334 PROF. 0. CHILTON ON A NEW AMPHIPODAN 



from the base ou the lower margin, and one or two small setae placed more 

 distally ; the third joint is small and hardly diti'ers from the first segment of 

 the flagellum which is long, containing about 40 joints. 



The Lower antenna (fig. 3) is much shorter than the upper and has the 

 penultimate joint of the peduncle longer than any of the others and provided 

 with groups of spines on both upper and lower margins ; the last joint of the 

 peduncle is not much more than a third the length of the preceding one 

 and bears only two small setas at the distal end ; the flagellum is much 

 longer than the peduncle and contains about 25 joints. 



The upper Up (fig. 4) is of the normal form, with its free surface regularly 

 convex and bearing a few short setae. 



The mandible (fig. 5) differs very greatl3' from that of Dexamine or Para- 

 de.xamine, but appears to be similar to that of Gaernea coalita (Norman) as 

 described and figured by Delia Valle (189o, p. 570) : there is no palp, the 

 part corresponding to the cutting-edge is strongly chitinised but is destitute 

 of teeth and has the nuirgin quite entire. There is no ajjpearance of a spine- 

 row nor of a molar; there is a small rounded protuberance which may 

 possibly represent the accessory plate, but this has rounded entire margins 

 without any appearance of teeth. The right and left numdibles appear to be 

 similar. 



The loioer Up (fig. G) a^ipears to be similar to that of Gnernea, the inner 

 lobes being fairly well devclo[)ed and apparently somewhat irregularly lobed 

 at the extremities ; the principal lobes end in a small acute process which 

 seems to be thin and delicate, the outer margins are rounded and there are no 

 mandibular processes. 



In the Jirst maxilla (fig. 7) the inner lobe is small and bears two setse, the 

 outer lobe bears about a dozen strong spines most of which are more or less 

 dentate ; the palp consists of one joint only, fairly broad, appearing to have 

 the same shape in both maxilloe, and fringed with seta3 at the extremity and 

 along the distal portion of the inner margin. 



The second maxilla (fig. 8) has the inner lobe shorter antl narrower than 

 the outer, with seta3 along the greater part of its inner margin, but more 

 numerous towards the extremity. 



In the maxillipeds (fig. 9) the inner plate is small, rectangular, ending in 

 a few long setse. The outer plate is large but does not reach quite to the 

 end of the palp. Its inner margin bears numerous stout spines which 

 become longer towards the extremity and gradually pass into the more 

 slender setse on the extremity and distal portion of the outer margin; the 

 palp consists of four joints of the usual shape, the terminal one being quite 

 small but distinct. 



The first gnatliopods (Plate 27. fig. 10) have the basal joint long and 

 bearing numerous long setse near its anterior margin ; the carpus is fully 

 as long as the propod, widens distally and bears three distinct tufts of stout 



