vi COMPARATIVE ANATOMY 



our translation owes much of the value it may possess for the English 

 student. 



In the use of certain technical terms we have given the English 

 or the Latin form indifferently, e.g. pinnule or pinnula, auricle or 

 auricula, with deliberate inconsistency. On the other hand, we have 

 throughout used the terms madreporite, madreporitic, and Echinoder- 

 mata, although some authorities are more in favour of madrepore, 

 madreporic, and Echinoderma. We feel it our duty to call the atten- 

 tion of students to these points. 



The following author's preface is a free translation of the 

 Nachwort which appeared at the end of the fourth German part. 

 In it the author answers the only serious charge against the work 

 as a text-book which has been brought to our notice. It finds its 

 most appropriate place as a preface to the second volume of the 



translation. 



H. & M. BERNARD. 



