REPORT ON THE AMPHIPODA. 1093 



flagellum on the upper antennas, while the similarity iu shape between the first and 

 second gnathopods is, to say the least, too slight and vague to be worth insisting on ; the 

 new species, Gammaropsis afra, has the outer ramus of the third uropods a little longer, 

 instead of a little shorter, than the inner. 



To complete Boeck's view of this group, I give his definition of KrOyer's Protomedeia, 

 which is as follows : — 



" Second Gnathopods stronger than the First and in the male more robust than in the 

 female. 



" TJiird Uropods with the inner ramus shorter than the outer. 



" First and Second Peraeop>ods with the finger tolerably elongate. 



"" In other respects almost as in the genus Microdeutopus." 



Gammaropsis exsertipes, n. sp. (PI. CXIL). 



Rostrum little developed, lateral lobes of the head narrow, acute ; postero-lateral 

 ingles of the first three pleon-segments rounded. 



Eyes small, nearly round, situated on the lateral lobes of the head, retaining a little 

 colour in spirits. 



Upper AntennsB. — First joint as long as the head, moderately thick, with several 

 setiform spines on the lower margin and upper apex, and a stouter short spine at the 

 lower apex ; the second joint thinner but much longer than the first, the lower margin 

 fringed with many slender curved spines, the longest at the distal end ; the third joint 

 intermediate in length between the first and second, fringed like the second ; the flagellum 

 of seventeen unequal joints, together not as long as the peduncle, the first the longest, all 

 carrying slender spines, and most of them cylinders, the terminal joint tipped with some 

 setae and a short stiff spine ; the secondary flagellum of four very slender joints, together 

 not quite equalling in length the first three of the primary. 



Lower Antennas not quite so long as the upper ; the first two joints short, set far back 

 on the underside of the head, the gland-cone narrow, decurrent ; the third joint longer 

 than the preceding two united, widening a little distally, with slender spines on the margin, 

 and a short stiff spine at the lower apex ; the fourth joint prismatic rather than cylin- 

 drical, nearly as long as the second of the upper antennae, and with similar spines ; the 

 fifth joint a little shorter than the fourth, similar ; the flagellum of twelve unequal joints, 

 the first the longest, the spines of the various joints and the terminal armature much as 

 iu the upper antennae. 



Upper Lip rather unsymmetrically bilobed. 



Mandibles. — The cutting edge with four large teeth and probably two small ones ; 

 the secondary plate of the left mandible (figured on the right hand of the Plate) with 

 four strong teeth ; the secondary plate of the right mandible apically bifid, its upper or 



