456 Prof. K. A. von Zittel—On the Mammalia. 
deposits, from 60 to 80 métres in thickness. 
The following genera 
are known up to the present from the Santa Cruz Formation :— 
MARSUPIALIA. 
Lodidelphys. 
Lrodidelphys. 
Microbiotherium. 
Stvlognathus. 
fladrorhynchius. 
Prothylacinus. 
Perathereutes. 
? Borhyena. 
? Acrocyon. 
? Agustylus. 
? Hathlyacinus. 
? Dinamyctis. 
? Conodinyctis. 
? Anatherium. 
? Szpalocyion. 
? Acyon. 
? Lctioborus. 
? Cladosictis. 
? Protoproviverra, 
Abderites. 
Acdestis. 
Decastis. 
Epanorthus. 
Callomenus. 
flalmadromus. 
flalmaselus. 
Lssoprion. 
Pichipilus. 
Garzonia. 
Halmariphus. 
EDENTATA. 
a. Vermilinguia. 
Scoteops. 
b. Tardigrada. 
Lintelops. 
Dideilotheriunm. 
c. Gravigrada. 
ZLAMIUTUS. 
Hapalops. 
Pseudhapalops. 
Anphihapalops. 
Schismotherium. 
Trematherium. 
Nematherium. 
Geronops. 
Analcimorphus. 
Lucholeops. 
fiyperleptus. 
AX yophoros. 
Flanops. 
Paraplanops. 
Metopotherium. 
Leurysodon. 
Tolmodus. 
Prepotherium. 
Lymodon. 
Analcitherium. 
Ammotheriun. 
d. Glyptodontia. 
Cochlops. 
Feucinepeltus. 
Propaleohoplophorus. 
A sterostemma. 
e. Dasypoda. 
Dasypus. 
Chlamydotherium. 
Peltephilus. 
Stecotherzum. 
Prozedyus. 
Proeutatus. 
? Anticsodon. 
PERISSODACTYLA. 
a. Proterotheride. 
Diadiophorus. 
Licaphrium. 
Thoatherium. 
Proterotherium. 
b. Macrauchenidee. 
Theosodon. 
Calosoma. 
Pseudocelosoma. 
TOXODONTIA. 
Nesodon. 
Adinotherium. 
? Gronotherium. 
? Xoloprotodon. 
? Acrothertum. 
? Phobereotherium. 
? Nannodus. 
? Rhadinotherium. “?@ 
? Paleolithops. 
Astrapotherium. 
? Listriotherium. 
? Astrapodon. 
Homalodontotherium. 
? Diorotherium. 
Colpodon. 
TYPOTHERIA. 
Protypotherium. 
Patriarchus. 
Interatherium. 
Icochilus. 
Hegetotherium. 
RODENTIA, 
Stervomys. 
Acaremys. 
Sciamys. 
Scleromys. 
Adelphomys. 
Stichomys. 
Olenopsis. 
Spaniomys. 
Neoreomys. 
Hledimys. 
Phanomys. 
Kocardia. 
? Procardia. 
? Dicardia. 
? Tricardia. 
Schistomys. 
Spheromys. 
Sphodromys. 
Sphingomys 
Perimys. 
Pliolagostomus. 
Prolagostomus. 
Lagostomus. 
Scotoeuntys. 
PRIMATES. 
Homunculus. 
? Homocentrus. 
Anthropops. 
? Hudiastatus. 
The composition of this Patagonian Tertiary fauna, which accord- 
ing to Ameghino is preceded by some older mammalian remains, 
intermingled with some probably Dinosaurian and Crocodile bones, 
stands in the strongest contrast with the Mammalia occurring in the 
Kocene of Europe. 
Of the 121 genera introduced above, with at 
least 220 species, a notable proportion will very likely not stand 
critical examination, but in any case the fossil mammalian fauna of 
Santa Cruz notably exceeds, in its wealth of genera and species, that 
