REPOET ON THE AMPHIPODA. 607 



" MaxiUipeds robust ; plates more or less elongate ; last joint of the palp unguiform, 

 rarely tubercle -shaped or obsolete. 



" Body deep ; back thick, generally rounded ; very rarely carinate. 



" Side-plates deep, narrow. 



" Upper Antennse with the peduncle very short, thick ; the second and third joints 

 very small ; flagellum more or less elongate ; first joint more or less elongate, always 

 longer than the following joints, and on the inner side furnished with two brush-like 

 rows of setse. 



" Lower Antennse with the flagellum elongate in the male, shorter in the female. 



" First Gnathopods more or less elongate, generally with a small subchelate hand ; 

 rarely with the hand large or not subchelate. 



" Second Gnathopods elongate, filiform, with a small hand ; rarely without a nail. 



" Persejpods of the last three pairs successively longer ; the first joint posteriorly 

 laminar, dilated." 



In the new genus Soplii'osyne the maxillipeds are rather to be described as slender 

 than robust ; the epithet " narrow " is by no means universally applicable to the side- 

 plates in this family, the fourth pair generally, and sometimes others, being of consider- 

 able breadth ; occasionally the fourth perseopods are longer than the fifth. Amaryllis, 

 Haswell, is an aberrant genus in regard to the upper antenute. 



Genus Anonyx, Krdyer, 1838. 



For the original definition see Note on Kr0yer, 1838 (p. 178). Boeck in 1872 defines 

 the genus as follows : — • 



" Epistome helmet-shaped. 



" Mandibles with the palp fixed nearer the apex than the very prominent molar 

 tubercle. 



" First Maxillse with the inner plate ovate, small, furnished with two plumose setae 

 on the apex. 



" Second Maxillse with the plates broad and short ; the inner plate much shorter 

 than the outer. 



" Maxillipeds with the outer plate small, not reaching the distal end of the second 

 joint of the palp, nodulous on the inner margin ; palp robust ; last joint unguiform. 



" First Gnathopods more or less elongate, robust ; hand quadrangular, obliquel}- 

 truncate at the apex. 



" Telson longer than the peduncle of the last uropods. 



" Third Uropods with the branches longer than the peduncles, setose. 



" Body not deep. Side-plates not deep ; fourth not much excavate, not deeper than 

 broad. Postero-lateral angle of the third pleon-segment produced, upturned, acute." 



