156 AUSTRALIAN SPONGES DESCRIBED BY CARTER. 



As the configuration of the canal system is not described and the 

 microscopic structure of the soft parts generally hardly referred to, 

 and as these are considered all-important by me, it is only natui'al 

 that I should not be able to utilize Carter's Essay. Just as it was 

 necessary that O. Schmidt compared Bowerband's species with his 

 own I find it advantageous to review Carter's essay from my point 

 of view, so that anyone may be enabled to make use of it. To 

 those who hold the views of PolejaefF, Vosmaer and myself, this 

 review will be most welcome. As I am in possession of extensive 

 collections and working the subject on the spot, I have thought 

 myself in a position to write this review. 



