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COMPARATIVE DENTAL ANATOMY 



which have expanded crowns, with a blade of 

 spear-like form with serrated edges. The "Gila 

 Monster" (Fig. 32) (Heloderma) is a large lizard 

 of Mexico and Arizona, which has teeth of thin, 

 flattened spear-shape with apparent grooves, 

 which increase in size from front to back. The 

 bite is said to be poisonous, bnt its toxic effect 

 may be due to the saliva only. 1 A New Zealand 



Fig. 32. — Teet 



lizard (Hatteria) has the intermaxillary bones 

 armed with two teeth so large as to be as wide 

 as the jaw, and which resemble the scalpriform 

 teeth of the Eodents. When worn down to the 

 jaw, the bone then comes into nse and is worn 

 away with the teeth. The African "Frilled" 

 Lizard (Dicryodon) has sharp margins to the 



iGood authority claims the bite of the Gila Monster is only poisonous 

 when it has been eating poisonous insects. — bditor. 



