PREFACE. 



The four following plates continue the illustrations of our 

 wonderfully rich Polyzoan Fauna contributed by Dr. MacGillivray 

 to the National Museum and this work, in which many of them 

 are figured for the first time. 



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. 



25th August 1881. 



[5] 



