rRESH-WATEK SHELLS OE ATTSTTIALTA. 307 



young sliell forming a more or less distinct apical cap. Concen- 

 tric stripe very tiue. 



Width eimillim., length 5^ diam. ^. 



Eal. Tan-Tean Beservoir, Plenty District, Victoria, South 

 Austrnlia {B. Etheridge). 



Not unlike the European P. casertanim, hut rather less inequi- 

 lateral. 



Genus UjStio. 



Chronological List of described Species. 



1818. Unio australis, Lamarck. 



„ depressus, Lamarck. 



1834. novse-liollandiffi, Gray. 



1842. gratiosus, Parreyss. 



1843. cucumoides, Leff,= novae-hollandise. 



1848. ambiguus, Parreyss. 



„ multidentatus, Parreyss. 



„ fulmineus, Parj-eyss, = multidentatus, var. 



1850. nepeanensis, Conrad. 



„ cidtelliformis, Conrad,= depressus. 



„ halonnensis, Conrad,=- ambiguus. 



,, profugus, Goidd. 



1852. Cumi'iigianus, Dunker,= novse-hoUandise. 



1855. Lessoni, Kiister, = nepeanensis. 



„ rugulosus, Charpentier. 



„ Shuttlewortlii, Charpentier. 



1856. Shidtleicorthi, L6a,= Angasi. 



1859. mutabilis, Lea,= depressus. 



5, vittatus, Lea, = ambiguus. 



,, Wilsonii, Lea. 



1861. philippianus, Kiister, = ambiguus. 



1862. semiplicatus, Xiister. 



1863. Stuarti, Adams S,- Angas. 



1864. Evansi, Adams Sf Angas. 



1865. moretonicus. Reeve, = australis, var. 



1867- Angasi (Lea), Reeve. 



1871. Danellii, Villa. 



1874. JefFreysianus, Lea. 



138. Ukio Angasi, Lea. 



Unio Shuttleworthii, Lea (non Charpentier), Proc. Acad. Nat. Sci. 

 Philad. 1856, p. 94; id. Journ. Acad. Nat. Sci. Philad. 1858, vol. iii. 

 p. 304, pi. xxviii. fig. 19 ; Reeve's Conchol. Icon. fig. 167. 



Unio Angasi, Lea, MS. ; Reeve's Con. Icon. fig. 282. 



Anodon Angasii, Sowerby, Con. Icon. fig. 127. 



Hah. Balonue Eiver, Brisbane Eiver, and Eiver Isaacs (Brit. 

 Mils.); Strangeways Eiver, IST. Australia {Angas). 



This, the largest of the Australian species, is veiy elongate 

 transversely, although in this respect it is subject to considerable 



