352 A HISTORY OF EECENT CRUSTACEA 



Edwards, and Nerocila serra, Schiodte and Meinert, 

 in general appearance somewhat approach the next family, 

 the Serolidas, but this is still more the case with Nerocila 

 Loveni, Bovallius, 1887 (see Plate XV.), from the coast of 

 Java, in which the side-plates of the perason-segments ' are 

 very long, extremely produced, flattened in the form of 

 sabres or flat horns, very sharp ; ' those of the seventh 

 segment reaching nearly to the end of the peduncles of 

 the uropods. The New England species, Nerocila munda, 

 Harger, is not mentioned by Schiodte and Meinert. 



Livoneca, Leach, 1818, contains twelve species. The 

 head, which is large in the young, is much smaller in the 

 adult male, and generally of moderate size in the adult 

 female. The eyes suffer less diminution with advancing 

 age than in the preceding genus, with which in regard to 

 the mouth-organs it is in near agreement. Whereas in 

 the arrangement by Schiodte and Meinert these two genera 

 are widely separated, Hansen regards them as closely 

 connected, and both very near to Rocinela, a genus of the 

 ^Egidge. Livoneca Redmanni, Leach, is a variable species, 

 widely distributed on the east coast of North and South 

 America ; Livoneca ovalis (Say) is perhaps a synonym of 

 it. As in other species of this genus the adults are 

 usually twisted to one side. 



Anilocra, Leach, 1818, contains sixteen species, one of 

 which excels in size all others of the family, this being 

 Anilocra gigantea (Herklots), for which Herklots instituted 

 the genus Epichthys, but without assigning any distin- 

 guishing character of any importance except the gigantic 

 size. The length of three inches and a half, though 

 striking even in this family of large Isopods, is not a 

 character of generic value. It is remarked, however, that 

 the young of this species is very different from the young 

 of neighbouring species, even of those most nearly allied 

 in the adult forms. Anilocra asilus (Linn.), recorded by 

 the Rev. A. M. Norman from Herm, is interesting, not 

 merely as being hitherto the only British representative of 

 the family, but as being the ancient Pediculus marinus of 

 Eondelet and Gesner. 



