159 



truncate — sloping inwards. The end of each is supplied with from 

 12 to 16 long setse, nearly as long as the lobes themselves. These 

 setse curve inwards and have the inner margins supplied with short 

 pectinations which project at right angles to the sette. In the 

 outer seta? on each lobe the pectinations are tine and minute, but 

 in the inner setfe they are much stouter and I'ounded at the end. 

 There is a tutt of fine setie on the outer side of the basal portion, 

 at the point where the outer lobe articulates with it. The outer 

 lobe is slightly concave and overlaps and partially encloses the 

 middle lobe, which m its turn overlaps the lobe formed by tlie 

 prolongation of the basal portion. This appendage, like tlie first 

 maxilla is difficult of interpretation, but it appears probably, 

 according to the authorities already quoted, that the innermost 

 lobe represents the internal lacinia arising from the coxos, and the 

 two articulated lobes the internal lacinvje arising from the basos. 



The maxillipedes (Plate xxiv., figs. 2, 3, and 4) are large and 

 well developed and cover the greater part of the under surface of 

 the mouth parts. The basal joint (coxos) is well developed and 

 is distinctly marked off from the succeeding joint the basos. It is 

 br-oader than long, and from its outer distal margin arises a large 

 flat plate representing the epipodite. This tits closely on the 

 under surface of the head on each side covering and protecting 

 the other mouth parts ; it extends as far forwards as the mandibles. 

 In outline it is broadly elliptical, about half as long again as 

 broad ; the outer edge bears about eight short setie sparsely 

 arranged. The basos is more than twice as long as broad, rectan- 

 gular, inner margin quite straight, outer margin curving slightly 

 outwards towards the distal end. From the inner margin a flat 

 plate projects inwards at right angles to the stirface of the maxil- 

 lipede and this is produced distally a little beyond the end of the 

 inner side of the ischios. Only the distal end of this plate can be 

 seen when the maxillipede is viewed from below [i.e. from withotit) 

 but the whole can be readily seen if it is viewed from above {i.e. 

 from within), and the plate is bent back upon the rest of the 

 maxillipede. This view is shown in Plate xxiv., tig. 3. If the 

 plate were left in its natural position when the maxillipede is 

 viewed directly from above, only the inner edgeof the plate would 

 be seen. The end of this plate is truncate and thickly fringed 

 with stout setaj, some of them plumose, tlie inner surface is also 

 thickly covered with setae, some of them simple, but the others 

 along the margin long and densely plumose. Besides these seta? 

 there are on the outer edge of its distal portion three strong curved 

 setie hooked at the end. These appear to hook into the corres- 

 ponding seta? on the other .side, and to keep the two maxillipedes 

 closely together. 



From the outer distal angle of the basos (on its outer surface) 

 arise four very long setre directed inwards and reaching nearly to 

 the end of the plate already described. The ischios is very short, 



