A Eevised Classification of the Tunicata, with Definitions of 

 the Orders, Suborders, Families, Subfamilies, and Grenera, 

 and Analytical Keys to the Species. By "W". A. Heedman, 

 D.Sc, r.L.S., Professor of Natural History in University 

 College, Liverpool. 



[Read 6th February, 1S9L] 



DuEiNG the three years which have elapsed since the last part 

 of the report upon the Tunicata collected during the ' Chal- 

 lenger' Expedition was written, I have had opportunities of 

 examining, more or less in detail, many large collections of Tuni- 

 cata from various parts of the Avorld, including especially three 

 important series of specimens from Australian seas which are 

 now in my laboratory, viz. : — the collection of the Australian 

 Museum, Sydney (from which I am drawing up a Museum Cata- 

 logue) ; a collection made by Mr. Bracebridge Wilson in the 

 neighbourhood of Port Phillip, and sent to me for description by 

 Prof. Baldwin Spencer ; and, lastly, the collection made by Prof. 

 Haddon in the Torres Straits. I have also been able to make a 

 number of observations from the living animals on various parts 

 of our own and the French coasts. Consequently I feel that I 

 am in a position now to revise the classification put forward in 

 the ' Challenger ' Eeport, to deal with those few genera not in- 

 cluded in that work and those described since 1888, and to 



