234 
HISTORY OF BRITISH CRUSTACEA. 
Sea-shore, very abundant. 
The species occur in moist places, under stones and slates. 
The female carries her eggs and even her young beneath the 
thorax ; the young have at first only six thoracic rings and 
six pairs of walking legs ; the seventh ring is rudimentary. 
These Crustacea seem to feed indifferently on vegetable and 
animal matters, and are themselves preyed on by birds. 
Gen. 118. ONISCUS , Latr. 
Outer antennae with the base concealed by the projecting 
front margin of the head ; these appendages are eight- 
jointed; the tail appendages are four-, the side ones two- 
jointed. 
Oniscus asellus, L. Land-Slater . — Body smooth, of a 
darkish-grey above, with two rows of yellow spots on the 
back, and on each side two rows of whitish spots ; the under 
side of the body whitish. 
Yery common in gardens and damp houses. 
Gen. 119. PHILOSCIA, Latr. 
Outer antennae exposed at the base, with eight joints. 
