55 



Dimensions. — Length 30 mm.; breadth 10 mm.; length of 

 aperture 7 mm. ; length of anterior canal 17 mm. 



Form, and Loc. — Eocene : Hiver Murray cliffs, near Morgan. 

 G. 9334. Three specimens. Purchased. 



Genus DRILLIA, Gray. 

 [Ann. Nat. Hist. vol. i. 1838, p. 28.] 



This differs from Pleurotoma in having longitudinal ribs ; the 

 last whorl is, typically, short; and the columella is furnished 

 with a posterior callosity. The outer lip is thick, flexuous, and 

 a deeply-cut sinus is situated near the suture ; whilst the 

 columella is curved and frequently umbilicate. 



Type. — Drillia umbilicaia, Gray. 



Drillia trevori, Tenison "Woods. 



1879. Drillia trevori, Tenison -Woods, Proc. Linn. Soc. N.S.W. vol. iii. 



p. 227, pi. XX. fig. 4. 

 1889. Drillia trevori, Dennant, Trans. Eoy. Soc. South Aust. vol. xi. p. 44. 



Protoconch composed of two tumid, shining turns, the posterior 

 portion being laterally immersed. The longitudinal costae, which 

 become so well developed at later stages of growth, commence 

 in the brephic by prominent tubercles. Shell regularly and spirally 

 grooved ; suture hidden by an elevated prolongation of the posterior 

 part of the whorls, between which and the ribs referred to is 

 a rather broad and flat space. Aperture very small ; outer margin 

 greatly curved, sinus deep and near the suture ; columella covered 

 by a leaf-like expansion and having a tuberculose callus posteriorly ; 

 anterior canal short and somewhat twisted. 



This species is said to occur both in the Eocene and Miocene 

 beds of Muddy Creek. Mr. Tenison- Woods states (o/;. cit. p. 228) 

 that it considerably resembles D. beraudii of the south-east 

 coast of Tasmania. 



Dimensions. — Length 13 mm.; breadth 6 mm.; length of 

 aperture 5 mm. 



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



G. 4220. Three young and one adult specimens. 



Presented by John Dennant, Fsq. 



