con·chol·o·gy
The collection and study of mollusk shells. con′cho·log′i·cal (-kə-lŏj′ĭ-kəl) adj. con·chol′o·gist n.
What is called Conchologist?
Definitions of conchologist. a collector and student of mollusc shells. type of: aggregator, collector. a person who collects things.
What do you mean by Malacology?
: a branch of zoology dealing with mollusks.