116 ALES' HRDLIKA 



BASE: Foramen lacerum medium: Of evolutionary and developmental 

 importance. 1 May be small, submedium, medium, or spacious. 



Depression of Petrous Parts: Of evolutionary and developmental 

 importance. 1 The depression is in relation to the inferior surface of 

 the basilar process. The petrous portions may be slightly above the 

 level of the process, or present a slight, medium (+), or pronounced 

 depression below the plane of the basilar process (as viewed with the 

 base facing the observer). 



Styloids: Absent, diminutive, small, medium (+), excessive. 



Special: The base offers numerous anomalies, such as pterygo-spi- 

 nous foramina, defects in the floor of the auditory meatus, basilar fossa, 

 pharyngeal canal, great inequalities of the jugular canals, various 

 anomalies about the foramen magnum basilar spine, third condyle, 

 pre-condylar processes, rudimentary atlas, accessory articular facets, 

 paroccipital (paramastoid) processes, etc. In view of the multi- 

 plicity of these features it is best to make a special examination for 

 those the observer may wish to report upon. 



LOWER JAW: Chin pointed, rounded, square; receding, vertical, 

 slight, medium or marked protrusion. Peculiarities: Report extra- 

 ordinary features of importance. 



TEETH : Dentition: In children and adolescents note all teeth erupting 

 or erupted. Teeth of first and second dentition must be carefully dis- 

 tinguished. Wear: None, slight, moderate, marked, excessive. Decay: 

 Note number of teeth lost through or affected by decay. Special and 

 Anomalies: Ventral surface of upper incisors may be marked by shovel- 

 shaped concavity with pronounced rim, which is characteristic of the 

 American Indian, occurs occasionally in other yellow-brown people, 

 but is rare or less frequent in other races. In line of dental irregulari- 

 ties and anomalies note crowding, impactions, congenital defects of 

 eruption, supernumerary teeth, and abnormalities of individual teeth. 

 A study of the cusps, as well as that of the form and size of the teeth, is 

 best carried out separately. 



1 See HrdliSka (A.), "Certain Racial Characteristics of the Base of the Skull," 

 Science, 1901, XIII, 309; also Proc. Assoc. Amer. Anatomists, 15th Session, Amer. J. 

 Anat., 1901-2, 1, 608-9. 



