257 
Post-Eocent.—Table Cape (Tasmania). 
Mr. G. B. Pritchard, Proc. Roy. Soc. Vict., 1896, p. 143, has 
reduced this species to asynonym with UW. compta on the grounds 
that “there are so many gradations between them ;” this is not 
my experience. The main distinctive characters of M/. comptu 
are the straight hinge-line and the tendency to biplication at the 
front. 
. FAMILY THECIDIIDZ. 
Genus Tuecipium, Defrance, 1828. 
T. australe, Tate, 1, p. 166. 
EKocene.—Muppy Creek (Victoria). 
FAMILY RHYNCHONELLID. 
Genus RHYNCHONELLA, Fischer, 1809. 
hk. Baileyana, Tate, 1885, quoted from the Miocene locality, 
Jemmy’s Point, Gippsland Lakes, is not Australian. My surmise 
of its mesozoic origin is confirmed by Mr. R. Etheridge, jun., 
who attributes it to the Cretaceous of Faxoe. 
\ 
R. squamosa, Hutton ; id. Tate, 1, p. 166. 
Eocenrt.—River Murray Cliffs, Aldinga Bay, and Muloo- 
wurtie, near Ardrossan (South Australia); Muddy Creek, Maude 
(Hall and Pritchard), Waurn Ponds near Geelong (Victoria) ; 
also New ZEALAND. 
Post-Eocene.—Table Cap2 (Tasmania). 
Rhynehonella(?) tubulifera, spec. nov. PI. viii., figs. 4-4a. 
EKocene.—Mouppy Creek (Victoria). 
Shell lenticular, suborbicular or transversely quadrate-oval in 
marginal outline; cardinal margin arched, anterior and posterior 
margins rounded, front margin nearly straight. Pedunculate 
valve depressedly convex; beak bluntly and shortly pointed, 
straight, and declinous from the hinge; foramen broadly 
triangular, large, margined by two suberect narrow-lanceolate 
deltidial pieces. 
The ornament of the valves consists of rounded radial coste, 
increasing in numbers by repeated bifurcation, forty or more 
slightly serrating the margin; there they are a little wider than 
the subconcave furrows. The ribs are surmounted by stout 
truncated . tubular spines, sufficiently close together to be almost 
imbricating. Interior unknown. 
Dimensions.—Length, 7:5 ; height (incl. beak), 6°75; sectional 
diameter, 2°5 mm. 
One example obtained by Mr. J. Dennant from the polyzoal 
rock at Muddy Creek. 
Observations.—I had considered this unique fossil to belong to 
