44 THE VERTEBRATE SKELETON. 



Family Megatheriidae. Megatherium ground sloth. 

 Family Myrmecophagidae. Myrmecophaga great ant- 

 eater. 



Cycloturus two-toed ant- 

 eater. 



Family Dasypodidae. ChlamydophorusA 

 Dasypus 

 Priodon -armadillos. 



Tatusia 



Family Glyptodontidae. Glyptodon. 

 Family Manidae. Manis pangolin. 

 Family Orycteropodidae. Orycteropus aard vark. 



Order 2. SIREXIA. 



Family Manatidae. Manatus manatee. 

 Family Rhytinidae. Rhytina S teller's sea-cow. 

 Family Halicoridae. Halicore dugong. 

 Family Halitheriidae. Halitherium. 



Order 3. CETACEA. 

 Suborder (1). ARCHAEOCETI. 

 Family Zeuglodontidae. Zeuglodon. 



Suborder (2). MYSTACOCETI or BALAENOIDEA. 

 Family Balaenidae. Balaena right whale. 



Megaptera humpbacked whale. 

 Balaenoptera rorqual. 



Suborder (3). ODONTOCETI. 

 Family Physeteridae. Physeter sperm whale. 



Hyperoodon bottlenose. 



Ziphius. 



Mesoplodon. 

 Family Physodontidae. Physodon. 



