CRUSTACEA OF NEW ZEALAND. 223 



towards the extremity, which hears three stout setir at the end and one more slender 

 placed a slight distance from the end ; the three stout setae are finely serrate at the 

 ends (fig. 13). The middle lobe of the maxilla is broad, nearly as broad as long, the 

 extremity slightly oblique, bearing seven stout spiniform setae, of which the innermost 

 one is the largest and is a little separated from the others ; it is serrate on the inner 

 margin towards the extremity, on the surface of the lobe at its base are several fine 

 hairs ; the seta next to it is only about half as long and bears one strong tooth on the 

 inner margin, the remaining setae bear one or more denticulations or serrations, as shown 

 in fig. 12. The inner lobe is small and delicate; its extremity is rounded and bears one 

 or two finely plumose setae. 



A few very fine hairs are scattered over the surface of the whole maxilla. The 

 extremity of the palp appears to be the same both in the right and left mandibles, and 

 does not take different forms as in some species of Gammarus. 



Tlie second maxilla (figs. 11 & 15) is very similar to that of Niphargus. Its oiiter 

 lobe is slightly longer and broader than the inner, and bears at the extremity a great 

 number of slightly curved setae ; the inner lobe bears about six large setae, the innermost 

 one of which is much the largest, and is situated a little distance from the extremity on 

 the inner margin, the basal portion of it is sparingly plumose, and its extremity is 

 plumose or almost dentate on one side. Some of the remaining seta? are similar to this 

 one, but others appear to want the plumes at the end (fig. 15). 



A few fine hairs are sparingly scattered over the whole surface of the maxilla. 



The maxillipedes (figs. 16, 17, 18) do not present any remarkable feature. The lobe 

 attached to the bases (" inner lobe ") is rectangular, the extremity truncate and bearing 

 about four stout setae much curved inwards; there are two fine setae on the inner 

 margin and a few fine hairs on the surface towards the outer margin (fig. 17) ; the 

 lobe attached to the ischium reaches nearly as far as the extremity of the outer margin 

 of the next joint, the meros, its inner margin is nearly straight and bears about ten to 

 twelve setae, of which two near the extremity are pretty stout, the others being rather 

 slender ; besides these spiniform setae there are a few finer setae or hairs along the inner 

 margin (fig. 18). 



Wlien seen from below, the basos bears no setae on its outer margin, but there are three 

 at the extremity near the inner angle ; there are three or four setaj on the inner margin 

 of the ischium and one at the extremity of the inner margin of the meros ; the last- 

 mentioned two joints have no setae on their outer margins. The carpus has the outer 

 margin much curved, with a single seta at the extremity, its inner margin is curved and 

 thickly fringed with long seta?; on the upper surface of this joint there is a distinct row 

 of six setie running parallel to the inner margin near the extremity. The propodos has 

 the outer margin very convex, and produced on the upper surface into a small lobe at 

 the base of the dactylos ; on the upper surface (fig. 17) towards the end of the joint 

 is a dense mass of long setae, arranged chiefly in three longitudinal rows ; the inner 

 margin has the basal portion free from setae, but the distal half thickly fringed with long 

 setae ; on the under surface of the propodos there are two or three long setaj at the base 

 of the dactylos. The dactylos is as long as the propodos, and is very acutely pointed ; on 



