890 



Family PANDORID^. 



Genus MYADOE-A, Gray. 



[Ann. Nat. Hist. vol. iv. 1840, p. 306.] 



Shell equilateral, trigonal, rounded anteriorly, truncated pos- 

 teriorly, nacreous in the interior; left valve commonly flat, the 

 right convex ; cartilage pit narrow, median, internal, furnished 

 ■with a falciform projection placed between two divergent teeth; 

 pallial sinus small. 



Type. — Pandora hrevis, Sowerby. 



Myadora tenuilirata, Tate. 



1887. Myodora tenuilirata, Tate, Trans. Eoy. Soc. South Aust. vol. ix. 



p. 174, pi. xvii. figs. 'da-h. 

 1893. Myadora tenuilirata, Tate and Dennant, id. vol. xvii. pt. 1, p. 225. 



Hight valve convex, oblong; left valve flat; finely concentrically 

 ridged and radially striated, the last-mentioned feature being more 

 conspicuous on the left valve. 



Dimensions. — Height 9 mm. ; length 14"5 mm. 



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



L. 9910. Specimens of both valves. Purchased. 



Myadora australis, Johnston. 



1880. Myodora australis, Johnston, Pap. Eoy. Soc. Tas. 1879, p. 40. 

 1887. Myodora australis, Tate, Trans. Eoy. Soc. South Aust. vol. ix. p. 174, 



pi. xvii. figs. 10a-*. 

 1896. Myodora australis, Pritchard, Proc. Eoy. Soc. Vict. vol. viii. n.s. 



p. 140. 



Distinguished from M. tenuilirata by its shape, the right valve 

 being ovately oblong, and moderately convex ; whilst it is faintly 

 ridged from the umbo to the post-ventral angle, and has numerous 

 close concentric ridges ; left valve almost flat, it has minute radial 

 and fine concentric lineations. 



Dimensions. -^Hei^ht 12 mm. ; length 15 mm. 

 . Form, and Loo. — Eocene: Table Cape, Tasmania. 



L. 9913. Examples of the adult, both valves. Purchased. 



