73 



AUSTRALIAN GENERIC TYPES. 



The following genera are peculiar :— 

 Cephalopoda. — Tritaxeopus (1 sp.). 



Gastropoda. — Agnewia (1 sp.) ; Zemira (1 sp.) ; Pelicaria 

 (1 sp.), modified Struthiolaria, essentially New Zea- 

 landian ; Mesalia (1 sp.) ; Raulinia (1 sp.), the only- 

 living representative of a Parisian Eocene type ; Ampul- 

 larina (.3 sp.) ; Angasiella (1 sp.) ; Casella (1 sp.) ; 

 Allportia (1 sp.). 

 CoNCHiFERA. — HumpJireyia (.3 sp.), Myochmna (4 sp.), Anapa 

 (2 sp.), Ephippodonta (2 sp.). My sella (2 sp.), Trigonia 

 (5 sp.). 

 Palliobranchiata. — Atretia (1 sp.). 

 The following genera have their metropolis in the Australian 

 Province : — 



Gastropoda. — Cominella chiefly confined to the temperate 

 seas of the South Hemisphere ; Valuta, Australia pos- 

 sesses half the number of known species, whilst the 

 sections Amoria (10 sp.), Volutoconus (1 sp.), and 

 Mammilliaria (1 sp.) are restricted ; Phasianella is con- 

 spicuous by the large size attained by several of its 

 species which are individually of common occurrence. 

 Thalotia, Cantharidus, Menchus, Bankivia, and Crossea 

 are more largely represented specifically than in other 

 Provinces. 

 CoiffCB.iFERA.—Myodora, Zenatia, Chamostrea, Carditella, 

 Solenella, and Modiolarca are chiefly confined to the 

 cooler waters of the Southern Hemisphere, and the 

 same observation is equally applicable to the following- 

 genera of Palliobranchiata: — Kraussinct (2 sp.) and 

 Magasella (1 sp.). Of less restricted genera of Con- 

 chifera, Crassatella, Lwiopsis, and Anatina are con- 

 spicuous by the number of their constituent species. 

 The Indo- Australian Fauna presents in its generic assemblage 

 the characteristics of the widely-reaching Oriental Province, but 

 some few typical Australian genera are represented, as the 

 Volutes, Trigonia, Myochama, Modiolarca; whilst Parastrophia 

 and Watsonia, among Gastropods, and Austriella and Myrina, 

 among Conchifers, are peculiar ; also North Australia furnishes 

 the four known species of Placuna, two of which are endemic. 



The Terrestrial and Fluviatile Molluscan Fauna of 

 Australia. 



The terrestrial mollusca are in their species very locally dis- 

 tributed, but the genera are nearly all widely dispersed over warm 



