ONISCIDiE. 441 



species belonging to this family are figured ; but this 

 writer carried the creation of species^ not only of these 

 animals, but also of the Acaridte, to an undesirable ex- 

 tent ; every slight variation of colour being regarded as 

 of specific value. It is very probable that when greater 

 attention shall have been devoted to these creatures in 

 this country, other species will have to be added to our 

 native lists than are described in the following pages. 

 This family is divisible into two sub-families — 



1. The Ligiince, having the flagellum of the outer 

 antenuEG multiarticulate, and the terminal pair of caudal 

 appendages with the basal joints greatly elongated, and 

 terminated by two long and slender subequal rami ; 

 consisting of the genera Ligia (sub-marine species), and 

 Ligidium, composed of a single European species, found 

 in damp moss. 



2. The Oniscina, having the flagellum of the outer 

 antennae not multiarticulate, and the terminal pair of 

 pleopoda with the basal joints very short, and furnished 

 with two short flattened unequal rami, of which the 

 inner is sometimes nearly obsolete, comprising the 

 remainder of the species. 



