AMPfllPOl) GENlfS LEPTOCHEiRUS. 58l 



finely dentate (fig. 9) ; the outer margin is covered Avith fine 

 hairs. The 2nd joint of the palj? is expanded apically, and 

 rounded, with a marginal row of 4 strong flat spines, and 3 

 plumose setfe ; 2 or 3 diagonal rows of setae are inset sub- 

 marginally. 



Maxilla 2 (fig. 10). — Outer ^j^rtfe the larger, covered with 

 exceedingly fine long hairs ; expanded distally, bulging behind, 

 furnished with an apical cluster of stifl' bristles, and a row of 

 sparsely plumose setae extending some distance down the inner 

 margin. The inner plate, distally narrowed, is pi'ovided with 2 

 rows of sette ; one row, submarginal, consists of 20 long, delicate, 

 finely plumose setae ; the second row contains an apical cluster of 

 stifli" seta3, with 8 inset along the margin, these latter of the same 

 structure as the plumose ones of the outer plate. In Grube's 

 specimen the upper portion of the inner plate has been torn 

 away ; the 2 apical setae represented in the figure 2 m^ are two 

 of the plumose row of the outer plate. 



Maxillipeds (figs. 11 & 12). — Inner and outer joZafes well de- 

 veloped, but narrow. The apices of the inner plates are inset 

 with 4 long, feathered, setiform spines along the margin, with 

 a group at the inner angle of 4 long delicate plumose setas 

 set together in a little hollow, 3 similar ones extending down 

 the inner margin, and 2 submarginally on the outer side. The 

 outer surface is longitudinally ridged. On this surface close to, 

 but just below, the inner angle, is a small cotipling -spine (fig. 12), 

 stout, and bent upwards. It appears to be tuberculated on its 

 inner side, but the detail is obscure, even with a y^^th oil-immersion 

 lens. The outer plate carries a marginal row of flat feathered 

 spines (15 in Grube's large specimen, 13 in Chevreux's, 7 in the 

 smallest of all), the 2 apical ones much the longest, and sub- 

 marginally on the outer side a few long feathered setae. The 

 2nd joint of the palp is the longest, in Grube's specimen twice 

 the length of the 1st, furnished with numei-ous plumose setae ; 

 the 3rd is produced over the insertion of the finger as in the type 

 species ; finger small, obtuse, cai-rying apically 1 long stout 

 dentate spine, 1 smaller one, and 2 setae in Chevreux's specimen, 

 3 stout spines and 4 setae in Grube's, 1 spine and 2 setae in 

 Norman's. 



Fii-st Gnathopods (figs. 13, 15, 17, ifc 18). — 2nd joint narrow at 

 the base, but widening distally ; posterior margin convex, with 

 2-4 very long delicate setae inset midway ; antei'ior margin 

 straight, carrying a row of delicate plumose setfie, another row of 

 longer similar setae is found on the under surface as in the type 

 species ; 3rd joint bulging behind, fringed with numerous closely 

 set long feathered setae ; 4th joint the smallest, also fringed 

 posteriorly with feathered setae shorter than those of the 3rd, 

 The 5th is considerably longer than the 6th, with 5-7 transverse 

 I'ows of plumose setae, and 5-7 clusters of rigid serrate bristles 

 along the hind margin. 6th oblong, about twice as long as broad, 

 with 4-5 transverse rows of setse on the hind margin ; palm short, 



