391 



Myadora corrugata, Tate. 



1887. Myodora corrugata, Tate, Trans. Eoy. Soc. South Aust. vol. ix. p. 173, 

 pi. xvii. figs. Wa-h. 



In this species the right valve is ovate and convex ; with hut few, 

 distant concentric ridges on the exterior ; left valve flat. 

 Dimensions. — Height 14 mm. ; length 17 mm. 

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

 L. 4809. Two examples of the left valve. 



Presented by John Dennant, Esq. 



L. 9911. Specimens of both valves. Purchased. 



Myadora praelong:a, Tate. 



1887. Myodora pr(elonga, Tate, Trans. Roj-. Soc. South Aust. vol. ix. 

 p. 173, pi. 3UX. figs, \2a-d. 



Readily distinguished from other species of Myadora here alluded 

 to, in that the shell is suLinequivalve and elongate. The author 

 remarks that the anterior side is five times as long as the posterior, 

 and the shell as a whole is broad. In its congener M. avgustior, 

 Tate, the anterior side is not much longer than the posterior, 

 and the shell is very narrow. 



Dimensions. — Height &b mm. ; length ITS mm. 



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



L. 9912. Series illustrating stages of growth. Purchased. 



