14 CHELONIAD A. 
are rounded, and composed of a number of round obtuse 
tubercles. These seven ridges are equidistant, and consist 
of one along the median line of the back, one on each 
margin of the shell, and two on each side between the 
dorsal and the marginal one... The anterior paddles are 
remarkably long, being more than twice the length of the 
hinder ones, and somewhat falcate; the latter, however, 
are generally broader than the former. They are covered 
with a perfectly smooth skin. The tail is acute, much 
compressed at the sides, and extends only to the extreme 
point of the dorsal shell. The following figures of these 
parts are from the specimen above mentioned. 
The young individual differs from the adult more con- 
siderably in this species than in any other species of the 
order with which I am acquainted. Some of the peculiari- 
ties of the former age have already been alluded to; in 
addition to which may be mentioned the more full and 
rounded form, the larger head, the larger and more ex- 
panded eye, and the existence of five ridges on the ster- 
num. The eye opens almost vertically, which gives a 
