CUSPIDAEIA. 389 



Shell moderately convex; distinguished by the valves being 

 conspicuously turned to the right at tlie posterior extremity, 

 ■where they are slightly gaping, and by the posterior portion of 

 the shell being subrostrate, and having a slight fold continued 

 from the umbo to the post-ventral margin. 



Dimensions. — Height 13 mm. ; length 21 mm. 



Form, and Loc. — Eocene : Mornington, Victoria, 



L. 9861. Three examples of the right valve. Purchased. 



Family CUSPIDARIID^. 



Genus CUSPIDARIA, Nardo. 



[Ann. Sci. Lorabardo-Veneto, t. x. 1840, p. 49.] 



NecBra, J. E. Gray, in Griffith's "Animal Kingdom," voL xii. 1834, 

 pi. xxii. fig. 5 [non K.obineau-Desvoidy, 1830). 



Shell piriform, right valve smaller and less convex than the left ; 

 rounded and globose in front, rostrated and slightly gaping behind ; 

 hinge-teeth not constant, a small cardinal tooth sometimes occurs 

 in front of the spoon-shaped depression of the cartilage which is 

 internal, and whilst the posterior lateral tooth is generally well 

 developed on the right valve, it is obsolete on the left ; pallial 

 sinus small. 



Type. — Tellina cuspidata, Olivi. 



Cuspidaria subrostrata, Tate (sp.). 



1887 Neara stcbrosh-ata, Tate, Trans. Eoy. Soc. South Aust. vol. ix. p. 177, 

 pi. sv. figs. 2a-b. 



Shell ovate, moderately convex, thin ; much produced posterioily; 

 ventral margin sinuated in front of this rostral prolongation ; umbo 

 carinated, the keel being directly posteriorly, but it rapidly becomes 

 obsolete ; surface ornament consisting of coarse, concentric lines of 

 growth, lamellose at the umbo and rostral insinuation. 



Dimensions. — Eeight lOo mm. ; length 210 mm. 



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



L. 4810. Eight valve. Presented hy John Dctwanf, Efq. 



L. 9845. Specimens of both valves of the adult. Purchased. 



