263 
close, subequal riblets extending longitudinally from apex for 
about three-fourths of total length of shell. The riblets become 
faint at about haif the total length, where appears fine annular 
sculpture ; the anterior one-fourth with fine annular sculpture. 
Aperture circular with an acute peristome. Apex with a straight, 
short, narrow slit on the convex side; apical orifice contracted 
by a plug deeply and widely cleft from the convex to the concave 
side, 
Length of shell, 11 to 13; diameter of aperture, 1 ; height of 
arch from chord, 1:25 mm. 
Miocene.—Muppy Creek (Victoria). 
In Pilsbry’s arrangement of the recent Dentaliums, this fossil 
species falls in the “Group of D. sectum” of the Section 
Graptacme. Jn slenderness and curvature it approximates to 
the two species including in the group, nearer to calamus than to 
sectum by the longitudinal striz extending nearly to the aperture; 
from both it is distinguished by the prominent annular sculpture 
of the anterior portion of the tube. 
SEcTION L2VIDENTALIUM, Cossmann, 1888. 
Shell smooth with annular growth lines. 
a. Apex with a short slit or triangular notch. 
D. subfissura, Tate, 1, p. 191; zd., Harris, 2, p. 296. 
Apical fissure a short triangular notch with a plug in the type 
example. 
EocENE.—RiveR Murray Cuirrs and Aldinga Bay (S. Aust.) ; 
Bellarine Pen. (Hall and P.), Muddy Creek, Gelibrand River, 
Mornington, Corio Bay, Belmont, Camperdown, Shelford, Maude, 
Cape Otway (Victoria). 
Post-EocENE.—Spring Creek (Victoria). 
Dentalium pictile, spec. nov. PI. viii., fig. 8. 
Shell slender, about thirteen times as long as wide, much. 
arched, smooth, without any trace of strie, dark coloured with 
lighter-coloured oblique bands. Apex about one millimetre in 
the lateral diameter, slightly less in the concavo-convex diameter, 
with a short and broad notch on the convex side ; there are 
traces of a plug. 
Length, 52; breadth of oral aperture, 4; height of arch from 
chord, 6 mills, 
Post-Eocenr.—TaBLeE (CAPE Tasmania). 
Previously listed by Tate and Dennant, Correlation Papers, 
III., 1896, as D. subfissura. I separate this species from 
D. subfissuwra, because of its greater curvature, not so slender at 
the apex, which is elliptic, and not circular in sectional outline. 
