. 





the 'Challenger ' Amphipoda. 205 



gradually attains its greatest development in the great laminar 

 backward-directed processes on the first three segments of the 

 pleon. The subdorsal carinas are formed by single tubercles 

 on either side of the pereion-segments, while on the first 

 three pleon-segments the main tubercle is attended by a group 

 of smaller ones. The lower hinder angles of the pereion- 

 segments are rounded, produced backwards, and are a. little 

 prominent, thus forming a sort of lateral carinas, which are 

 continued by pointed tubercles on the first three pleon-seg- 

 ments. These last-mentioned segments also have their 

 lower hinder angles produced into sharp points. The second 

 pleon-segment has also a produced point at the basal end of 

 the lower margin. The last two joints of the peduncle of the 

 lower antennae are unequal in length. The pereiopoda have 

 small spines. In other respects the creature resembles the 

 larger and more northern species, Epimeria loricata, G. O. 

 Sars, so far as that is described, and may possibly be only a 



variety of it. 



Acanthozone tricarinata, n. sp. 



Head almost concealed; antennae with some of the pe- 

 duncle-joints variously dentate. A large triple carina the 

 whole length of the pereion, formed by long outstanding pro- 

 cesses. On the first segment the central process is double, 

 one branch extending forwards. The segments have also the 

 hinder margin transversely carinate. The first two epimera 

 are simple, acuminate below ; the five that follow have large 

 processes above similar to those on the segments. The third 

 and fourth epimera curve backwards below to a sharp point ; 

 the fifth and sixth are rounded at this part, but have an angle 

 below on the front margin. 



The central carina is continued with processes of various 

 sizes along the pleon, the lateral carinas being also more or 

 less represented. 



The last three pereiopoda have the first joint with its hinder 

 margin carinate, not produced into an angle above, as in 

 Acanthozone cusptdata, Lepechin, but produced downwards 

 in a rounded lobe over the second joint ; the third and fourth 

 joints have the lower hinder angle much and sharply pro- 

 duced downwards. 



Subfamily Gammarixje. 



Amathillopsis australis, n. sp. 



A median carina runs from the head to the telson. Only 

 the last three segments of the pereion and the first three of the 

 pleon have the carina produced into a spine. Of the epimeral 



