EURYSTHEUS ERYTHROPHTHALMUS. 355 



are rather more than half the lengtli of the animal, and 

 are placed at the extreme front of the head ; the first 

 joint of the peduncle is as long as the head, and more 

 stout than the second and third, but not quite so long ; 

 the flagellum is about half the length of the peduncle ; 

 and the secondary appendage is rather more than half 

 that of the primary. The inferior antennae are a little 

 shorter than the superior ; the peduncle reaching nearly 

 as far as the peduncle of the superior. The first pair of 

 legs have the hand small, with the palm oblique. The 

 second pair have the wrist as long as, and continuous* 

 with the hand, the inferior margin of which is furnished 

 with several fasciculi of hairs ; the palm is concave, very 

 oblique, and armed with three short points or teeth 

 (that is, two equidistant from each other, and from the 

 third, which defines the limit of the palm). The other 

 legs are nearly of equal length, and are rather long and 

 slender, they increase a little posteriorly, and the last 

 three pairs have the coxae less deep than the first four ; the 

 thighs are much dilated, and the distal extremity of the 

 penultimate joints posteriorly tipped with a small bundle 

 of long hairs. The caudal appendages are uniform, and 

 nearly of the same length, the penultimate pair being 

 rather the shortest ; they are biramous, the peduncle 

 carrying at the extremity a strong spine, and the 

 branches having the posterior surface furnished with 

 short stiff spines ; the central caudal termination is 

 cylindrical, tipped with a solitary hair. 



This interesting form of Amphipod (of which we feel 

 some doubt as to the present being its most natural 

 position, relative to the other animals of the order) has 



* By the expression that the wrist is "continuous"' with the hand, we 

 mean that the outline of the former is in close continuation with that of the 

 latter, so that they appear as a single joint. 



A A 2 



