522 



ANATOMY OF VERTEBRATES. 



and granules^ ib. a. This vascular surface is covered by a delicate 

 carpet of epithelial cells, fig. 348 , certain linear tracts of which, 



347 



Respiratory surface, lung.of Newt, magnified, with the epithelium 

 out of focus. CCLXVIII. 



ib. by b 9 are ciliated. The exterior of the lung is covered by 

 delicate peritoneal nonciliated scales. 



348 



surface, lung of Newt, magnified, with the epithelial covering 



ill fOCUS. CCLXVIII. 



In the Siren the lungs are narrow bags, coextensive with the 



