228 PROCEEDINGS OF THE ACADEMY OF [1880. 



teeth in the Chiroptera. The buccal, approximal and median surfaces 

 should be carefully studied in the different genera. Full descrip- 

 tions of these differences would be out of place in a communication 

 of this kind. One notable feature of man_y as seen in the canines 

 is especially well developed in the bats, viz., the junction of the 

 buccal and palatal surfaces resulting in forming a thin com- 

 pressed posterior edge. This may receive the name of the 

 " sabre " edge. It is repeated and exaggerated in the last pre- 

 molar and forms at least in Chiroptera (other than the Pteropidse) 

 the " sectorial " surface of the tooth. It constitutes a sharp 

 obliquelj'-placed ridge which is parallel with the last stroke of the 

 first V, and is doubtless serially homologous therewith. 



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