1889.] The Edentata of North America. 663 
III. Teeth with three internal and three external ribs. 
(L Tail, with distinct rings, and without terminal tube. 
Digits 5-4; Glyptodon OviQX\. 
aa Distal and longer part of tail enclosed in an 
Digits 3-4 ; tail probably spinous ; Dcedicurus Burm. 
Digits ? Caudal tube compressed, and 
with enlarged lateral tubercles ; Einyurns Gerv. and Am. 
Digits 4-4 ; Hoplophorus Lund. 
The -^pccics of tlu-o gcneni aic of various dimensions. Caryo- 
d. 1 '/M sNo. laiiuni (Plate X XX [ I) nas about the size of a glutton 
of (.Ixptodon and Koplophoiu^ iniL;iit Ik C(Mii[)aied to the 
Inpuns nniuuiviu^ Daduunis Javuaudatus Owen icachcd 
.1 lui-th of tucUu fiet. acLoHJuiL; to Hui nu i^u i . and it^ mas- 
dillos, have dnunii.hul in s|/,,,i-. well a- Muiplifiod the forms 
of their teeth. 
It is probable that the 1 )a-\ [)OLlid<L' aie dcsceiulants of the 
GK'ptodontidcL' In a uthKtion of the complexity and increase m 
mimlxr of tin tie th 1 he ])o-terior ungual phaLuigc^ of foetal 
.um.idillo^ au\.utoidin- to\on Hiring, ungulate and trilobate, 
in the later Ccuno/oic beds of South America, most of 
uhiJi belong to existing genera. The principal extinct genus 
known is Eutatus Gerv. which usually resembles Tatusia, but 
ha> fi\c digits on all the feet instead of four. Se\eral species 
Much remains to be learned about the phylogeny of this 
