288 The Commercial Products of the 



tea. 



CHAPTER XL 



INDUSTRIAL AND MANUFACTURING USES OF SHELLS 



Continued. 



Shell bangles or bracelets, made from the chank or Ttirbinella 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 pyrtim, Lam., the Voluta grams, 

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

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

 spots in young individuals. 



