238 A MANUAL OF DENTAL ANATOMY. 



as holdfasts, while the cutting edges of the deeply-notched 

 plates are brought into play to slice up the food. 



Both in structure and general disposition the dental plates 

 in Lepidosiren are paralleled by the teeth of Ceratodus, for 

 some time known only as a fossil, but of which recent 

 examples have been captured near Queensland; this re- 

 semblance was suspected some years ago by my friend, 

 Mr. Moseley, of the Challenger) and has been since worked 

 out by other observers. 



