DASTPODID^. 135 



ceding specimen ; from the Pleistocene of Uruguay. The 

 scutes are nearly smooth, their central disks being mainly 

 defined by a circle of hair-pits, and the peripheral ones 

 scarcely differentiated. The scutes form oblong hexagons, 

 and in this respect, as well as in the absence of rugosity, 

 agree with those of H. ornatus and differ from those of 

 Glyptodon. Their longer diameter is 0,052, and their 

 thickness 0,031. 



Presented by D. A. Stoddart, Esq., 1865. 



Family DASYPODID^. 



The teeth in the existing genera are simply conical ; the facial 

 portion of the skull is elongated, and there is no descending max- 

 illary process in the zygoma. The carapace always contains a certain 

 number of movable bands, and may be entirely made up of such ; 

 the scapular and pelvic bucklers, when present, consist of polygonal 

 articulated scutes, while the scutes of the movable bands overlap 

 and are quadrangular. There is a cephalic, but no ventral shield ; 

 the tail is either completely cased in bone, or bears a certain number 

 of bony tubercles. The cervical vertebrae have extremely short, broad, 

 and depressed centra ; the atlas is free, but the second, third, and fre- 

 quently some of the other vertebrae are anchylosed by their centra. 

 The humerus has an entepicondylar foramen, the femur a third tro- 

 chanter, and the tibia is always anchylosed distally with the fi.bula ; 

 while the fore feet have long, curved claws. The cerebrum is of 

 relatively large size. 



Genus CHLAMYDOTHERIUM, Lund \ 

 Syn. Pampatherium, Amegliino -. 



This genus connects the Dasypodidce with the Ghjptodontidcei 

 having the carapace of the former, while the dentition is stated to 

 approach that of the latter ^ 



There are nine lower teeth. The carapace has several movable 

 bands, composed of large quadrangular scutes ; the majority of the 

 fixed scutes being either pentagonal or hexagonal. 



^ Ann. Sci. Nat. ser. 2, vol. xi. p. 217 (1839). — The name also occurs in the 

 ' Overs. K. Danske Vid. Selsk. Forhandl.' 1838, p. 11, buf^ with insufficient 

 description, and misspelt CMamytherium. 



^ Quoted by Gervais and Ameghino in ' IMammiteres Fossiles de I'Araerique 

 Meridionale,' p. 210 (1880). 



^ Gervais and Ameghino, op. cit. p. 210. Ameghino, Bol. Ac. Nac. Cordova, 

 vol. ix. p. 205 (1886), says that the lower teeth have an elliptic cross-iCL'tiou. 



