FRESnWATEU STEELLS OF ATTSTTIALTA. 311 



narrow anteriorly like that species. The bifid cardinal tooth of 

 the right valve, remarked upon by Grould, appears to be a cha- 

 racter common to most of the Australian species of this genus. 



143. Unio Danellti, Villa. 



Unio Danellii, Villa, Jovrn. de Conch. IS/lj vol. xix. p. 328. 



Hah. Brunswick, S. Australia (Villa) ; Tarra Eiver, Yictoria 

 (Crosse, I. c. p. 329). 



This species is known to me only by a brief diagnosis. It may 

 be a form of U. amhiguus. 



144. Unio Shuttlewokthi, CJiarpentier. 



Unio Shuttleworthii, Ckarpentier, Kuster's ConcJi.-Cab. Lieferung 147, 



1855, explanation of plates on cover, pi. xliv. fig. 2. 

 Unio Shuttleworthii, Kitster, description I. c, Lieferung 150, 1856, 



p. 152. 

 Sab. New Holland, 



This species appears to be very closely allied to the IT. am- 

 higuus, Parreyss, but differs chiefly in being proportionally much 

 narrower in front. 



145. Unio Jeeeeetsianus, Lea. 



Unio Jeffreysianus, Lea, Journ. Acad. Nat. Sci. Philad. vol. viii. 18/4, 

 p. 23, pi. vii. fig. 20. 



Hah. Australia. 



The remarkable peculiarity of this species consists in the lateral 

 teeth in both valves being single. In all other respects it agrees 

 with Z7. amhiguus. One specimen of the latter in the British 

 Museum has this irregulai'ity. It is the largest example^ and is 

 stated to have been found at Melbourne. 



146. Unio Wilsonii, Lea. 



UnioWilsonii, Lea,Proc.Acad. Nat. Sci.Philad. 1859, p. 153 ; id. Journ. 

 Acad. Nat. Sci. Philad. ser. 2, vol. iv. p. 256, pi. xl. fig. 137 ; Reeve's 

 Con. Icon. fig. 472 (Lea's figure reversed). 

 Hah. "Eastern branch of Isaac's plain, New South "Wales." 

 — Lea. 



147. Unio Stuaeti. 



Unio (Alasmodon) Stuarti, A. Adams S)- Angus, Proc. Zool. Sac. 1863, 



p. 417; Reeve's Con. Icon. pi. xliv. fig. 279, pi. xlv. fig. 279 a. 

 Anodon Stuarti, Sowerby, Reeve's Con. Icon. fig. 136 a-b. 

 Hah. Lagoon near Mt. Margaret, Central Australia (Angas) ; 

 Umbum, forty miles south of Peake (J". Chandler). 



