168 REPTILES. 



long, flexible, tubular, pig-like snout; neck long. Feet 

 broadly webbed; toes long, 5-5, but the claws only 3-3. 

 Aquatic, carnivorous and voracious; species about 30, 

 in both hemispheres. 



* Nostrils terminal, crescent - shaped ; a prominent longitudinal 

 ridge projecting from each side of septum. Aspidonectes, 1. 



** Nostrils rather under the tip of snout; nasal septum with- 

 out an internal longitudinal ridge on each side. Amyda, 2. 



/. ASPIDONECTES, Wagler. Soft -Shelled Turtles. 



1. >}. 5/7//7//e/*, (LeSueur) Ag. Commox'Sopt- Shelled 

 Turtle. Carapace olive brown with dark spots; plastron 

 nearly white; head and neck olive green with light 

 and dark stripes; legs and feet mottled every where 

 with dark; male with the tubercles on the front of the 

 carapace smaller than in the female, the body also longer 

 and the tail extending considerably beyond the margin 

 of the carapace. Great Lakes and Upj^er Mississippi, 

 abundant. 



2. A. nuchalis, Ag. Cumberland Turtle. A marked 

 depression on either side of the keel, which is dilated 

 and triangular anteriorly; spines and tubercles on cara- 

 pace largely developed. Cumberland and Upper Tenn. 

 Rivers. 



2. AMYDA, Agassiz. Leathery Turtles. 



1. A. mut/cd, (Les.) Ag. Leathery Turtle. A 

 depression along median line of carapace; no spines nor 

 tubercles along anterior margin nor on back; feet not 

 mottled below. Upper Mississippi and Great Lakes. 



OEDER U. - LAGEETILIA. 



{T7ie Lizards.) 

 Reptiles not shielded, with the body usually covered 



