542 The American Naturalist. [June, 
Upon the cranium. the dermal plates descend from the vertex 
to the snout in gradually narrowing series, being attached to the 
frontal protuberances, of which I shall presently speak. The 
extent of its attachment to the dorsal shield in the middle of the 
back varies; it would seem to be connected to the spinal meta- 
pophyses by a loose cuticular tissue, and posteriorily more inti- 
mately to the osseous pelvic shield beneath. oR 
There is no distinct pinna,—only a slight elevation of cartilage 
at the external meatus. The small, entirely black eye is scarcely 
visible, deeply covered as it is by the intermingling of the hairy 
fringe and mantle. The mamme are pectoral, two in number. 
The testes are abdominal. The entire length of the skeleton — 
from the tip of the snout to the pelvic shield varies very slightly — 
from five inches. 
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Fig? 1.—Chlamydophorus truncatus Harl. ; two-thirds natural size. 
The cervical region of the vertebral column presents the usual 
anchylosed condition of the centra of the second, third, and 
fourth vertebre, with the rudimentary development of the arches — 
and neural spines, commonly found in the Dasypodide. Ee 
metapophyses of the two last dorsal and three first lumbar verte- 
bræ are elongated for the attachment of the dermal coat. The 
sacral vertebræ are uniform in number and arrangement with the 
