MERETEIX. 371 



Meretrix eburnea, Tate (sp.). 



1887. Cythcrca ehiirnea, Tiite, Traus. Roy. Soc. Soutb Aust. vol. i.^. p. 160, 



pi. xviiL fig. 7. 

 1893. Cytherea eburnea, Tate and Dennant, id. vol. xvii. pt. 1, p. 225. 



Allied to M. suhmiiltistriata, but is more tumid, oval in form, 

 rounded, and not acuminate posteriorly ; surface smooth, interrupted 

 by irregular concentric lines of growth. 



Dimensions. — Height 19 mm. ; length 23 mm. 



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



L. 9892. Series illustrating stages of growth. Purchased. 



Meretrix tenuis, Tate (sp.). 



1887. Cytherea tenuis, Tate, Trans. Roy. Soc. South Aust. vol. ix. p. 159, 



pi. xiv. fig. 16. 

 1893. Cytherea tennis, Tate and Dennant, id. vol. xvii. pt. 1, p. 225. 



1895. Cytherea tenuis, Tate and Dennant, id. vol. xix. pt. 1, p. 113. 



1896. Cytherea tenuis, Pritchard, Proc. Eoy. See. Vict. vol. viii. n.s. p. 135. 



Shell thin, fragile, narrow anteriorly, produced, but truncated 

 posteriorly ; umbo incurved, situated at about one-fourth of the 

 whole length from the anterior margin ; ventral margin arcuate ; 

 surface shining, finely concentrically striated ; pallial sinus large, 

 broad and deep. 



Dimensions. — Height 15 mm. ; length 20 mm. 



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



L. 9893. Examples of both valves. Furchased. 



Meretrix, sp. 



L. 10586. Several casts of a species allied to AT. sulmultistriata, 

 but much larger and more compressed ; from Willunga, South 

 Australia. H. Y. L. Drown Coll. 



48803. Casts of a large species, too imperfect for determination 

 specifically ; from Eiver Murray cliffs, South Australia. 



Preseiited hy Commodore Goodenough, F.N. 



L. 5645. Several casts of a very tumid species ; from Sale, 

 Gippsland. Presented by the Fev. J. S. H. Royce. 



L. 10589. Internal cast of left valve ; from the Lower Tertiary 

 of Ardrossan, Yurke's Peninsula, South Australia. 



R. Y. L. Brown Coil. 



