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(Rosaiiorhaiiiphns.) 



Beak sculpture generally zigzag- 

 radial; epidermis often bright. 



{Laiiiphorhamphus.) 



Beak sculpture radial, often curved;^ 

 shell dull colored. 



Family Mutelidse. 

 Hinge teeth taxodont ; male and female shells 

 alike; embryo a lasidiuiii. 



Nodularia Conrad. 

 Harmandia Rochebrune. 

 Grandidieria Bourguignat. 

 Fliysnuio Simpson. 

 Siiiipsonella Cockerell. 

 Pressidens Haas. 

 Pscudodon Gould. 

 Farreysia Conrad. 

 Ptychorhynchus Simpson. 

 Virgus Simpson. 

 Cristadeiis Simpson. 

 Rectideiis iSimpson. 

 Latiiellideus Simpson. 

 Trapezoideus Simpson. 

 Arconaia Conrad. 

 Pseudaincula Simpson. 

 Arcidopsis Simpson. 



Tctraplodoii Spix. 

 Castalina von Ihering. 

 Castaliella Simpson. 

 Colloiiaia Simpson. 

 Hyria Lamarck. 

 Prisodon Schumacher. 

 D'lplodon Spix. 



' Spatha Lea. 

 Mil tela Scopoli. 

 Chelidonopsis Ancey. 

 Brazzcca Bourguignat. 

 Arthropteron Rochebrune. 

 Pleiodon Conrad. 

 Mfliincoiidyhra d'Orbigny. 

 Iheringella Pilsbry. 

 fossula Lea. 

 Leila Gray. 



Aiiodoi'.titis BniQiiierc. 

 Mycetopioda d'Orbigny. 



