882 THE VOYAGE OF H.M.S. CHALLENGER. 



rostrum to the extremity of the third uropods, was four-fifths of an inch. In Den norske 

 Nordhavs-Expedition, p. 167, Sars says, " Length of the largest of the specimens collected 

 about 40 mm., for an Amphipod a truly imposing size." 



Locality. — Station 49, south of Halifax, Nova Scotia, May 20, 1873 ; lat. 43° 3' N., 

 long. G3 J 39' W.; depth, 85 fathoms; bottom, gravel, stones; bottom temperature, 35°. 

 Three specimens. Dredged. 



Remark*. — This species I at first named Epimeria conspicua, though with some 

 doubt as to its distinctness from the species Epimeria loricata, of which G. 0. Sars 

 had given a preliminary description. The further description and admirable figure 

 since given by Sars of his species show clearly that Epimeria conspicua must rank as a 

 synonym. Of this indeed I had earlier become aware, as upon my application to Mr. 

 Sidney Irving Smith for specimens of Epimeria loricata, he with his accustomed 

 kindness sent me specimens from lat. 38° 37' 30" N., long. 73° 11' 0" W., which 

 agree too minutely with the Challenger specimen to admit any question of specific 

 distinctness. Two of these specimens were considerably larger than the largest Challenger 

 specimen, and retained, and still retain, traces of bright red colouring, of which the 

 Challenger specimens show not a vestige. Sars says " Colour a gorgeous red," and 

 again, " Colour a magnificent coral-red, a trifle more vivid on the posterior margin of 

 each segment." 



In Boeck's definition of Epimeria, the character " Pedes saltatorii ultimi paris ramis 

 perangustis " is not appropriate to the present species. 



Family Iphimedida 



In 1870 Boeck made the Iphimedinse the eleventh subfamily of the Gammaridae, 

 placing in it the genera Vertumnus, Ipliimedia, Odius, and Laphystius; in his later 

 work he made it the seventh subfamily of the Leucothoidae, with the same genera, but 

 substituting the name Acanthonotozoma for the preoccupied Vertumnus, and in the table 

 of errata reading Lafystius in place of Laphystius; in the body of the work the 

 Iphimedinae appear as the fifth subfamily of the Gammaridae, but the editor explains 

 (p. iv.) that this was due to a wrong arrangement of the manuscript, being contrary to 

 the scheme of classification given on page 74. As already noted, Sars in 1882 placed 

 the genera assigned by Boeck to the Iphimedinaj in the family Epimeridae. The 

 characters most open to observation certainly unite the two groups very closely, but on 

 the other hand they are rather sharply distinguished by the mandibles and maxibipeds. 

 I rely upon Boeck's definition of the Iphimedinae as being almost equally applicable to 

 the new family Iphimgdidse, which is new chiefly in the form of the name ; the definition 

 is as follows : — 



