INTRODUCTION. 

Tuer object of this Catalogue has been to give a complete dist 
of all the Species of Intestinal Worms contained in the Collection 
of the British Museum, with their synonyms, the animals in 
which they were found, and the source from whence they have 
been derived. The arrangement followed is that of M. Dujardin, 
who has paid much attention to this class of animals. 
The basis of the Collection was a series of specimens named 
by, and procured from, M. Siebold, of Berlin. 
This Catalogue has been prepared, and the new Species de- 
scribed, by Dr. Baird. 
JOHN EDWARD GRAY. 
BrivTIsH Musrum, 
May 18th, 18538. 
