350 KTJCUIANA. 



dorsal margin the concentric striae are commonly bolder than 

 on any other part of the shell ; lunule inconspicuous, elongate. 



Dimensions. — Height 4-5 mm. ; length 8 mm. 



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



L. 9821. Several specimens of both valves. Purchased. 



Nuculana apiculata, Tate (sp.). 



1886. Leda apiculata, Tate, Trans. Eoy. Soc. South Aust. vol. viii. p. 131, 



pi. ix. figs. 4a-i. 

 1893. leda apiculata, Tate and Dennant, id. vol. xvii. pt. 1, p. 224. 

 1895. Leda apiculata, Tate and Dennant, id. vol. xix. pt. 1, p. 112. 



Shell ovate - subtrigonal, ventricose ; gradually acuminately 

 rostrated ; umbones moderately inflated ; posterior dorsal area 

 depressed, but slightly elevated at the extremity ; surface carrying 

 numerous small concentric threads ; lunule distinct. 



Dimensions. — Height 5 mm. ; length 8 mm. 



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



L. 9826. Several examples of both valves. Purchased. 



Nuculana leptorhyncha, Tate (sp.). 



1886. Leda leptorhyncha, Tate, Trans. Eoy. Soc. South Aust. vol. viii. p. 131, 

 pi. X. figs. ba-h. 



This species is not unlike the young of N. apiculata, from which, 

 however, it differs by the contraction and compression beneath 

 the rostral prolongation, and by its irregular sculpturing. 



Dimensions. — Height 3 mm. ; length 5 mm. 



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



L. 9824. Several examples. Purchased. 



Nuculana crassa, Hinds (sp.). 



1843. NucMla crassa. Hinds, Proc. Zool. Soc. p. 99. 

 1871. Lccda crassa, Sowerby, Conch. Icon. vol. xvui. pi. v. fig. 27. 

 1877. Leda crassa, Angas, id. p. 193. 



1885. Leda crassa, E. A. Smith, Voy. " Challenger," Zool. vol. 

 LameUibranchiata, p. 237. 



