ON ANNELIDA. 43 



the intestinae, and the earth-worms, while the chetopoda were 

 considered as insecta. Ray, whose method is very rigorous, 

 divides his insecta, which comprehend all articulated ani- 

 mals, into insects which do not undergo metamorphosis, and 

 those which do. The first section is divided into apoda and 

 pJioropoda. The division apoda comprehends the worms 

 which live in the earth, as the lumbrici ; those which inhabit 

 the bodies of animals, as the intestinae ; and those which live 

 in the water, as the fresh-water and sea-leech, &c. He ob- 

 serves, that among the terrestrial species, most authors range 

 the limaces, whether naked or conchyliferous. The group of 

 phoropoda, is then divided according to the number of feet, 

 into hexapods, octopods, tetradecapods, and polypods. In this 

 last section, under the name of terrestria, come the Juli, and 

 the true Scolopendrae ; and in the aquatic division the sea- 

 scolopendrcB, or nereides. 



In the first edition of the Systema Naturce, Linnaeus ex- 

 tended the term vermis to all animals that were not mam- 

 malia, birds, reptiles, fishes, or insects, and consequently to 

 mollusca,wdiether naked or shelled, and to zoophytes ; but he 

 excluded the insect-worms of Ray, from his class vermis. 

 This class was then divided into four orders : 1. Reptilia, for 

 the intestinal worms, comprehending, however, the leeches 

 and lumbrici ; 2. Zoophyta for the chetopoda, or setigerous 

 annelida, the naked mollusca, the medusae, and the echino- 

 dermata ; 3. Testacea^ for the conchyliferous mollusca, com- 

 prehending, however, the ascidiae, under the name of micro- 

 cosmus ; 4. and last, the Lithopthyta, for the madrepores and 

 serpulaceae. 



After this first essay, appeared the genera Amphitrite nereis, 

 and aphrodita, which belong to the chetopoda. In subse- 

 quent editions of Linnaeus, the name intestincB, was substi- 

 tuted for reptilia, for the first order. The denomination 



