ON ANNELIDA. 
47 
ing those animals, as it also was at the same time in regard 
to the mollusca. 
Thus did M. Cuvier, by abandoning the views of Linnaeus, 
return to those of the ancient naturalists, such as Aldrovandus, 
Mouffet, and Ray, by comprehending in one and the same 
division, the insects and worms ; but he did more, by follow- 
ing, as he tells us himself, the ideas of Pallas, and uniting 
with his worms, the serpulae, the sabelhe, and in general all 
the chetopoda.' with tubes. 
Two years after this, M. Cuvier, in the tables which form a 
sequel to the first volume of his Lessons on Comparative 
Anatomy, introduced a slight modification into the classifica- 
tion of the w r orms, which he subsequently carried farther. 
This consisted in comprehending under this name, in a defini- 
tive manner, only the chetopoda and apoda, which exist ex- 
ternally, the others, or the intestinal worms, being thrown 
into a sort of incertci sedes, with a view to a new order. As 
for the first, they are divided according as they have external 
organs of respiration or not ; and the second, according as 
they are provided w ith lateral setae, or destitute of them. In 
the first, are all the chetopoda, lumbrici excepted; in the 
second, those last animals, nais and thalassema, (now a 
zoophyte) and in the third, the hirudines, the planarise, and 
even the fascioli, which are nevertheless intestinal animals. 
In 1802 , in a particular memoir read at the Institute, M. 
Cuvier, in giving his observations on the organization of the 
chetopoda, proposed to designate them as a class, by the 
name of red-blooded worms, comprehending in it the hirudines 
and lumbrici, without observing that the most common and 
thickest species of our seas has not the nutritive fluid of a red 
colour. 
A short time after this, M. de Lamarck, determined most 
probably by the consideration put forth by Cuvier, also made 
