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processes, a little bent outwards; zygoma rather narrowed, glenoid 
surface flat, reniform ; tympanic bone reduced to an annular form ; 
lower jaw slender, condyle moderately elevated, reniform, coronoid 
process elevated. 
T. TRICINCTUS. 
Cuvier cites the Cheloniseus of Fabricius Columna as being this 
species, but represented with four bands instead of three; the last 
row of plates of the scapular shield is composed of oblong parallelo- 
grams like those of the bands, which may have given rise to such 
an error. 
CHLAMYDOTHERIUM, Lund. 
Judging by the plates that accompany Dr. Lund’s Memoir, this 
appears to be a genus of extinct gigantic Armadilloes, having the body 
provided with moveable bands like the recent ones, and teeth of a 
compressed form, and irregularly fluted; two species are distin- 
guished. 
C. Humboldtii. C. giganteum. 
Hereropon, Lund. 
Distinguished by the unequal sizes of the teeth: the fragment of 
the lower jaw figured contains six teeth, of which two are much larger 
than the others. 
Hi. diversidens. 
Evuryopon, Lund. 
Dr. Lund figures a tooth resembling those of the Armadilloes, but 
apparently broader in proportion to its antero-posterior diameter. 
E.. latidens. 
GLYPTODON, Owen. 
Carapace ovoid, without distinction of shields or bands, composed 
of small hexagonal pieces with sculptured surfaces ; teeth divided into 
narrow transverse lobes ; malar bone with a lengthened descending 
process, placed transversely ; zygoma flat, its glenoid surface elevated, 
transversely elongate, looking a little backwards; mastoid propor- 
tionally small, placed laterally. 
G. CLAVIPES. 
The central tubercle upon each ossicle large, round, or subhexagonal, 
conspicuous above the surrounding ones, which are small, and more 
cut up by reticulate depressions. 
G. ORNATUS. 
The central tubercle of each ossicle not conspicuously marked above 
the rest ; all more finely granular. 
This may possibly be the young of that to which the name retieu- 
latus has been applied, and which, therefore, I will at present omit. 
