Zoological Society. 359 



much reduced ; maxillary bone articulated posteriorly by suture to 

 the palatine ; teeth numerous and minute ; infra-orbital canal long, 

 commencing below the malar process, and terminating nearly on the 

 middle of the bone ; malar bone forming simply a portion of an in- 

 verted arch, round, and devoid of processes ; palatine bone ascending 

 into the orbit ; pterygoid bone strongly developed, with an angular 

 termination ; zygoma rather small, the glenoid surface lengthened, 

 the lower part of the squam.ous and the aUsphenoid bone forming a 

 longitudinal swelling within it ; tj-mpanic bone small, and loose ; 

 mastoid bone broad, forming the sides of the occiput which are 

 rounded ; lower jaw thin and compressed, condyle longitudinal, but 

 little elevated ; coronoid process much reduced. 

 P. gigas. 



ToLYPErxES, lUiger. 



Head broad behind, ears wide apart ; plates very closely articulated 

 to each other, their surface divided by impressed marks, and studded 

 with blunt tubercles, those of the scapular and pelvic shields varying 

 from a square to a pentagonal or hexagonal form ; bands three, com- 

 posed of oblong parallelograms, equally subcircular, and closely arti- 

 culated ; fore-feet four-toed, the outer being absent ; the medius 

 slightly longer than the index, with a much larger claw, both having 

 an outward twist ; maxillary bone articulated posteriorly to the pala- 

 tine, its malar process standing suddenly outwards, compressed ; infra- 

 orbital canal commencing below and behind its root, rather lengthened, 

 rising a little in its course ; teeth rather large ; malar bone slender, 

 and simply abutting by an oblique suture against the zygoma ; pala- 

 tine bone ascending into the orbit, pterygoids with blunt hamular 

 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. TRICINCTCS. 



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. ffiganteum. 



m 



Heterodon, Lund. 



Distinguished by the unequal sizes of the teeth : the fragment of 



