List of Crustacea known to occur on 

 or near the Pribilof Islands.' 



