16 ANIMAL RESOURCES OF THE UNITED STATES 
39. NEMATOGNATHI. (Cat-fish, “bull-heads,” &c.) 
Useful products : 
Food. D. 1. 
Guano, (cat-fish.) D. 31. 
40. APODES. (Eels, congers.) 
Useful products: 
Food. D.1. 
Bait, eel-skins. D. 5. 
Leather, (eels.) D. 20. 
41. CYCLOGANOIDEI. (Mud-fish, or amia.) 
42, RHOMBOGANOIDEI. (Gar-pikes.) 
Useful products: Scales, used for arrow-tips. D. 14. 
’ Injurious traits: Enemies of other fish. 
43, SELACHOSTOMI. (Paddle-fish, or spoon-bill) 
44, CHONDROSTEI. (Sturgeons.) 
Useful products: 
Foods: Fresh. D.1. 
Smoked. D.1. 
Eggs, pickled, (caviare.) D. 3. 
Chorda-dorsalis, dried, (veziga.) D. 2. 
Isinglass, (sturgeon.) D. 24. 
Oil. D. 27, T. 
Scales. D. 14. 
Useful traits: Scavengers. 
Injurious traits: Said to destroy eggs of white-fish. 
VI. ELASMOBRANCHIATES. 
45. HOLOCEPHALI. (Chimera, or king of the herrings.) 
46. RALA. (Skates, rays, “ devil-fish.”) 
47, SQUALL. (Sharks.) 
Useful products: 
Food, (sharks, skates.) D. 1. 
Bone, (sharks.) D. 9. 
Oil, livers, (sharks, rays, &c.) D. 27. 
Shagreen, (sharks.) D. 20. 
Injurious traits: Enemies of nan and fishes, 
