Vlll PREFACE. 



Cirripedia. To Mr. Conrad I am likewise indebted for 

 information and assistance. Both the celebrated Pro- 

 fessors, Milne Edwards and Miiller, have lent me, from the 

 great public collections under their charge, specimens which 

 I should not otherwise have seen. To Professor W. Dunker, 

 of Cassel, I am indebted for the examination of his whole 

 collection. I have, in a former publication, expressed my 

 thanks to Professor Steenstrup, but I must be permitted 

 here to repeat them, for a truly valuable present of a 

 specimen of the Anelasma squalicola of this work. I will 

 conclude my thanks to all the above British and foreign 

 naturalists, by stating my firm conviction, that if a person 

 wants to ascertain how much true kindness exists amongst 

 the disciples of Natural History, he should undertake, as I 

 have done, a Monograph on some tribe of animals, and 

 let his wish for assistance be generally known. 



Had it not been for the Ray Society, I know not how 

 the present volume could have been published ; and 

 therefore I beg to return my most sincere thanks to the 

 Council of this distinguished Institution. To Mr. G. B. 

 Sowerby, Junr., I am under obligations for the great 

 care he has taken in making preparatory drawings, and 

 in subsequently engraving them. I believe naturalists 

 will find that the ten plates here given are faithful de- 

 lineations of nature. 



In Monographs, it is the usual and excellent custom to 

 give a history of the subject, but this has been so fully 

 done by Burmeister, in his ' Beitrage zur Naturgeschichte 

 der Rankenfusser,' and by M. G. Martin St. Ange, in 

 his ' Mernoire sur 1' Organisation des Cirripedes/ that it 



