80 ANIMAL RESOURCES OF THE UNITED STATES. 



15. PEAEL— Continued. 



a. Pearls and nacre; 



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

 facture of shell-flowers. 



Tower-shells, {Trochidcc.) 



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

 handles, inlaid work, and pearl-powder. 



Other gastropods supplying nacre. 



Pearl-oysters, {AvicuUdw,) 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, C. tuherosa, and C. madagascari- 

 ensis,) with carvings. 

 h. Shells used for implements, &c. : 



Shells of Strombus, Triton, DoUum, Fusus, Mttrex, and 

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

 borders in flower-gardens. 



Shells of Busycon, Sycotypits, 3Iactra, &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 jacohceus,) used as a deco- 

 ration of honor.) 



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

 of Hindoo bangles, and in polishing cloth.) 



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



