Form-Catalogue is one in which the entries are arranged according to the forms of literature and the languages in which the books are written, either alphabetically or according to the relations of the forms to one another.
Apart from these there is a style of catalogue in which the entries are selected to suit the kind of person for whom the books are designed. A catalogue of books for children would be of this order. While it would include books in all classes of literature written to suit juvenile capacity, yet it may reasonably be regarded as a class in itself, and a place is usually assigned to it in a classified catalogue.
When a catalogue of a particular class of literature is separately published it is called a Class-List. A catalogue of novels, or of poetry, or of music would be so termed.
By the term Dictionary Catalogue we understand a combination of the first three, viz., Author, Title, and Subject catalogues in a single alphabet.
The last two forms when thrown together, not in alphabetical but in logical arrangement, make the Classified Catalogue.
The same two if arranged alphabetically and not logically form the Alphabetico-Classed Catalogue. With this last form the author-catalogue could be combined without any disturbance of its arrangement. It can only be added to the classified as an index or appendix.