EASTMAN: MYLOSTOMID PALATAL DENTAL PLATES. 



263 



be oriented in natural position with respect to each other, arguments 

 based upon the mutual adjustment and interplay of various parts have 



Fig. 1. Outline sketch showing the position in which the constituent parts of 

 the dentition were embedded with respect to the headshield containing the single 

 individual of Mylostoma variabile juv. described by Dean, x i (after Dean). 



been brought forward, whose combined force is seemingly incontroverti- 

 ble, and the effect of which is to negative the foregoing assumption. 

 And inasmuch as this premise lies at the very starting-point of Dean's 



