8/6 The American Naturalist. [October, 
The families embraced in the above orders are the following : 
Marsupialia ; ( Polyprotodontid) ; Triconodontids, Amphi- 
theriidae. Myrmecobiidae, Dasyuridae, Didelphidae, Perame- 
lidas ; (Diprotodontia); Phascolomyidse, Phalangistidae, Tarsi- 
pedidae, Diprotodontidae, Macropidae, Thylacoleontidae. 
Cetacea ; [ArchcBoceti) ; Zeuglodontidae ; {Odontoceti) ; Squalo- 
dontidae, Platanistidae, Physeteridae, Delphinidae, {Mysta- 
coceti); Bala^nida^. 
SiRENiA ; Prorastomidae, Halitheriida;, Manatidaj, Halicoridae, 
Rhytinidae. 
Bunotheria; {Pantotherid) ; Amblytheriidae ; {Creodonta) ; Meso- 
nychidae, Esthonychidae, Arctocyonidae, Miacidae, Hyaeno- 
dontidae, Leptictidae, Centetidae ; {Insectivord) ; Galeopithe- 
cidae, Tupaeidae, 5olenodontidae, Macroscelididae, Talpidae, 
Adapisoricidae, Mythomyidae, Scalopidae, Chrysochloridae, 
Erinaceidae, Myogalidae, Soricidae ; {TcEniodonta) ; Ectoga- 
nidae, Stylodontidae ; {Tillodontd) ; Tillotheriidae. 
Edentata; Orycteropodida;, Manida;, Bradypodidae, Megathe- 
riida;, Myrmecophagidae, Dasypodidae, Glyptodontids. 
Glires ; {Siniplicidcntatd) ; Sciuridae, Muridae, Hystricidae ; 
{Diiplicidcfitata), Leporidae. 
Chiroptera; {/hunialivord) ; Phyllostomidae, Desmodontidae, Rhi- 
nolophidiE, Noctilionidae, Vespertilionidae, Emballonuridae ; 
{Frugivord), Pteropidae. 
Carnivora; {Fissipedia) ; Cercoleptidae, Procyonidae, ^Eluridae, 
Canidae, Bassarididae, Mustelidae, Protelidae, Arctictidae, 
Viverridae, Cynictidae, Suricatidae, Cryptoproctidae, Nim- 
ravidae, Felidae, Hyaenidae ; {Pinnipcdia) ; Phocidai, Otariidas, 
Odobaenidae. 
Ancylopoda ; Chalicotherriida.\ 
Taxeopoda ; {Condylarthra) ; Periptychida:, Phenacodontidc-e, Me- 
niscotheriidai ; {Toxodontia); Proterotheriidai, Mesotheriidae, 
Toxodontidae, Macraucheniidae ; {Hyracoided) ; Hyracidae ; 
{Daubentonioidea) ; Chiromyid^ ; (Quadrumana) ; Mixodec- 
tidae, Adapidae, Anaptomorphidaj, Tarsiidae, Lemuridae, 
Hapalidae, Cebidae, Cercopithecidae ; {Anthropomorphd) ; 
Simiidae, Hominidae. 
