952 THE HOX. P. A. METHUEN ON 



antennules ; peduncle longer than flagellum, the ultimate and 

 penultimate joints well armed with numerous setfe which are 

 arranged, generally speaking, in succeeding and nearly parallel 

 semicrescents about all parts of the joints except the proximal 

 extremities ; on the other joints of the peduncle the setae re- 

 present a much diminished quantity ; the distal parts of the 

 flagellum joints carry about eight setse each, disposed in an un- 

 varying sequence. 



Lips : upper lip (PI. L. fig. 4) rounded, with some minute setse 

 about the extremity, at the centre of which they take an inward 

 course for a short way on each side. Lower lip (PI. L. fig. 3) : 

 inner lobes with minute setae on distal convex margins ; outer 

 lobes with longer setae ; mandibular process not elongate, bearing 

 small setae. 



Mandibles (PI. L. figs. 5 & 5 a) : palp leather long when com- 

 pared with the size of the mandible itself ; first joint shortest, 

 devoid of setae ; second joint rather broad and curved, the side 

 opposite the biting process markedly convex and armed with 

 two rows of setae (about fifteen in number) ; the ultimate joint is 

 about the same length as, or a little longer than, the penultimate 

 and is pi'ovided with tenninal setse on both lateral margins. Palp 

 on each side similar except that basal joints are of slightly 

 unequal lengths. Mandibles themselves of unequal size and of 

 slightly different structure (vide figs. 5, 5 a). 



Maxillida (PI. L. fig. 6) resembles that of Paracrangonyx com- 

 'pactus Chilton very closely. The first joint of the palp is short, 

 the terminal joint bears about nine bristles ; the endite of the 

 third joint of the maxillula is armed with seven stout serrated 

 bristles, which resemble those found in a similar position in 

 P. compacttiiS but difier in being more extensively serrated, and, 

 further, at the base of the innermost of these bristles is found a 

 group of fine hairs ; this endite is about double as broad as the 

 palp ; the endite of the first maxillula joint (accepting Hansen's 

 interpretation of the endites) appears to be exactly similar to 

 that of P. compactus, bearing two faii'ly long plumose setae and a 

 number of hairs on its inner margin. 



Maxilla (PI. L. fig. 7) : the endites are simple, regular, and 

 well-developed structures, both armed distally with a great number 

 of setae which are disposed in two rows, the more distal of these 

 rows being considerably longer than the rest, at any rate in the 

 case of the endite of the third joint ; the inner side of the endite 

 of the second joint bears a number of fine hairs, and between 

 these and the distal rows of setae lies one long plumose and another 

 smaller, slightly plumose seta. 



Maxilli^jed (PL L. fig. 8) : the shape of the joints like those of 

 Paracrangonyx cotnpactihs, the whole limb being, however, some- 

 what slenderer ; the seventh joint alone is shorter than that of 

 P. co'm'pactus ; a great number of closely-set setae and bristles 

 clothe the inner surface of the two endites and of the fifth, sixth, 

 and seventh joints. The basipoditic endite or inner plate carries 



