ARCHEOLOGICAL INVESTIGATIONS IN MISSOURI 251 



Figure 21. — Transverse frontal curves of six Mound series crania (see p. 247 for method). 

 Dashes represent damage; dotted line is the true curve. The dot is the point where 

 bregma and nasion coincide; the cross occurs where the minimum frontal diameter inter- 

 sects the radius of the true curve. A (U. S. N. M. No. 379109), radius 6.5 cm.; B (3791 16), 

 radius 6.0 cm.; C (379112), radius 5.5 cm.; D (379113), radius 5.5 cm.; E (379110), radius 

 5.0 cm.; F (379111), radius 4.5 cm. (Slightly reduced: Scale = 2.0 cm.) 



