GLOSSARY 



Acetabulum, the deep socket in the hip-bone for the head of the femur. 

 Acromion, the projecting lower end of the spine of the shoulder-blade. 

 Alisphenoid canal, canal in the base of the skull for the external carotid 



artery. 

 fAllotheria, an extinct suborder of Mesozoic and Paleocene Marsupials. 

 fAmblypoda, an extinct order of hoofed mammals. 

 Anconeal fossa, a deep pit on the posterior side of the humerus, near the 



lower end. 

 Anconeal process, see Olecranon. 

 tAncylopoda, an extinct suborder of Perissodactyla. 

 Angle, of the lower jaw, the postero-inferior corner. 

 Angular process, a hook-like projection from the angle of the lower jaw. 

 Anterior nares, the forward opening of the nasal passage. 

 Anthropoidea, Monke}^, Apes, Man ; suborder of Primates. 

 Appendicular skeleton, bones of the limbs and limb-girdles. 

 Araucanian, PUocene of Argentina, including the Catamarca and Monte 



Hermoso. 

 Artiodactyl, see Artiodactyla. 



Artiodactyla, Cattle, Deer, Camels, Pigs, etc., etc., order of hoofed mammals. 

 Ascending ramus, posterior, vertical portion of the lower jaw. 

 Astragalus, the ankle-bone. 

 Astraponotus Beds, upper Eocene or more probably, lower Oligocene of 



Patagonia. 

 tAstrapotheria, an extinct order of hoofed mammals. 

 Atlas, the first vertebra of the neck. 

 Auditory bulla, one of a pair of inflated bony capsules at the base of the skuU ; 



the tympanic bone. 

 Auditory meatus, the entrance to the buUa. 

 Axial skeleton, the skull, backbone, ribs and breast-bone. 

 Axis, the second vertebra of the neck. 



fBafytheria, an extinct order of elephant-like mammals. 



Biceps muscle, the large flexor muscle of the front of the upper arm ; its 



contraction bends the elbow. 

 Bicipital groove, a groove between the tuberosities of the humerus for the 



upper tendons of the biceps. 



fExtinct. 



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