80 ANIMAL RESOURCES OF THE UNITED STATES. 
15. PEARL—Continued. 
a. Pearls and nacre: 
Top-shells, (Twrbinida,) and their application to manu- 
facture of shell-flowers. 
Tower-shells, (Zrochid@.) 
Ear-shells, (Haliotide,) used in manufacture of buttons, 
handles, inlaid work, and pearl-powder. 
Other gastropods supplying nacre. 
Pearl-oysters, (Aviculide,) with pearls and nacre. 
| River-mussels, (Uniontde;) 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, &. 
Imitation pearls. 
16. SHELL. 
a. Cameo shell: 
Shell of conch, (Strombus gigas,) and carvings. 
Shell of helmet, (Cassis rufa, C. tuberosa, and C. madagascari. 
ensis,) with carvings. 
b. Shells used for implements, &c. : 
Shells of Strombus, Triton, Dolium, Fusus, Murex, 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, Dentalium, Mercenaria, &c., used 
by Indians for trimmings and ornaments. 
(Scallop, or palmer’s shell, (Pecten jacobwus,) used as a deco- 
ration of honor.) 
(Chank sheil, (furbinella pyrum,) used in the manufacture 
of Hindoo bangles, and in polishing cloth.) 
Shells of Pecten, used-in making pin-cushions and purses. 
