P 'eracarida—1 sopoda . 
43 
includes the species of Iclotea common on the British coasts, one Table- 
of which is shown in a coloured drawing hung in Wall-case No. 6. No- 6 * 
The family Arcturidcce are remarkable for the long and sub- 
cylindrical body, very unlike that of the ordinary Isopods, and 
also for the great size of the antennae, on which the young cluster 
as in the specimen of Arcturus baffini (Fig. 25) exhibited here. 
The Sub-order Oniscoidea comprises the familar “ Woodlice ” 
Fig. 24. 
Piece of timber from Hyde pier, showing damage caused by Limnoria and 
Chelura. [Wall-case No. 4.] 
or “ Slaters ” so common in gardens. They are terrestrial animals 
adapted for breathing air, and sometimes having, in the abdominal 
limbs, tufted air-tubes like the “tracheae” of insects, which serve 
as respiratory organs. The terminal limbs of the abdomen are 
slender or minute, and the antennules are always small. The 
large “ Sea-slater,” Ligia oceanica, which is always found near the 
sea and sometimes actually in rock pools, is intermediate in many 
points of structure, as it is in habits, between the exclusively 
