THE BARNACLES. 37k 
about in the places where they have taken up their residence. Under the 
bark of dead and decaying trees is a very favourite residince with the 
Woodlouse, anu in ‘such lo alities their dead skeletons may often be found, 
bleached to a porcelain-like whiteness. The colour of the Wuoulouse is a 
darkish leaden hue, sometimes spotted with white. 
‘The well-known PILL WsODLOuUSE, or PILL ARMADILLO, are seen at the 
upper part of the illus'rat-on, one representing the creatue as it appears 
while walking, and the other showing it when rolled up into a globular shape. 
In this attitude it bears a strong analogy to the common hedgehog, and a 
still stronger to the manis, as in the latter case the creature is defended by 
horny scales that protect it just as the external skeleton protects the 
armadillo. While roiled up, ‘his creature has been often mistaken for a bead 
ora berry from some tree, and in one instance a girl, new to the country, 
actually threided a number of these unfortunate crustaceans before 
she cliscovered that they were not beads. 
WE now come to the last inembers of the Crustacea, creatures which were for 
a long time placed among the molluscs, and whose true position has only been 
discovered in comparatively liter vears. Popularly they are cailed Barnacles, 
but are known to naturalists unuer the general term Cirrhipedes, on account 
Lepas anatifera. 
ee ue cirrhi, or bristles, with which their strangely transformed feet are 
ringed. 
When edult, all the Cirrhipcdes are affixed to some substance, be'ng either 
set directly upon it, as the common acorn barnacle. so plentiful on our 
coasts ; placed upon a footstalk of variable Jength, as in the ordinary goose-. 
mussel ; or even sunk into the supporting substance. as is the case with the 
whale barnacles. When young. the Cirrhipedes are free and able to swim 
about, and are of a shape so 'otallv different to that which they afterwards 
assume, that they would not be recognized except by a practised eye. 
Along the under surface are set six pairs of limbs not furnished with claws, 
but being developed at their extremities into two long filaments, joined and 
covered with hairs, By means of these modified limbs the cirrhipedes obtain 
