214 



Trivia australis, Lamarck (sp.). 



1822. Cyprma australis, Lamarck, Hist. Nat. Anim. sans Vert. t. vii. p. 404. 



1828. Trivia australis, Gray, Zool. Journ. vol. iii. p. 570, sp. 108. 



1834. Cyprcea australis, Quoy and Gainiard, Voy. de I'Astrolabe, Zool. t. iii. 



p. 48, pi. xlviii. figs. 19-26. 

 1846. Cyprma australis. Reeve, Conch. Icon. vol. iii. pi. sxiv. fig. 138. 

 1867. Trivia australis, Angas, Proc. Zool. Soc. p. 206. 

 1881. Cyprcea australis, WeinkauS, Conch. Cab. (ed. Kuster), p. 142, 



pi. sxxix. figs. 14, 15. 



1885. Cyprma {Trivia) australis, Roberts, iw Tryon, Manual of Conchology, 



vol. vii. p. 206, pi. xxiii. figs. 53, 54. 



1886. Ctjpraa {Trivia) australis, "Watson, Voy. "Challenger," Zool. 



(Gasteropoda), vol. xv. p. 427. 



Ovate, slightly narrowed in front, thin; costse prominent near 

 the aperture, nearly obsolete o^n the centre- of the dorsal surface, 

 or, in some specimens, the costae are much reduced in size on that 

 area ; aperture narrow, curved at both extremities ; columella 

 flattened, deeply excavated in front ; outer margin thickened. 



Dimensions. — Length 13'5mm.; breadth 10 mm. 



Form, and Loc. — Post-Pliocene : Limestone Creek, Glenelg river, 

 Victoria. 



G. 5564. Three examples of the adult. Purchased. 



Genus ERATO, Eisso. 



[Hist. Nat. Eur. Merid. t. iv. 1826, p. 240.] 



Shell ovoid, or pyriform ; spire conical ; aperture narrow ; outer 

 margin denticulate ; columellar border with small plications an- 

 teriorly ; canal notch-like, broad. 



The similarity of the animal of Erato, including its radula, to 

 Trivia precludes the possibility of classifying the genus with the 

 Maeginellid^, as is frequently done by authors. As Dr. Paul 

 rischer' observes, it may readily be separated conchologically from 

 Marginella from the method of development of the columellar 

 plications. 



Type. — Cyprcea cyprceola, Brocchi. 



1 Manuel de Conchyl. 1884, p. 668. 



