AMERICAN BATS — HANDLE Y 



101 



PAR6C0NE 

 (PROTOCONE) 



MESOSTYLE 



PROTOCONID 

 PROTOCONID 

 HYPOCONID - 



PROTOCONE 

 (DEUTEROCONE) 



HYPOCONE 

 (TETARTOCONE) 



PROTOCONE 



HYPOCONE 



P' COMMISSURE 



2^ COMMiSSiJRE 



S^^COMMISSURE 



METACONID 

 (TRITOCONID) 



PARACONID 



— METACONID 



ENTOCONID 



TRIGONID 

 TALONID 



Figure 3. — Nomenclature of teeth of Plecotus. Right upper dentition (above) and left 



lower dentition (below). 



There are many objections to the behef that the permanently 

 missing incisor is V, and no really substantial evidence as to which, 

 if either, of the others it may be. However, what evidence there is 

 favors the theory that the missing tooth may be I^. 



The deciduous dentition does not contribute information on the 

 lost tooth. No more than two upper incisors have been observed in 

 any normal chiropteran deciduous dentition. For the Vespertilionidae, 

 the formula is the same in all of the genera for which it is known: 



,.2-2 , 1-1 , 2-2 „_ 

 ^^ 3=3'^^ 1:4' ^P 2=2 = 22- 



