310 



A MANUAL OF DENTAL ANATOMY. 



The tusk of the male narwal may fairly be assumed to 

 serve as a sexual weapon, but little is known of the habits 

 of the animal. 



FIG. 133 0). 



iNatSi* 



Professor Turner has lately noted the occurrence of two 

 stunted incisor rudiments in a foetal narwal : these ob- 

 viously represent a second pair of incisors, and attain to a 

 length of half an inch, but are irregular in form ; they are 

 situated a little behind the pair of teeth which attain to 



(*) Cranium of Narwal (Monodon monoceros). a. Stunted tooth, with 

 its basal pulp-cavity obliterated, b. Long tusk. The small figure, giving 

 the whole length of the tusk, shows the proportion which it bears to the 

 rest of the skull. 



