Xll NOTE TO SECOND EDITION. 



to leave this posthumous edition of his translation of Milne 

 Edwards's work in the form in which Dr. Knox would have 

 desired it to appear, had he survived, and therefore, with 

 the exception of a few cases, in which an error of fact had 

 been inadvertently passed over, I have left the manuscript 

 untouched. 



The present edition differs from the preceding by the intro- 

 duction of some graphic sketches by one of- Dr. Knox's most 

 distinguished pupils, the late Professor Edward Forbes. 



Two Tables of Zoological Classification are appended, and 

 a Glossary, which it is thought may prove useful, has been 

 incorporated with an Index, which has been added for the 

 first time, in this edition. 



C. C. B. 



