III.] LIST OF THE FAUNA. 115 



3. HYSTRICOMORPHA. Santa Cruz. 



Caviidce. Paran a. 

 Dasyproctidce . 

 Dinomyidce. 



Lagostomatidcz. Santa Cruz. 

 Hystricidae. Santa Cruz. 



Octodontidae. Mainly Neotropical, but also Ethi- 

 opian. Santa Cruz. 



* Eocardiidce. Santa Cruz. 



4. LAGOMORPHA. 



Leporidae. Represented by two species of 

 Lepus. 



VII. EDENTATA. Santa Cruz. 



Dusypodida. Santa Cruz. A few forms range 

 as far as Texas. 



* Glyptodontida. Santa Cruz. One Neogaeic genus 



ranges as far north as Texas, and a peculiar 

 one has been described from further north. 



* Megalotheriidce. Santa Cruz. Mainly Neogaeic, 



but also ranging into North America. 

 Myrmecophagidcz. 

 Bradypodidcz. 



VIII. MARSUPIALIA. Santa Cruz. 



1. DIPROTODONTIA. Santa Cruz. (Elsewhere only in 



Notogaea). 



Epanorthidcz. Santa Cruz. (One existing genus, 

 Ccenolestes). 



* Abderitidcz. Santa Cruz. 



* GarzoniidcB. Santa Cruz. 



2. POLYPROTODONTIA. Santa Cruz. 



Didelphyidae. Now mainly Neogaeic, where they 

 date from the Monte Hermoso stage, but 

 ranging into North America, and formerly 

 widely spread over the northern hemisphere. 

 Chironectes, several subgenera of Didelphys, 

 and Dromiciops peculiar to the realm. 



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