MEMOIR OF LAMARCK. 
53 
I. Apathetic Animals. 
1. Infusoria. 
2. Polypes. 
3. Radiarii. 
4. Vermes. 
( Epizoaires.) 
II. Sentient Animals. 
5. Insecta. 
6. Arachnidcs. 
7- Crustacea. 
8. Annelides. 
9. Cirrhipedes. 
10. Mollusca. 
III. Intelligent Animals. 
11. Pisces. 
12. Reptilia. 
13. Aces. 
14. Mammiferce. 
The animals of the first primary division he de- 
fines as destitute of feeling, and moving only hy 
their excited irritability ; and he assigns as their 
character, the absence of a brain and of an elongate 
medullary mass; senses wanting; forms various; 
articulations rarely existing. The animals of the 
second division feel, but they obtain from their sen- 
sations only perceptions of objects, a kind of simple 
ideas which they are unable to combine with each 
other in order to form complex ones. They possess 
no vertebral column, but have a brain and most 
frequently an elongate medullary mass ; some dis- 
tinct senses ; organs of motion attached under the 
