REPORT ON THE AMPHIPODA. 877 



Laphystius, Acanthozone, thus interposing between the two genera of Boeck's Epimerinaj 

 the four genera which Boeck assigns to the subfamily Iphimedinse, but this union of the 

 two groups scarcely seems admissible in view of the marked distinction exhibited by the 

 mouth-organs respectively of the one and the other. Boeck gives the following definition 

 of the Epimerinse : — 



" Upper Lip very broad, apically little insinuate. 



"Mandibles very strong, apically broad and dentate; the secondary plate robust 

 and dentate ; the spines of the spine-row numerous, broad, lanceolate, and serrate on the 

 convex margin. 



"First Maxillae strong; the palp two-jointed, its second joint apically armed with 

 few teeth ; the inner plate furnished with many setae on the inner margin. 



" Second Maxillae broad. 



" MoxUlipeds with the outer plates broad and dentate ; the palp elongate, robust, its 

 last joint unguiform. 



" The body very thick, robust, carinate and dentate (spinis armatum). The side-plates 

 large, rigid. The eyes prominent. 



"Antenna? with long flagella; the Upper Antennas without accessory flagellum. 



" First and Second Gnathopods slender ; the rest of the legs strong. 



" Uropods biramous ; the second pair shorter than the first, with the inner ramus a 

 little longer than the outer ; the third pair with the rami equal in length. 



" Telson rigid, of moderate size, apically a little incised." 



Genus Epimeria, Costa, 1851. 



1851. Epimeria, Costa, in Hope's Catal. Crost. ItaL, p. 46. 



1853. „ Costa, Rend. Soc. r. Borb. 



1857. „ Costa, Ricerche sui Crost. Amf. Nap., pp. 175, 197. 



1862. „ Spence Bate, Brit. Mus. Catal. Amph. Crust, p. 153. 



1867. „ Costa, Saggio coll Crost. Medit., No. 45. 



1869. „ Norman, Last Report Dredging, Shetland, p. 280. 



1870. „ Boeck, Crust, amph. bor. et arct., p. 105. 

 1876. „ Boeck, De Skand. og Arkt. Amph., p. 232. 



1878. „ Chatin, Ann. des Sci. Nat., ser. 6, Zool. Tome vii. 



1879. „ Sars, Crust, et Pycn. nova, p. 450. 



1882. „ Sars, Oversigt af Norges Crustaceer, p. 100. 



1885. Acantlionotm, Carus, Prodr. Faunas Mediterranean p. 410. 

 1885. Epimeria, Sars, Den norske Nordhavs-Exp., p. 166. 



For the original definition, see Note on Costa, 1851 (p. 250). Boeck defines it thus :— 

 " Segments of the trunk carinate. 



" Four anterior pairs of side-plates very long, narrow, towards the apex acuminate, 

 rio-id ; the fourth and fifth pairs prominent. 



