DIPLODONTA. 375 



Chione propinqua, Tenison-Woods. 



1877. Ch'one propinqua, Teuison-Woods, Pap. Eoy. Soc. Tas. 1876, p. 113. 

 1887. Chione propinqua, Tate, Trans. Roy. Soc. South Aust. vol. ix. p. 157, 



pi. xiv. figs. 7, 8. 

 1893. Chione propinqua, Tate and Dennant, id. vol. xvii. pt. 1, p. 225. 

 1896. Chione propinqua, Pritchard, Proc. Roy. Soc. Vict. vol. viii. n.s. 



p. 135. 



Shell transversely oval ; surface •with closely-set concentric 

 ridges, lamellar at the extremities, which are finely radially 

 lineated, the latter feature being most conspicuous between the 

 ridges ; pallial line near the margin, sinus rather shallow. 



Mr. G. B. Pritchard [op. cit.) is of opinion that the Victorian 

 fossils described by Professor Tate under this name are specifically 

 distinct from the Table Cape shell on which Tenison-Woods 

 founded C. propinqua. The materials at the writer's disposal are 

 not such as to enable him to express an opinion on the subject. 



Dimensions. — Height 18 mm. ; length 23 mm. 



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



L. 4829. Examples of both valves. 



Presented hy John Dennant, Esq. 



L. 9883, L. 9885. Several specimens; from both horizons. 



Purchased. 



Family UNGULINID^. 



Genus DIPLODONTA, Bronn. 



[Ital. Tert. 1831, pp. ix.-xii.] 



Shell inequilateral, suborbicular, smooth, or concentrically 

 striated; hinge having two cardinal teeth on each valve; ligament 

 external ; pallial line simple ; no lunule. 



Type. — Venus lupinus, Brocchi. 



Diplodonta subquadrata, Tate. 



1887. Diplodonta fuhquadrata, Tate, Trans. Roy. Soc. South Aust. vol. ix. 



p. 147, pi. xiv. figs. lOrt-i. 

 1893. Diplodonta subquadrata, Tate and Dennant, id. vol. xvii. pt. 1, p. 225. 

 1896. Diplodonta subquadrata, Pritchard, Proc. Eoy. Soc. Vict. vol. viii. 



N.s. p. 133. 



