98 



M. hordeacea resembleb M. inftms, of Singapore. 



M. muscarioides „ M. muicaria, of S. E. Australia. 



M. strombiformis ,, M. rnarguerita, of the West Indies. 



Then there are live species which are only distantly allied to, though 

 resembling certain living forms, because their essential points of diffe- 

 rence are less trivial than variation of shape ; these and their living 

 analogues are as follows : — 



Fossil Species. Recent Species. 



Outer lip of shell dentate. Outer lip smooth. 



- M. Wentworthi is the analogue to M. muscaria, S.E. Australia. 

 M. micula „ „ M. vitrea, W. Indies. 



Columella 5-plicate. Columella 4-plicate. 



M. Winteri is the analogue to M. bibalteata, W. Indies. 



M. propinqua „ „ M. Philippinarum, E. Indies. 



M. Woodsi ,, „ M.volutiformis, S.E. Australia. 



Analogous forms to certain other of our Tertiary fossils have been 

 indicated by McCoy and Duncan in the genera Voluta and Oyproza, and 

 among some of the corals and echinoderms. 



Our tertiary fauna, so far as it has been critically studied, shows an 

 affinity rather with the recent fauna of the East Indian and Chinege 

 Seas than with that of temperate Australia. However, this phenomenon 

 is not exhibited by the Marginellidfe, at least only in a very slight degree, 

 and their alliance is as strong with the West Indian and Australian 

 faunae. In respect to the West Indian fauna, it may be stated that it 

 possesses many points of affinity with that of the Miocene of Europe. 



