ARMADILLO. 49] 
ISOPODA. ONISCID. 
NORMALIA, 
Genus—ARMADILLO. (Latreille.) * 
ARMADILLIDIUM. (Brandt.) 
Generic character. Elliptical, very convex. Outer antenne 
seven-jointed. Coxe of the first and sixth segments of the 
pleon obsolete. Uropoda with the basal portion flattened, trun- 
cate; terminal portion broader than long, not extending beyond 
the extremity of the pleon, with which its apical margin forms 
a continuous line: accessory filament flattened, club-shaped, 
concealed. 
Tus genus forms a distinct section of the family on 
account of the structure of the last pair of the appen- 
dages of the tail, which do not extend beyond the 
extremity of that part of the body, their truncated 
extremity forming a continuous line with the lateral 
margin of the fifth segment of the tail, and the extremity 
of the sixth joint. 
“The eyes are supported on the cephalic segment 
alone. The margin of this is raised, forming an angular 
projection in the middle of the forehead, passing back 
from whence, as it forms the orbital margin, to the entire 
exclusion of the third segment, the lateral lobes being 
here remarkably small, and derived entirely from the 
cephalic segment.”—Kinahan. 
The animals, when alarmed, have the habit of rolling 
their bodies into a perfect globular mass, the antenne 
being completely concealed, for which purpose the front 
margin of the head is provided with a groove on each 
side, within which the basal joints of the outer pair of 
these organs are lodged (fig. A). 
* The Mammalians thus popularly named being generically known under 
the name of Dasypus, we have retained Latreille’s name of A ymadillo, which 
has been generally adopted for these Crustaceans. 
