80 ANIMAL RESOURCES OF THE UNITED STATES. 



15. PEAEL— Continued. 



a. Pearls and nacre: 



Top-shells, {TurUnidcc,) and their application to manu- 

 facture of shell-flowers. 



Tower-shells, {Trochidce.) 



Ear-shells, (Haliotidw,) used in manufacture of buttons, 

 handles, inlaid work, and pearl-powder. 



Other gastropods supplying nacre. 



Pearl-oysters, (AvicuUdce,) with pearls and nacre. 



Eiver- mussels, ( Unionidce,) with pearls and nacre. 



Mussels, oysters, and other conchifers supplying pearls 

 and nacre. 



Shells of nautilus and argonaut, prepared to exhibit 

 their nacre. 



Ornamental pearl- work, imitating sprays of flowers, &c. 



Imitation pearls. 



16. SHELL. 



a. Cameo shell : 



Shell of conch, {Stromhus gigas,) and carvings. 



Shell of helmet, {Cassis rnfa, G. tuherosa, and G.madagascari- 

 ensis,) with carvings. 

 h. Shells used for implements, &c. : 



Shells of Strombus, Triton^ Dolium, Fusus, Mnrex, and 

 Buccinum, used for fog-horns, lamps, vases, and ornamental 

 borders in flower-gardens. 



Shells of Busycon, Sycotypus, Mactra, &c., used by Indians 

 in manufacture of implements, with specimens of imple- 

 ments. 



Shells of Mactra, used for ladles, scoops, and spoons by fish- 

 ermen. 



Shells of Tridacna, used for vases, fountains, and in the man- 

 ufacture of handles and carvings. 



Shells of Pecten, Haliotis, Bentalium, Mercenaria, &c., used 

 by Indians for trimmings and ornaments. 



(Scallop, or palmer's shell, {Pecten jacohwus,) used as a deco- 

 ration of honor.) 



(Chank shell, {Turbinella pyrum,) used in the manufacture 

 of Hindoo bangles, and in polishing cloth.) 



Shells of Pecten, used in making pin-cushions and purses. 



