ARMADILLO. 49] 



ISOPODA. ONISC/DJ?. 



NORMAL1A. 



Genus ARMADILLO. (Latreille.) * 



ARMADILLIDIUM. (Brandt.) 



Generic character. Elliptical, very convex. Outer antennae 

 seven-jointed. Coxse 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. 



THIS 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 antennae 

 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 Armadillo, which 

 has been generally adopted for these Crustaceans. 



