1904- Anderson. — ihc Teeth iji Mesoplodoii Hectori. 



127 



suggested that these large teeth situated close to the symphysis 

 of the lower jaw in front can be partially extruded from the 

 socket whilst still lying beneath the mucous membrane. 



A covering of enamel was clearly distinguishable on one 

 tooth. 



Fig. I. Tooth oi Mesoplodon Hcctori. 

 ,, 2 Tooth of Ichthyosaurus (Z/rtJ-.) 

 ,, 3. Tooth of Mosasaurns (C//rt;//6.) 



The length of each tooth is 52 mm., and its greatest breadth 

 5 mm., whilst the sockets are each i| inches deep, and the left 

 one has a diameter of 20 mm. at the base from before back- 

 wards, and 15 mm. from side to side. 



The tooth is here figured side by side with the tooth of an 

 Ichthyosaur and that of an Mosasaur. 



Queen's College, Galway. 



