56 



Drillia oblongula, sp. nov. 



[Plate III. Figs. 7fl-i.] 



Shell small, turreted, fusiform ; protoconch witli two smooth 

 subangulate turns, closely resembling that of D. trevori. Whorls 

 six in number, longitudinally obliquely costated in the brephic 

 and neanic stages, closely spirally lineate, the lineations being 

 irregularly granular at the points of intersection of the growth- 

 lines; typically the costated whorls are deeply sulcated spirally, 

 and in later stages of growth a lineation is developed in each 

 sulcus. On arrival at the adult stage this lineation becomes 

 more conspicuous, but never attains to the same proportions as 

 the originally-formed lineations. These latter persist over the 

 whole body-whorl down to the tip of the anterior canal. Suture 

 marginate and accompanied, anteriorly, by a broad band, medially 

 sulcated, denoting the former positions of the sinus. Aperture 

 narrow, but inflated towards the middle ; outer margin arcuate, 

 the deep, broad sinus being situated near the suture ; inner margin 

 covered by a thin coating of enamel ; columella slightly twisted ; 

 anterior canal very short. 



This differs from D. integra, Tenison- Woods, in not being con- 

 spicuously ribbed, and by the absence of costae in the adult, though 

 the shell is somewhat corrugated longitudinally at that stage. It 

 differs also in not being broadly sulcate above, nor regularly spirally 

 lirate ; whilst the outer margin is not thickened to an appreciable 

 extent. A form from the same locality has smoother whorls. 



Dimensions. — Length 13'5 mm. ; breadth 5 mm.; length of 

 aperture 6 mm. 



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



G. 4219. Adult and young examples. 



Presented hy John Bennajit, Esq. 



Drillia vixumbilicata, sp. nov. 



[Plate III. Figs. 8a-4.] 



Protoconch composed of two smooth elongnted turns, the anterior 

 of which is faintly spirally striated. Shell lanceolate, having seven 

 subangulate convex whorls ; the earlier of these are distinctly 



