AMPHIPODA. CHILTON. 47 



with several setae at the distal end, the third joint shorter 

 and slightly narrower, with setae at the apex and some along 1 

 one margin. The molar tubercle is fairly well developed 

 and is situated distally to the base of the palp, and there 

 are two small curved setules between it and the smooth cut- 

 ting edge. On the outer side of the mandible, nearly 

 opposite the molar tubercle, is a small rounded prominence 

 similar to that figured by Sars in Orchomenella ciliata, Sars, 

 and in other species. 



The lower lip has the rnandibular process well developed, 

 each lobe rounded distally and fringed with setae, appar- 

 ently small inner lobes more delicate than the outer lobes 

 are present, 



The first maxilla (Fig. 4 d) has the palp of two joints, 

 the first very short, the second appears narrow as shown in 

 Fig. 4 d, being seen in profile; when seen full-face it is 

 broad, with rounded end bearing numerous short setules. 

 The inner lobe is small and bears a single long seta at its 

 rounded apex, the outer lobe is straight and bears seven or 

 eight stout dentate setae. 



The second maxilla (Fig. 4 e) has the two lobes subequal. 

 the inner one bearing three long spinules at the apex and 

 fine setae along the inner margin, the outer has five or six 

 long dentate selules at the apex and finer ones near their 

 base. 



The maxillipeds (Fig. 4 /') have both lobes well developed, 

 the inner one with the inner margin straight and bearing 

 fine setules, and one stouter spinule at some distance from 

 the apex. The extremity is obliquely truncate and serrate, 

 the appearance being similar to that caused by a number 

 of short setae placed closely side by side. The outer lobe is 

 much larger, reaching fully as far as the end of the carpus, 

 its inner margin is finely crenulate or uneven, with curved 

 lines reaching up to each crenulation; the surface bears 

 three small spinules at some distance from the margin. In 

 the palp the proportions of the joints are shown in Fig. 4 /'. 

 The terminal joint is not finger-like, but forms a broad oval. 



The first gnathopod (Fig. 4 g and h) is very large and 

 is peculiarly bent and curved so that it is difficult to get a 

 view of the whole of it at the one time, the side plate is large, 

 rounded anteriorly, the basal joint is very long and bears 



