Source : Webster's Revised Unabridged Dictionary (1913)

Conchology \Con*chol"o*gy\, n. [Conch + -logy.] (Zo["o]l.)
   The science of Mollusca, and of the shells which they form;
   malacology.

Source : WordNet®

conchology
     n : the collection and study of mollusc shells [syn: {shell
         collecting}]