238 
HISTORY OP BRITISH CRUSTACEA. 
domen fill up the notch between the two last rings, and do 
not extend beyond the edge. When touched, they have the 
power of rolling themselves into a ball. 
Gen. 121. ARMADILLO, Latr. 
Latreille gave this name to these creatures from their 
habit, when disturbed or alarmed, of rolling themselves into 
a ball, like the curious, jointed, mailed mammalia of South 
America commonly so called. In some places they are 
called “ pill-beetles,” the former part of the name derived 
from their appearance when rolled up being that of a pill. 
The last false feet have the basilar joint very large, and almost 
entirely filling up the notch between the fifth and sixth seg- 
ment of abdomen. The body is highly convex above, and 
very blunt at both extremities. The outer antennae are seven- 
jointed, inserted in a hollow of the front ; the lateral caudal 
appendages do not project ; the apical joint triangular. 
Armadillo vulgaris. Till Beetle . — Body smooth, of a 
greyish-brown hue, with the hind margin of the rings of a 
yellowish hue. 
Not uncommon in different parts of the country. 
The next sub-order of the Isopoda contains those species 
which can swim; the abdomen ends in a large fin, furnished. 
