129), and he also accepted his genera of cuttlefishes.
After this Lamarck judiciously refrained from publishing descriptions of new species, and other fragmentary labors, and for some ten years from the date of publication of his first zooelogical article reserved his strength and elaborated his first general zooelogical work, a thick octavo volume of 452 pages, entitled _Systeme des Animaux sans Vertebres_, which appeared in 1801.
Linne had divided all the animals below the vertebrates into two classes only, the Insecta and Vermes, the insects comprising the present classes of insects, Myriapoda, Arachnida, and Crustacea; the Vermes embracing all the other invertebrate animals, from the molluscs to the monads.
Lamarck perceived the need of reform, of bringing order out of the chaotic mass of animal forms, and he says (p.

33) that he has been continually occupied since his attachment to the museum with this reform.
He relies for his characters, the fundamental ones, on the organs of respiration, circulation, and on the form of the nervous system.

The reasons he gives for his classification are sound and philosophical, and presented with the ease and aplomb of a master of taxonomy.
He divided the invertebrates, which Cuvier had called animals with white blood, into the seven following classes.
We place in a parallel column the classification of Cuvier in 1798.
_Classification of Lamarck._ _Classification of Cuvier._ 1.Mollusca.

I._Mollusca._ 2.Crustacea.

II.