THE BATS 



231 



The upper median incisors are separated by a wide gap and 

 the lateral ones are pointed teeth. The lower incisors are small, 

 semi-procumbent and their crowns are each surmounted by three 

 globular tubercles. The canines both upper and lower are long 

 and sharp. The distal three cheek teeth in both jaws are molari- 

 form and but little removed from the general Insectivore type. 

 Each upper member, except the last, presents a trigon with 

 the three typical cusps and three styles and in addition a low 

 hypocone. The protoeone being reduced, the other cusps of the 



• i rn 1 1 1 TTTTTTnTri 1 1 M mmruj 



Fig. 82. — Dentition of Brown Bat (Vespertilio fuscus, 9J-\). Note the typical Insecti- 

 vore molars and the very specialized incisors. 



trigon and the styles give a prominent W-appearance to the 

 occlusal surface. The last molar has its posterior moiety muti- 

 lated. On each of the three last lower cheek teeth is a typical 

 trigonid with three cusps and a large talonid with hypoconid 

 and entoconid. All the cusps are long, sharp and needle-like 

 as usual in insectivorous teeth and the more anterior post- 

 canines simple and conical. The premolar-molar series resem- 

 bles that of the Mole very closely in the characters of the 

 individual teeth. 



In the above description it is worthy of note that the molars 

 are not so specialized as the incisors. In discussing the denti- 



