148 LEtJCOZONIA. 



on the inner border by a conspicuous denticle ; columella excavated 

 and carrying an acute fold anteriorly, with traces of accompanying 

 granulations in the gerontic stage ; canal moderately long and 

 slightly bent. 



Compared with L. murrayanus, it is much smaller, though of the 

 same general build ; it is relatively more elongate, whilst the 

 obtuse costae, plain body-whorl, thickened outer margin, and 

 the fewer number of plications on the columella in the present 

 species are very characteristic, readily serving to distinguish it 

 from all the other species of Latirus. 



Dimensions. — Length 12'5 mm. ; breadth 6 mm. ; length of 

 aperture 4 mm.; length of canal 2-75 mm. 



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



G. 9860. A series exhibiting stages of growth. Purcliased. 



Genus LETJCOZONIA, Gray. 



[Proc. Zool. Soc. 1847, p. 136.] 



This genus, closely allied to Latirus, is more globose, has 

 a short, keeled spire, a very short anterior canal, excavated 

 columella with three or four obliqiie plications, the outer margin 

 being jjlicated internally and especially characterized in typical 

 examples by a prominent and often very long denticle on the 

 forepart, opposite the columellar plications. 



Type. — Murex nassa, Gmelin. 



Leucozonia nassa, Gmelin (sp.). 



[Plate V. Figs. lla-J.] 



1790. 3Lirex nassa, Gmelin, Linn. Syst. Nat. torn. i. pars 6, Vermes, 



p. 3,5-51, No. 93. 

 1822. Ttirbinella cinguUfera, Lamarck, Hist. Nat. Anim. sans Vert. t. vii. 



p. 107. 

 1881. Leucozonia cinguUfera, Tryon, Manual of Conchology, vol. iii. p. 94. 



Shell fusiform, solid ; whorls angulate at the periphery, where 

 broad, undulating, longitudinal costae are compressed, producing 

 serration in typical examples; body-whorl carrying one or more 



