PREFACE. 



The two following plates continue the illustrations of our 

 Polyzoa contributed by Dr. MacGillivray to the National Museum 

 and this work. 



The succeeding Decades will illustrate as many different genera 

 as possible, and will deal first usually with species of some special 

 interest, and of which good figures do not exist, or are not easily 

 accessible. 



Frederick McCoy. 

 11th December 1882, 



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