22 CHELONIA. 



9. The lungs are extensive, and are placed in the same cavity with the other 

 viscera. 



10. The heart is composed of two auricles, and of one ventricle, subdivided in 



two unequal cavities that communicate with each other, so that the current 

 of blood from the lungs and that from the body generally, are more or 

 less mingled in passing through the ventricle. 



11. The stomach is simple and very strong, with thick walls. The intestines are 

 of moderate lenafth and destitute of a coecum. 



s 



12. The eggs are round, and the shell more or less firm. 



13. The young undergo no metamorphosis, but resemble the parent in general 



form, from the time they leave the shell. 



This order, in the twelfth edition of the Systema Naturae of Linnaeus, comprised 

 only fourteen species, all united in one genus Testudo; it now includes about 

 eighty, distributed in several different families and genera. 



