REVISION OF L.M.B.C. AMPHIPODA. 427 



Head mucli curved, about as long as the two first per. 

 segs., lateral angle rounded. Eye round with large dark 

 brown centre. First coxal plate small oval, second 

 rounded at lower margin, which is minutely crenate ; 

 third less deeply crenate ; fourth and fifth entire or 

 smooth ; per. segs. increasing successively in length, the 

 last equal to the first pi. seg. PL segs. all somewhat 

 produced but rounded at the post, angle. Ant.^ in female 

 shorter than ant.^, fl. 7 — 8 jointed as long as ped. ; ant.^ 

 with last joint of ped. longer than preceding, a small tooth 

 on the lower margin of the distal end of second and third 

 joints; fl. slender 7 — 8 jointed shorter than ped. 



Gn.^ much smaller than gn.'^, first joint as long as the 

 next four combined, merus and carp, having the ends 

 truncate and setose the carp, prolonged to half the length 

 of the post, margin of the prop., anterior margin of prop, 

 slightly convex and not produced into a tooth. Dact. 

 serrate on the proximal two-thirds of its length the 

 serration- ending in a secondary tooth. 



Gn.* of the same general form as gn.^ but the carpal 

 process reaches almost to the post, angle of the palm ; 

 the anterior margin of the prop, is slightly concave. 



Prps. There is nothing distinctive about these. 



Up. First " aeque-attinent," {i.e., reaching as far back) 

 as the third, extremity of longest ramus of up.^ not quite 

 reaching to the end of ped. of up. 2. It is rare to find a 

 specimen which has not lost its third uropods. 



Telson concave forming a triangle of which the sides 

 are little longer than the base reaching about one-third of 

 the length of the ped. of up.^ 



This species is undoubtedly very near both to A. 

 marionis, Stebbing ("Challenger" Amphipoda, 1888), and 

 to A. hrunneus, Delia Valle (Gammarini, Fauna des 

 Golfes V. Neapel, 1894). From the former it differs in its 



