Gastropod gill morphology B 
morphology of the investigated species are summarized in Table 2. The external ultrastructure of the 
investigated caenogastropod species showed basic uniformity, as did the gills of the limpet P. mimula 
and neritid N. chameleon, representatives of the Patellogastropoda and Neritimorpha respectively. 
The gill ultrastructure of the vetigastropod trochid A. constricta showed the least similarities with 
the ultrastructure of the gills of the other species investigated. 
Acknowledgements 
I wish to thank Drs T.S. Hailstone and J. Healy for their comments on the manuscript, and Mrs L. 
Daddow for her advice on the electron microscopical work. I thank the University of Queensland for 
granting me the F.J. Meade Scholarship. 
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