216 



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 Cheloniscus 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. 



Heterodon, 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. 



H. diversidens. 



EuRYODON, 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 reticu- 

 latus has been applied, and which, therefore, I will at present omit. 



