526 REVISION OF THE AUSTRALIAN SPECIES OF BOLBOCERAS. 



at the summit; from the truncate summit three small blunt pro- 

 jections rise (the smallest of them in front, the two others of 

 equal size and placed behind transversely in such fashion that, 

 viewed obliquely from behind, each horn appears as a short erect 

 lamina bifid at its apex). I have not seen any Bolboceras likely 

 to be the female of this species. 

 W. Australia (Beverley). 



