CLASSIFICATION OF CHELONIA. 617 
of compartments into which branches of the bronchus open. There is 
a slight muscular “‘ diaphragm.” The filling and emptying of the lungs 
is helped by the protrusion and retraction of the head and legs, but 
there are also “‘ swallowing movements.” There are 1fo vocal chords, 
but there is sometimes a feeble voice. 
In the males, the kidney, the epididymis, and the testes lie adjacent 
Fic. 334.—Scales on ventral surface of plastron of 
: Greek tortoise. 
G., Gular; H., humeral; P., pectoral; Ad., abdominal ; 
f., femoral; A., anal; 4Z., marginal. 
to one another on each side. The males have a grooved penis attached 
to the anterior wall of the cloaca. There is a urinary bladder. 
Classification of Chelonia 
J. ATHEC&. Vertebrze and ribs free from carapace. Skull 
without descending processes from parietals. 
Sphargide, leathery-skinned turtles, with flexible carapace. Sphargis 
(Dermatochelys) cortacea, the only living species, the largest modern 
