174 DINOCERATA. 



(1.) Brain, large and convolnted. 



(2.) Canines, absent. 



(3.) Incisor tusks. 



(4.) Maxillo-turljinal bones. 



(5.) Premolar and molar teeth, similar. 



(6.) l\Ialar bone articulating with lower jaw. 



(7.) Alisphenoid canal. 



(8.) Post-glenoid process. 



(9.) Odontoid process, conical. 

 (10.) Cervical vertebrae, convexo-concave. 

 (11.) Trunk vertebra;, twenty-nine or more. 

 (12.) Scapula, spatulate. 

 (13.) Iliac bones, parallel. 

 (14.) Femur with third trochanter. 

 (Ifj.) Femur and tibia not in line. 

 (l(j.) Ulna and fibula, complete. 

 (17.) Feet, plantigrade. 

 (18.) Axis of foot through third digit. 

 (19.) Carpals and tarsals not interlocking. 

 (20.) Central bone in carpus. 

 (21.) Three bones in first tarsal row. 

 (22.) Astragalus, grooved. 



The Proboscidians, recent and extinct, may all be placed in a single 

 order, Avith the following distinctive characters : 



(1.) Brain, large and convoluted. 



(2.) Canines, absent. 



(3.) Incisor tusks. 



(4.) Maxillo-turbinal bones, rudimentary. 



(5.) Malar bone forming middle of zygomatic arch. 



(6.) Post-glenoid process, absent. 



(7.) Alisphenoid canal. 



(8.) Odontoid process, conical. 



