Genus NISO, E,isso. 

 [Hist. Nat. Eur. Merid. t. iv. 1826, p. 218.] 



This genus is readily distinguished from Eulima by its large 

 and deep umbilicus, angulated at the boundary ; the whorls are 

 almost flat, and the last whorl is commonly angulate at the 

 periphery ; aperture diamond-shaped, though rounded on the inner 

 and outer margins. 



Type. — Niso eburnea, Risso. 



Niso psila, Tenison-Woods. 



1880. Mso psila, Tenison-Woods, Proc. Linn. Soc. N.S.W. vol. iv. p. 18, 



pi. i. %. 6. 

 1893. Niso psila, Tate and Dennant, Trans. Roy. Soc. South Aust. vol. xvii. 



pt. 1, p. 222. 



This species bears considerable analogy to iV. terehellata, 

 Lamarck, of the Eocene of Noi'th- Western Europe, but is more 

 rounded at the periphery of the whorl, and the apei'ture is 

 markedly angulate in front. It is regularly, distantly, spirally 

 striated, the striae being almost microscopic in size ; umbilicus 

 sharply keeled at the border. 



Dimensions. — Length 2r5 mm. ; breadth 8 mm.; length of 

 aperture 5'5 mm. 



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



G. 4227. An example of the adult, obtusely keeled at the 

 periphery of the last whorl. Presented hy John Dennant, Esq. 



G. 9478. Series illustrating stages of growth. Purchased. 



Eamily TURBINID.?!. 



Genus TURBO, Linnasus. 



[Syst. Nat. ed. 10, 1758, p. 761.] 



Shell imperforate, or narrowly umbilicate, solid ; spire short, 

 whorls rounded, nacreous in the interior ; aperture almost circular, 

 entire ; columella arched, broad ; outer margin simple, thin. 



Type. — Turlo marmoratus, Linnteus. 



