158 Bulletin American Museum of Natural History. [Vol. XIV, 



Supernumerary Teeth, and other Cranial Abnormalities. 



In the present collection several cases of supernumerary teeth 

 have been noticed, involving the true molars, premolars, and 

 canines. 



Molars. Specimen No. 73492, adult male, Tehuantepec, has 

 a supernumerary (fifth) true molar behind m A on both sides (see 

 PI. XXIII, Fig. 5); it is about half the normal height, and is pat- 

 terned on the plan of m 4 , from which it differs mainly in its- 

 smaller size. In No. 77688, adult male, Huehuetan, Chiapas, 

 there is a well developed fifth molar in the left side, similar in 

 character to m A , but about one third smaller (PI. XXIII, Fig. 6). 



In No. 14614, adult female, Santa Marta, Colombia, m^ on 

 both sides is V-shaped, having two equal outer angles, and thus 

 is practically of the same pattern as m^, except that it is shorter, 

 and the middle cone of the outer border is suppressed. 



No. 33831, young adult male, has on the right side a minute 

 tooth about the size and shape of a small incisor, situated between 

 m 1 and m^, in the outer border of the toothrow. 



In several specimens teeth abnormal in position have been 

 noticed, especially in the case of m 4 -, which may be thrown in- 

 ward, or backward, in the latter case leaving a space nearly 

 the width of the tooth between it and m^. In general the outer 

 edge of m- 4 - forms the most projecting portion of the toothrow, be- 

 ing even with or projecting slightly beyond the outer border of 

 m- 2 -. In quite a number of cases m^ is placed inward, so that the 

 outer edge of nv 3 - projects considerably beyond m A . 



Premolars. Several instances have been noted of the occur- 

 rence of a minute supernumerary premolar, on one or both sides 

 of the skull. Thus, in the skull last mentioned (No. 33831), there 

 is a minute tooth on the left side between p 4 - and m 1 , and another 

 between m 1 - and m^. No. 100507, young adult male, and No. 

 100508, young adult female, both from Frontera, Tabasco, each 

 has a minute supernumerary tooth on the outer alveolar border 

 between p^ and p- 4 on each side. There is also a similar develop- 

 ment in No. 56857, adult male, and No. 58688, adult female 

 both from Mirador, Vera Cruz. An old female from Rockport 

 Texas, has a minute supernumerary tooth between p^ and p on 

 each side, on the outer alveolar border. 



