65 



The pleon is very strong featured, its basal portion being pro- 

 duced into prominent submedian bosses, and the terminal portion 

 also having two that are even more prominent, overhanging the 

 triangular telsonic portion, the apex of which is somewhat 

 trilobed and curves upward beyond two little notches. There) are 

 two tufts of setules on the underside of the apex^ and the medio- 

 lateral parts of the pleon are seltulose. The basal portion shows 

 four components^ the first marked by a sinuous dorsal line, the 

 next two only by lateral sutures, but the second, third, and fourth 

 segments are much broader than the first, and the second has a 

 more extensive lateral margin than thereat, and one which out- 

 flanks the side-plate of the seventh perseon segment- 



The eyes are dark, of irregular shape, tending to oval, with 

 about a hundred small components. 



The first antennse have the first joint much longer than the 

 second and third combined, the second much narrower than the 

 hrst, broader but considerably shorter than the third. The 

 flagellum of nineteen joints, carrying hyaline filaments, is shorter 

 than the peduncle. The second antennae are rather longer than 

 the first^ with the penultimate joint of the peduncle not shorter 

 than the ultimate, the fifteen-jointed flagellum subequal in length 

 and proximally in breadth to the peduncle. 



The epistome and upper lip, as seen in situ with the other 

 " oris partes," and as seen when detached, are shown in the 

 figures. The mandibles are particularly massive, with the palp 

 especially inconspicuous and membranaceous. The cutting edge 

 is very dark^ and looks like a single undivided tooth, very blunt. 

 The secondary plate on the left mandible is also dark-coloured, 

 simple but comparatively thin and small ; the crown of the molar 

 is light brown in colour, so prominent and so close to the 

 secondary plate tliat no spine-row could be perceived between 

 them. On the right mandible the secondary plate is divided into 

 slender teeth. 



The lower lip has the principal lobes quadrately rounded, 

 rather strongly spinulose, their inner margins indented, the innier 

 lobes pretty strongly developed. 



The first maxillse have th"e usual four plumose setse on the apex 

 of the inner plate^ these setae slightly increasing in length from 

 the outer to the innermost. On the outer plate nine horn- 

 coloured spines surmounted the apex ou one maxilla, and ten on 

 the other. 



The second maxillae have what I suppose to be the exopod very 

 distinctly represented by a rather long, narrow lobe of the outer 

 margin; of the three plates, the innermost has some plumose 

 spines mixed with the others, while on the middle and outer 

 plates there are to each about ten thin graduated spines. 



The maxillipeds have the plate arising from the second joint 

 more than twice as long as broad, with the greartest breadth 

 A1847. ^ 



