18 T. V. IIOPCSOX. 



The first segment ot the iiicsusoinc is a little longer than the next two, au<l about 

 as long as the last; it partially eneloses the j-ephalosonie up to the level of the eyes, 

 but owing to foreshortening this is not noticeable in the figure. Its epimera are not 

 distinctly separated otf from it, and they are pointed posteriorly. The fifth and sixth 

 segments arc longest and widest. The epimera of all but the fii-st are distinct, their 

 external margins are curved, and they are pointed posteriorly. The entire mesosome 

 is covered irregularly with minute punctures, not readily seen while the body is wet. 

 The metasorae is a little narrower, and only five distinct segments arc vi.sible from the 

 dorsum, the sixth being fused with the telson, which is rather short and broad, its 

 margins slightly curved to a blunt point, the structure being strengthened by a 

 poorly-developed median keel. The margin is finely serrated, and each " tooth " 

 of the serration is accompanied by a spine ; the whole border is fringed with small 

 plumose setae. 



The uropoda are large, and project but little beyond the telson. The protopodite 

 is short and stout, having its inner border prolonged in a scythe-like manner as far as 

 the inner angle of the endopodite. The cxopodite is narrow, lanceolate, both sides of 

 the distid half bear stout spines at regular intervals, and there is one at the extremity ; 

 almost the entire margin is fringed with short plumose seta;. 



The endopodite is broader, more leaf-like in shape ; it projects to the same 

 distance. The internal margin is serrated, each serration being accompanied bv a 

 small but stout spine. These latter are also to be found on the inner margin. .\11 the 

 outer and most of the inner part is fringed with long plumose seta>. 



The first antenna has a peduncle of three joints, none of which arc dilated ; the 

 first is stout and lies at a right angle to the axis of the body, the second joint is 

 shorter, and the third, which is comparatively slender, is thrcc-(juarters of the length 

 of the preceding two together. The iiagellum is multi-articulate and not very long. 



The second antenna has a peduncle of five joints ; the fii-st is very .short and 

 .stout, the second is .shorter, the other three progressively increase in length, the last 

 being .scarcely as long as the two preceding ones. The fiagellum is multi-articulate 

 and half as long again as the peduncle. 



The mandible is stout. The mandibular palp is three-jointed ; the middle 

 joint is the longest, and tlie terminal one the shortest. The inner border of 

 the second joint bears a group of setiu near its distal extremity. The.se setiu 

 are very finely toothed along the distal halves or thereabouts. The distal joint 

 has the external margin rounded ; it is fringed with stiff setiv on its straight inner 

 border. These gradually increase in length towards the extremity of the joint, and 

 under a high power they are seen to be Hattened and slightly expanded at their 

 extremities. At the extremity of the joint are three or four verv mucli longer .setaj 

 armed with deliaite teeth, as on the preceding joint. 



The second maxilla (fig. 2) is a single elongated joint, rather expanded at the 

 base; its inner margin is straight, and at about Iwn-thirds of its length there is a 



