288 The Commercial Products of the Sea. 



CHAPTER XL 



INDUSTRIAL AND MANUFACTURING USES OF SHELLS- 



Con tinned. 



Shell bangles or bracelets, made from the chank or Tttrbinella species Re- 

 ligious veneration for the shell Process of manufacture The bangles 

 described Great clam shells used as benitiers The queen conch, large im- 

 portations of Uses of nacreous and iridescent shells Utilization of shells 

 for economic purposes Shell utensils Shell flowers Shell trumpets- 

 Shell pipes Pulverized and calcined shells Ornamental uses of opercula 

 -Dyes from the mollusca Tyrian purple Marine silk. 



Shell Bangles or Bracelets. Under the commercial name 

 of chanks, the large white, concave, heavy, porcelaneous 



FIG. 19. 



Chank shell {Turbinella pyrum}. 



shells of the Turbinella pyrum, Lam., the Valuta grains, 

 Lin., and T. rapa, are much prized in India. The shell is 

 ventricose above, pear-shaped, fulvous white, with reddish 

 spots in young individuals. 



