PEEFAGE TO THE ENGLISH TRANSLATION, 



r UNDERTOOK the translation of Professor Glaus' excellent 

 * " Lehrbuch der Zoologie " with a view of supplying the 

 want, which has long been felt by teachers as well as students 

 in this country, of a good elementary text-book of Zoology. 

 Professor Glaus' works on zoology are already well known in 

 this country ; and I think it will be generally admitted that 

 they take the first place amongst the zoological text-books 

 of the present day. 



It has been decided to publish the English translation 

 in two volumes. The second volume, which begins with 

 Mollusca, is in the press, and will, I trust, appear early in 

 the autumn. 



The German has been, with one or two unimportant 

 exceptions, closely followed throughout. These exceptions, 

 and the few additions which I have thought it necessary to 

 make, have in all cases been indicated by enclosure within 

 brackets. 



I must ask the indulgence of the reader towards the errors 

 and deficiencies of this translation. I trust that they will be 

 found to be neither numerous nor important. I have to thank 

 Mr. Heathcote for the assistance he has given me in the 

 laborious work of translation. I am also indebted to Professors 

 Newton and Foster, Dr. Gadow, and Mr. W. Heape for advice 

 and assistance. 



ADAM SEDGWICK. 



TRINITY COLLEGE, CAMBRIDGE, 



1884. 



