377 



•with one anterior lateral tooth, two cardinal teeth the posterior 

 of which is bifid, and one short posterior tooth ; the left valve 

 has an obsolete anterior lateral tooth, two divergent cardinals 

 (between which a smaller tooth occasionally occurs), and one 

 posterior lateral tooth ; pallia! sinus rounded, very deep. 

 Type. — Bonax trunculus, Linuffius. 



Douax dixoni, Tate. 



1887. Doiifix dixoiii, Tate, Trans. Eoy. Soc. South Aust. vol. is. p. 168, 

 pi. xvi. fig. 15. 



Shell triangularly ovate, suhequilateral ; surface having broad, 

 flatly rounded, radial costaj, interrupted by concentric strias and 

 grooves ; ventral margin coarsely crenulated. 



Dimensions. — Height 8 mm. ; length 11 mm. 



Form, and Loc. — Eocene : Muddy Creek, Victoria. 



L. 9877. Examples of both valves. Purchased. 



Family GAllIID^. 



Genus GARI, Schumacher. 



[Essai Xouv. Syst. Habit. Testaces, 1817, p. 131.] 



Psammolia, Lamarck, Hist. Nat. Anim. sans Yert. t. v. 1818, p. 511. 



Shell transversely elongated, suhequilateral; anterior margin 

 rounded ; posterior margin generally subtruncate and angulate ; 

 hinge of the right valve liaving two bifid teeth, the posterior being 

 the larger; of the left, two teeth, of which the anterior is the 

 largest, bifid, whilst the posterior is oblique ; pallial sinus deep. 



Type. — Tdlina gari, Liuuasus. 



Gari hamiltonensis, Tate (sp.). 



1 88.5. Psammohia hnmiUonetins, Tate, Southern Science Record, January, p. 4. 

 1887. Tsammobia hainiltonciisis, Tate, Traus. Eoy. Soc. South Aust. vol. Lx. 

 p. 167, pi. xvi. fig. 13. 



Shell narrower, more attenuated anteriorly and less abruptly 

 truncated posteriorly than G. tontdis, Lamarck, from which it 



