THE SKULL OF MEGAPTEKA MIOCAENA KELLOGG. 



15 



practically identical in position with those of Megaptera nodosa, A 

 similar ridge separates these apertures. 



YlG. 7. POSTEEIOE VIEW OF RIGHT PERIOTIC OF MeGAPTERA MIOCAENA X 1, CAT. NO. 



10300, U.S.N.M. ; Lompoc, California. 

 TYMPANIC. 



The tympanic bone is relatively dense and heavy, fastened to the 

 periotic by two thin pedicles (fig. 8) and connected with the fenes- 



\ 



Fig. 8. — External view of left tympanic of Megaptera miocaena, about natural 

 SIZE, Cat. No. 10300, U.S.N.M. ; Lompoc, California. 



tra ovalis by a chain of ossicles. In shape and general proportions 

 (fig. 9) it resembles that of Megaptera nodosa, though it is, of 

 course, slightly smaller. The outer surface is nearly subquadrate in 

 outline. It differs from Megaptera nodosa in the following details: 



