vIn VERTEBRAE AND RIBS 175 
varies; two to four may be thus united. The additional 
articular facets upon the dorsal vertebrae have been already 
commented upon as a point of important likeness to other 
American Edentates. The dorsal vertebrae are commonly eleven 
in number, the lumbar being three. But in Priodon the numbers 
are twelve and two respectively. There are traces to be observed 
of the double-headed attachment of the ribs to the sternum. The 
Fria. 100.—Bones of the right Fic. 101.—Bones of the manus of 
manus of the Hairy Armadillo. the Great Armadillo. Priodon 
Dasypus villosus. x 3. Gs giganteus. x4. a, An acces- 
Cuneiform ; /, lunar ; m, mag- sory carpal ossicle in front of 
num ; p, pisiform ; £&, radius ; the pisiform, which is not seen 
s, seaphoid ; ¢d, trapezoid ; tm, in the figure. Other letters as 
trapezium ; wv, unciform; U, in Fig. 100. (From Flower’s 
ulna; J-V, digits. (From Osteology.) 
Flower’s Osteology.) 
shoulder girdle of the Armadillos is somewhat diverse in form in 
different genera; the acromion is always large, and is remark- 
able in Priodon for the fact that the humerus also articulates 
with it, its extremity. being recurved, and forming a socket for 
this purpose. As in some other Edentates there is a second 
spine on the scapula behind the first. The clavicle is strong. 
There is some variation in the form of the manus. It is five- 
fingered in Dasypus; in Tolypeutes the first digit has vanished ; 
on the other hand, in Priodon, the fifth has become rudimentary 
