MEMOIR OP LAMARCK. 



53 



I. Apathetic Animals. 



1. Infusoria. 



2. Polypes. 



3. Radiarii. 



4. Vermes. 

 (Epizoaires.) 



II. Sentient Animals. 



5. Insecta. 



6. Arachnides. 



7. Crustacea. 



8. Annelides. 



9. Cirrhipedes. 

 10. Mollusca. 





III. Intelligent Animals. 



11. Pisces. 



12. Reptilia. 



13. ^4^5. 



14. Mammiferce. 



The animals of the first primary division he de- 

 fines as destitute of feeling, and moving only by 

 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 



