40 Canon A. M. Norman on British Amphipoda. 



tli an the second ; flagellum of twenty-four articulations. 

 Lower antennae with the last joint of the peduncle one fourth 

 shorter than the penultimate ; flagellum of twenty-one articu- 

 lations. First gnathopods (fig. 2) having the lobe of the 

 meros w r ell rounded at the extremity ; hand slightly longer 

 than the wrist, widening distally ; palm defined, occupying 

 the slightly oblique extremity. The hand of the second 

 gnathopods (fig. 3) elongated ovate, widest in the middle, 

 front margin evenly and regularly arcuate, fringed throughout 

 with long setae, the length of which almost equals the breadth 

 of the hand, wholly without spines, tubercles, or crenation, 

 and the palm undefined ; finger broad, extending to only half 

 the length of the hand. The last peraeopods (fig. 4) have the 

 meral and propodal joints subequal in length, the carpal 

 joint somewhat shorter, the nail half as long as the propodos ; 

 the posterior lobe of the meros is well arched, but not greatly 

 developed, extending to half the length of the carpus. 

 Colour white, tinted with rose-colour; eye red. 



Hab. A single specimen taken at Plymouth, August 1889 

 (A. M. N.) : Mus. Nor. 



My dissection does not show the mandible, but from the 

 general character of the species it would seem to belong to 

 this genus. S. setosa has its nearest known ally apparently 

 in 8. Dollfusi, Chevreux *. It resembles that species in the 

 form of the first gnathopods and, judging from the drawing, 

 in the proportionate length of the joints of the last peraeopods ; 

 but it differs in the form of the second gnathopods and the 

 absence of all teething of the palm of its propodos. 



Genus 2. Metopa, Boeck. 



98. Metopa Alderi (Bate). 



1861. Montagua Alderi, Bate & Westwood, (1) vol. i. p. 61, $. 

 1868. Metopa norveffica, Bate & Westwood (nee Lilljeborg), (1) vol. ii. 



p. 500, J. 

 1876. Metopa clypeata, var., Boeck, (138) p. 451, pi. xviii. fig. 5, $ . 

 1892. Metopa Alderi, G. O. Sars, (142) p. 250, pi. xxxvi. 



Hah. Aberdeenshire (R. Dawson) : Mus, Nor. Northum- 

 berland coast (A.M.N.) ; Firth of Forth (T. 8.) ; Firth of 

 Clyde and Mull of Kintyre (D. R.) ; North Wales (A. 0. W.) ; 

 Torbay (Stebbing). 



Distrib. Norway, from the south northwards to Tromso 

 (G. 0. Sars); Spetsbergen and Sweden (Goes) ; Murman 



* Chevreux, " Quatrieme Campagne de ' l'Hirondelle,' 1888 : Hyale 

 Grimaldi et Stenothoe Dollfvsi" Bull, de Soc. Zool. de France, 1891. 



