yi. PREFACE. 



As some of the earlier plates had to be printed off before 

 their exact position in the series could be determined, I 

 decided to treat each family separately in the numbering ; 

 hence the legends on the plates run Clav. I., Asc. I., Bot. I., 

 II., III., and so on. A complete list of the plates in their 

 order is given on p. 122. 



Finally, I desire to state that this work is merely a 

 descriptive catalogue, and, although I have tried to make it 

 as complete and as useful as possible, I do not expect it to 

 be regarded as a monograph on Australian Tunicata. I 

 was expressly requested by the Trustees not to enter into 

 anatomical and histological details beyond what I considered 

 necessary for the elucidation of the systematic position and 

 the sufficient description of the various species, and not to 

 treat in any detail of species outside of the collection sent 

 to me from the Museum. I have added, however, at the 

 end of the catalogue a complete list of the Tunicate Fauna of 

 Australian seas so far as it is known to me ; and I have 

 given in the Introduction a brief general account (illustrated 

 by Plates A, B, and C) of the structure and life-history of a 

 typical Ascitlian which may be useful to those who study the 

 catalogue. 



W. A. HERDMAN. 



LIVERPOOL, 



January, 



