PLATE 39. 



CARCHARIDAE and MYLIOBATIDAE. 



Fig. 1. Carchakias taorus (Page 25). Fig. 2. Myliobatis freminvillii (Page 432). 



These longitudinal sections of the head and anterior part of the body contrast the conditions in one 

 of the lower of the Antacea with those in one of the most specialized of the Platosomia. The sections 

 show the cartilages of the skull, those of the forward portion of the vertebral column, and in part those 

 of the branchial apparatus; they show the brain, its chamber, the celular cavities of the head, tlie mouth 

 cavities from the lips to the stomach, the jaws, the teeth, tlie pads protecting the roof of the mouth, and 

 tlie arrangement of the muscles. 



