THE HISTORy OF ZOOLOGY 



677 



and of its past inhabitants is to be explained by the action of the 

 causes seen in operation to-day, and not by invoking great 

 catastrophes or cataclysms by which changes of vast magnitude 

 were suddenly produced. He considered, also, that the trans- 

 formation of species took place by slow, orderly changes, Nature 

 requiring only matter, space, and time in order to effect her various 

 changes. He introduced the terms Vertebrata and Invertebrata, 

 and, in the same year as Treviranus (1802), proposed the term 

 Biology for the whole science of living things. 



Lamarck at first believed in a linear classification of animals, but 

 afterwards adopted the earliest known branching or phylogenetic 

 classification — a crude attempt, but interesting as being the first 

 of its kind. It is as follows : — 



Worms [flat and round Worms] 



Infusoria 



Polypes [including Rotifers, Polyzoa, 

 Aotinozoa, Crinoids, and some In- 

 fusoria] 



Radiaria [including Echinoderms and 

 some Worms and Coelenterates] 



./ 



Annelids [Annulata, &o.] 



Cirripedes 



Mollusca 



Insects 



Arachnids 



Crustacea 



rishea 

 Reptiles 



"Amphibious Mammals [Sirenia and 

 .Pinnipedia] 



\ Cetacea 



/ 



/ Ungulate Mammal* 



(Jnguiculate Mammals [Edentata, Rodentia, Marsupialia, Inseotivora, Garni vora, 

 Ohiroptera, and Primates]. 



