192 LAMARCK, HIS LIFE AND WORK 
certain of them closely approach them in some re- 
spects, they have a special character which compels 
us to separate them. In short, in the genera best 
known the feet of these animals are distinctly articu- 
lated and even crustaceous (crustacés).”’ He does not 
refer to the nervous system, but this is done in his 
next work. It will be remembered that Cuvier over- 
looked this feature of the jointed limbs, and also the 
crustaceous-like nervous system of the barnacles, and 
allowed them to remain among the molluscs, notwith- 
standing the decisive step taken by Lamarck. It was 
not until many years after (1830) that Thompson 
proved by their life-history that barnacles are true 
crustacea, 
In the Philosophie zoologique the ten classes of the 
invertebrates are arranged in the following order: 
Les Mollusques. 
Les Cirrhipedes. 
Les Annelides. 
Les Crustacés. 
Les Arachnides. 
Les Insectes. 
Les Vers. 
Les Radtatres. 
Les Polypes. 
Les Infusotres. 
At the end of the second volume Lamarck gives 
a tabular view on a page by itself (p. 463), showing his 
conception of the origin of the different groups of 
animals. This is the first phylogeny or genealogical 
tree ever published. 
