Webster's 1828 Dictionary
CRUSTALOGY
n.[L., a shell, Gr. , discourse. ] That part of zoology which treats of crustaceous animals, arranging them in orders, tribes and families, and describing their forms and habits. [Crustaceology, the word sometimes used, is ill-formed, and its derivatives inconveniently long. Who can endure such words as crustaceological? ]
Webster's 1913 Dictionary
CRUSTALOGY
Crus *tal "o *gy (krs-tl "-j ), n. Etym: [L. crusta shell + -logy. ]
Defn: Crustaceology.
The Wordsmith Dictionary