12 ANIMAL RESOURCES OF THE UNITED STATES. 
Il. REPTILES. 
26. CROCODILIA. (Alligator, crocodile.) 
Useful products: 
Food. D.1. 
Ivory. D. 8 
Leather. D. 20. 
Oil. D. 27. 
Musk. D. 28. 
Injurious traits : 
Enemies of man and domestic animals. 
27. TESTUDINATA. (Tortoises, terrapin, leather-back, green, logger- 
head, and hawks. bill turtles.) 
Useful products: ; 
Food: Flesh, (green turtle, terrapin, gopher tortoise.) D.1. 
Eggs, (green turtle, terrapin, gopher tortoise.) 
Oil from eggs, (green turtle.) D. 27. 
Shell, (turtles.) D. 13. 
Perfume. D. 28. 
Methods of capture and transportation. FE. 3. 
28. uACERTILIA. (Lizards, skinks, horned-toads, chameleons, scor- 
pions, joint-snakes, &c.) 
Useful products: Food of Indians. D.1. 
Medicinal product: (Skink.) D. 30. 
Useful traits: Destroy noxious insects. 
29. OPHIDIA. (Snakes.) 
Useful products : 
Leather, (rattlesnakes, bull snakes.) D. 27. 
Medicinal products, (rattlesnakes, copperheads.) D. 30. 
Oil, (rattlesnakes.) D. 27. 
Useful traits: Destroy vermin. 
Injurious traits: Enemies of man, (rattlesnakes, copperheads, 
and moccasins.) 
IV. AMPHIBIANS. 
30. ANURA. (Frogs, toads, hyla, &c.) 
Useful products: 
Food, (frogs.) D.1. 
Material for physiological instruction, (frogs.) 
