ON ANNELIDA. 
43 
the intestinae, and the earth-worms, while the chetopoda were 
considered as insecta. Hay, 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 
phoropoda . 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 Scolopendrm ; and in the aquatic division the sea - 
scolopendres , or nereides. 
In the first edition of the Systema Natures , Linnaeus ex^ 
tended the term vermis to all animals that were not mam- 
malia, birds, reptiles, fishes, or insects, and consequently to 
mollusca, whether 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. ReptUia , for 
the intestinal worms, comprehending, however, the leeches 
and lumbrici ; 2 . Zoopliyta 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 ascidia3, under the name of micro- 
cosmus ; 4 . and last, the Litliopliyta , for the madrepores and 
serpulaceac. 
After this first essay, appeared the genera Amphitrite nereis , 
and aphrodita , which belong to the chetopoda. In subse- 
quent editions of Linnaeus, the name intestines , was substi- 
tuted for reptilia , for the first order. The denomination 
