SOFT-BODIED ANIMALS— THE MOLLUSKS 



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Photos by Winchester 



Fig. 19.11. Varieties of mollusk shells. Many strange and beautiful shapes and pat- 

 terns of shells are produced by the. mantle of different species of mollusks. Left to 

 right and top to bottom these are : the pearl oyster, Avicula, collected near the coast 

 of china ; the thorny oyster, Spondylus pictorum, from the East Indies ; the black 

 abalone, Haliotis cracheroidii, from California ; Ptcrosera lambis, from the East Indies ; 

 the Turk's cap, Turba sanitations^ from Africa ; Mures scolopax, from Japan ; Conns 

 litteratits, from Ceylon; and Triton tritonis, from the South Pacific. 



