202 



localities are so adjacent that I have placed the species from 

 both of them together. An asterisk has been attached to 

 those which are found in South Australian waters, so that 

 at a glance the proportion of species common to the two 

 regions can be noted. 



Of the 150 shells identified in this list, 108 are found in 

 South Australia. Of the 12 shells not named, 4 are almost 

 certainly found there, and possibly three others, or 112 pro- 

 bably, and 115 possibly among 162; that is, 71 per cent. 

 These are, of course, the most common shells, and if the same 

 ratio holds with the rare species, nearly three-fourths of the 

 marine mollusca will be common to the two far distant locali- 

 ties. The proportion of 71 per cent, applies to the Pelecypods 

 and to the Gasteropods alike. 



*Spirula spirula, Linne, 1758, Nautilus. 



Cadulus occiduus, Verco, 1912. 



Cryptoplax, sp. 



Patella neglecta, Gray, 1827. 

 "^Nacella parva, Angas, 1878. 

 *Acmaea alticostata, Angas, 1865, Patella. 

 ~ x "Acmaea septiformis, 1834, Patelloidea. 

 "*Aemaea crucis, Tenison-Woods, 1877. 

 "*Acm3sa polyactina, Verco, 1912. 



Acmaea patella-vecta, Verco, 1912. 

 *Haliotis roei, Gray, 1827. 

 ~*Megatebennus omicron, Crosse and Fischer, 1864, 



Fissurella. 

 *Macroschisma tasmaniae, Sowerby, 1866. 

 *Gena nigra, Quoy and Gaimard, 1834, Stomatella. 

 ~*Turbo jourdani, Kiener, 1839. 

 ~*Turbo stamineus, Martyn, 1784, Limax. 



Turbo pulcher, Reeve, 1842. 



Turbo ticaonicus, Reeve, 1842. 

 ^Astralium fimbriatum, Lamarck, 1822, Trochus. 



Astralium stellare, Gmelin. 

 ^Phasianella australis, Gmelin. 



*Phasianella ventricosa, Quoy and Gaimard, 1834. 

 -*Phasianella variegata, Lamarck, 1822. 

 *Phasianella rosea, Angas, 1867, Eutropia. 



Phasianella, sp. 

 *Cyclostrema tatei, Angas, 1878. 



Trochus obeliscus, Gmelin. 

 "*Clanculus plebeius, Philippi, 1846, Trochus. 

 *Monodonta melanloma, Menke, 1843. 



Monodonta (Chlorodiloma) zeu§, Fischer, 1874, Trochus. 

 *Cantharidus lehmanni, Menke, 1843, Trochus. 



