Rev. T. R. R. Stebbint; on Arctic Crustacea. 9 



'& 



curious reading of the name, Uippolyte sjyina, as if spinus were 

 an adjective. Spence Bate emphasizes the variability of the 

 species by describing seven varieties. According to Kcelbel 

 the branchial formula is the same as in Spirontocaris polaris^ 

 except for the additional epipod in the present species, which 

 has one on the third trunk-leg, as observed by Kroyer. 



Specimens were obtained at 76° 17' N., 21° 36' E., in 

 60 fathoms depth. 



Spirontocaris Gaimardii (Milne-Edwards). 



1837. Hippolyte Gaimardii, Milue-Edwards, Hist. Nat. Crust, vol. ii. 



p. 378. 

 1842. Hippolyfe Gaimardii, Kroyer, Hippolvte's oordiske Arter, p. 74, 



pi. i. %3. 21-:^9. 

 1842. Hi2)polyte (jihha, Kroyer, ibid. p. 80, pi. i. fig. 30, pi. ii. figs. 31-37. 

 1864. Hippolyte Gaimardi, Goes, Crust, podophth. Sueciae etc., (Efv. 



Vet.-Akad. Forh. p. 168 (extr. p. 8). 

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



p. 67, pi. ix. ligs. 8, 9. 

 1882. Hippolyte Gaimardii, Hoek, Crust. Willem Barents, Nied. Arch. 



fiir ZooL, Suppl. vol. i. p. 13. 



1886. Hippolyte Gaimardii, Koelbel, Crustaceen von Jan Mayen, p. 12. 



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



1888. Hetairus Gaimardii, Bate, Rep. Vo}'. ' Challenger,' vol. xxiv. 

 p. 611, pi. cix. fig. 2. 



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



Series, vol. Ixxiii. p. 235. 

 1899. Spirontocaris Gaimardii, Scott, Jouru. Linn. Soc. Loudon, Zool. 



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



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

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

 the rostrum. According to Kcelbel 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 Belcherij Bell 

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

 to unite Hippolyte pandaliformis, 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. Bruce. It has the 

 third pleon-segraent dorsally produced over the next with a 

 rather broadly rounded apex, above which, but not reaching 

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

 The rostrum has four teeth below and eight above, in addition 

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



* Miss M. J. Ixathbun, however, keeps them distinct, but without 

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

 or near the Pribilof Islands.' • 



