362 CAEDITELLA, 



Genus CARDITELLA, E. A. Smith. 

 [Proc. Zool. Soc. 1881, pp. 42, 43.] 



Shell trigonal, equilateral ; carrying two cardinal teeth on the 

 left valve and one on the right ; each valve has two lateral teeth, 

 one nearly marginal on the one side, the other on the opposite side 

 being well within the outer edge, with a groove between it and 

 the margin for the reception of the submarginal tooth of the other 

 valve ; pallial line simple. 



Type. — Carditella pallida, Smith.* 



Carditella lamellata, Tate (sp.). 



1886. Gouldia lamellata, Tate, Trans. Roy. Soc. South, Aust. vol. viii. p. 148, 



pi. ii. fig. 17. 



1887. Carditella lamellata, Tate, id. vol. ix. p. 188. 



Distinguished by its depressed, triangular form, with much pro- 

 duced acute umbo and rounded ventral margin ; surface ornamented 

 by several conspicuous concentric lamellae and growth-lines, in 

 some individuals set closely together, in others far apart. 



Dimensions. — Height 4'5 mm. ; length 4'5 mm. 



Form, and Loc. — Eocene : Aldinga, South Australia. 



L. 9879. Several examples of the neanic and ephebic stages of 

 growth. Purehased. 



Carditella radiata, Tate (sp.). 



1886. Micromeris radiata, Tate, Trans. Eoy. Soc. South Aust. vol. viii. 



p. 148, pi. X. fig. 12. 



1887. Carditella radiata, Tate, id. vol. ix. p. 188. 



1893. Carditella radiata, Tate and Dennaut, id. vol. xvii. pt. 1, p. 225. 

 1895. Carditella radiata, Tate and Dennant, id. vol. xix. pt. 1, p. 113. 



Shell trigonal, slightly convex ; umbones produced ; inner margin 

 distantly crenulated; surface smooth, radially ribbed, concentrically 

 ridged, or coarsely striated ; there is a deep elliptical depression 

 anterior and posterior to the umbones. 



Dimensions. — Height 4*5 mm. ; length 4*5 mm. 



Form, and Loc. — Eocene : Aldinga, iSouth Australia. 



L. 9878. Specimens of the adult, both valves. Purchased. 



1 Voy. "Challenger," Zool. LameUibranchiata, vol. xiii. p. 216. 



