REPORT ON THE AMPHIPODA. 1559 



Eyes occupying nearly all the surface of the head, except a strip round the hind 

 margin which projects into an angle at the centre. The thin front margin is also 

 unoccupied at the centre. 



I pper Antenna} (of the female) small, projecting from the under surface of the head, 

 at some distance from the front. The first joint is about twice as long as the second ; 

 the first joint of the fiagellum is tapering, longer than the peduncle, fringed with 

 filaments ; the second joint is about a third of the length of the first, and much narrower, 

 not even at the base so broad as the distal end of the preceding joint ; the terminal joint 

 is almost linear, more than half as long as the preceding. 



Upper Antenna? (of the male), fig. a.s.B. First joint of the peduncle distally 

 widened, as broad as long, the second joint incompletely developed ; first joint of the 

 fiagellum large, the strongly convex lower side covered with a thick brush of long 

 filaments ; the second joint attached at the upper end of the rounded apex of the first, 

 much wider than the third joint, and as long as the third and fourth together, its upper 

 margin fringed with filaments ; the fourth joint shorter and much narrower than the 

 third. 



Lower Antenna? wantiug in the female; in the male (fig. a.i.B) not longer than the 

 upper antennae; the second joint to some extent free from the wall of the head; the 

 third joint subequal in length to the fourth, its margins smooth ; the fourth joint 

 forming an angle with the third and another with the fifth, as if partially adapted for 

 folding, but these three joints are not elongated or linear ; the fourth and fifth joints 

 have short filaments along the straight margin ; the fiagellum consists of a single joint, 

 shorter and narrower than the preceding joint, with short filaments at the blunt apex 

 and at two points of one margin. It may be questioned whether these antennae are 

 the fully developed form, but the probability is that they are, since they are found in a 

 specimen which has the upper antennas and the mandibular palp of an adult male. 



Epistome deep and broad, helmet-shaped, its lower margin forming a triangle over 

 the upper edges of the trunks of the mandibles, the apex of the triangle occupied by the 

 small Upper Lip over the cutting edges of the mandibles. 



Mandibles. — The part of the trunk in front of the palp is narrow, the cutting edge 

 narrow, with a small prominence at the upper angle ; the palp is placed on a projection 

 of the upper margin, its first joint much broader than the second or third, but not so 

 long as those two together ; the second joint shorter than the third ; the third joint 

 curved, apically almost acute. 



The Maxilla? appear to be smooth-rimmed oval plates, the first pah' much larger than 

 the second, and coalesced along the centre except distally, while those of the second pair 

 are free from one another. 



Maxillipeds short and broad ; the inner plate with convex sides, and two little 

 embedded spinules close together at the centre of the slightly emarginate distal border ; 



