PLATE 4. 



Skull C. 



Skull D. 



•ONVOLD OK 



Fig. I. 



Fig. 2. 



Fig. ic. 

 All the figures reduced to half of the natural size. 



Fig. I. Skull C. Mr. Rowland Ward's Specimen, purchased by B. M. 



Fig. la, b, c. Top, lateral and basal view of the pair of rudimentary ossicones. 



Fig. 2. Skull D. Mr. Boyd Alexander's specimen presented to B. M. 



turn, fmo'o 



