8 Rev. T. E,. R. Stebbing on Arctic Crustacea. 



variability in tlie number of the tectli of tlie rostrum both 

 above and below. Professor Smith's conclusion that no 

 specific distinction is tenable between panaris and boreah's has 

 been generally accopted. The American professor is also 

 inclined to believe that Hippoli/te cuJteUata, Norman, 1867, is 

 another synonym, and Norman himself (Ann. & Mag. Nat. 

 Hist. ser. 6, vol. xiii. p. 270) accepts it as such. It may be 

 noticed that culteJlatiun is a word used by Kroyer in describing 

 the rostrum alike oi jwlaris and borealis. The variability in 

 the pterygostomian spines (to disappearance) and in the 

 number of dorsal aculei (from four to ten pairs) on the telson 

 is iully discussed by Professor Smith. Koelbel gives the 

 branchial formula as comprising a podobranchia on the second 

 maxilliped, an epipod on each of the five appendages from 

 the first maxilliped to the second trunk-leg, and a pleuro- 

 branchia on each of the five successive trunk-legs. As this 

 species has seven subdivisions to the fifth joint of the second 

 trunk-legs, or, in brief, a seven-jointed wrist, it seems proper 

 to include it in the genus Spirohtocaris. Hansen mentions 

 77 millim. as the length of a very large male. 



A large specimen {about 3 inches long), with others not so 

 large, was obtained at 70° O.r N., 41j° 10' E., in 20 fathoms. 

 A small specimen (about 1^ inch long), with eight pairs of 

 dorsal spines on the telson and eight apical spines, of which 

 the median six are subequal, was taken at 76° 29' N., 

 19° 08' E., in 140 fathoms. 



S])irontocaris spin us (Sower by). 



1805. Cancer spinus, So-n-erby, British Miscellany, p. 47, pi. xxiii. 

 1814. Alphceus spinus, Leach, Ediub. Encycl. vol. vii. p. 431. 

 181.5. A/p/ieus i^innns, Leach, Trans. Linn. Soc. London, vol. xi. p. 347. 

 1817. Hipjwiyte Sutcerlmi, Lt;n,ch, Malac. Podophth. Britanuise, 



pi. xxxix. 

 1837. Hippohfte Soioerbyi, Milne-Edwards, Hist. Nat. Crust, vol. ii. 



p. 380. 

 1842. Hippoli/te Soiverhei, Kroyer, Ilippolyte's uordiske Arter, p. 90, 



pi. ii. figs. 4.5-.54. 



1879. Ilippohjfe spinus. S. I Sniith. Tr. Connect. Ac. vol. v. pt. 1, p. 08. 

 1882. Hip/johjte spitms, Hoek, Crust. Willem Barents, in Nied. Arch. 



fiir Zool., Suppl. vol. i. p. 1.5, pi. i. figs. 4-7. 



1880. Hippolytc spinus, Kcelbel, Crustaceen von Jan ^layen, p. 11. 

 1888. Spirontocaris spinus, Bate, Rep. Voy. ' Challenger,' vol. xxiv. 



p. 596, pis. cvi., cvii. 



Tl'.e synonymy may with little doubt be amplified by the 

 names lIi}>polijte Liljehorgij Danielssen, 1861, and Llippolyle 

 securifrons, Norman, 1803. Stimpson in 1860 adopts the 



