SUPPLEMENT 
ON 
THE EN TOZOA. 
THE reader will doubtless have remarked that the allocation 
of these animals among the zoophytes, or radiata, will admit 
of some controversy, inasmuch as they are neither plant-like 
nor radiated, and appear to have much more analogy with 
the annelides, which they would seem more properly to follow 
in the natural series. 
The study of the worms, which are entirely apodal, and 
which have no trace of appendages serving for locomotion, was 
pursued but little until the middle of the last century, and 
more especially that of such species as live continually in the 
interior of other animals. Attention to them seems to have 
been chiefly originated by a prize proposed by the Royal 
Academy of Sciences in Copenhagen. 
The ancients have scarcely noticed the round and flat 
worms, and that solely in a medical point of view, confining 
themselves to those which infest the human species. They 
have further limited their labours in this way to mere nomen- 
clature, without giving any external description. 
The few authors who occu; ied themselves with the history 
of the distinction of animals, previously to the revival of 
literature, have added but little to our acquaintance with this 
subject. From Isidore de Seville, Albertus Magnus, Belon, 
Nn2 
