1883.] 



PROF. FLOWER ON THE DELPHINIDjE. 



471 



Fig. 1. Posterior part of the osseous palate of Globiceps melas, showing a 

 very general arrangement of the pterygoid bones in the Delphinidm. mx. 

 maxillary bone ; jpal. palatine bone; pt. pterygoid bone ; r. its reflected inferior 

 lamina, enclosing the great post-palatine air-sinus, the opening into which is o. 

 This and all the following figures are drawn one third of the natural size. 



Fig. 2. Posterior part of osseous palate of Plwcana communis. The pterygoid 

 bones are comparatively little developed and far apart. A portion of the 

 vomer, of irregular form, is seen in the middle line, behind the palatine bones. 

 Though generally present, this bone varies considerably in form and extent in 

 different individuals. 



