261 
CLASS SCAPHOPODA. 
BIBLIOGRAPHICAL REFERENCES. 
1. Tate, ‘‘ Scaphopods of the Older Tertiary of Australia,” in Trans. Roy. 
Soc., S. Aust., vol IX, 1887. 
2. Harris, ‘‘ Tertiary Mollusca of Australasia,” British Museum Publica- 
tion, 1897. 
3. Sharp and Pilsbry, in ‘‘ Tryon’s Manual Conchology,” vol. XVII., 1898. 
FAMILY DENTALIIDA. 
The characters, viz., the presence or absence of an apical slit 
or notch or of an apical plug, which have been utilised for the 
genera of the family, have lately been shown to be more or less 
adventitious, and, therefore, they can be employed only for mere 
classificatory convenience ; hence Hntalis, as previously employed 
by me in a generic sense, merges into Dentalium. However, I 
adopt Pilsbry’s arrangement of the groups, though I degrade his 
subgenera to sections, as a convenient method of contrasting our 
species. 
Genus Dentatium, Linneus. 
SECTION DENTALIUM (sensu stricto). 
Shell longitudinally ribbed at least posteriorly, apex without 
slit or notch. 
This group is unrepresented in the Older Tertiaries, unless 
D. bifrons should eventually prove to be without an apical slit or 
fissure. 
SECTION FissIDENTALIUM, Fischer, 1885. 
Shell longitudinally ribbed at least near the apex, a long apical 
slit. 
D. bifrons, Tate, 1, p. 192; id., Harris, 2, p. 295. 
Post-EocenE.—Spring Creek (Victoria). 
MiocEeNnE.—Muppy Creek (Victoria). 
The apex is still unknown, and therefore the location of the 
species in this section or in the foregoing is uncertain. 
D. Mantelli, Zittel, 1864 ; id., Tate, 1, p. 190; id., Harris, 2, p. 293. 
Eocene.—River Murray Cliffs and Aldinga Bay (8. Aust.) ; 
Bellarine Pen. (Hall and P.), Muddy Creek, Gelibrand River, 
Mornington, Corio Bay, Birregurra, Moorabool Valley, Camper- 
down, Shelford, Cape Otway (Victoria) ; also NEw ZEALAND. 
Post-EocenE.—Table Cape (Tasmania), and Spring Creek 
( Victoria.) 
_ I am now able to pronounce on the specific distinction of 
D. Mantella and D. Kickui, Nyst (authentic examples of the 
latter from the Miocene at Boom, Belgium, I have under 
observation). Tasmanian examples of D. Mantelli were referred 
by Tenison-Woods to the Belgian species. I do not know to 
what group D. Kickass belongs, but apart from any apical differ- 
