CENSUS OF THE OLDER TERTIARY FAUNA OF AUSTRALIA. 401 
therefrom ; whilst some species of Fossarus offer such similitudes, 
¢.9., F. lamellosus, Montrouzier, recent, New Caledonia with which 
our fossil presents much analogy. 
Family Lacunip2. 
Genus Streblorhamphus, Tate and Cossmann, 1898, 
Etymology: Streblos, twisted ; rhamphos, a er in allusion 
to the twist of the columella. 
Type: 8. mirulus, Tate and Cossmann (spec. nov.) ; Eocene, 
Muddy Creek, Victoria. (Plate 20, fig. 4.) 
Shell very small, short, turbinated, subulate ; embryo obtuse ; 
whorls five, hardly convex, separated by an indistinct suture ; 
surface smooth and shining. Body whorl equalling three-fourths 
of the total length, oval at the base which is perforated by a 
narrow umbilical chink, circumscribed by a prominent rim. 
Aperture oval, angular behind, terminating in front by a short 
harrow snout upon which the umbilical rim is decurrent ; peris- 
tome continuous ; labrum arched and deeply insinuated at the 
front ; columella very arched abruptly and feebly twisted at the 
front, the twist forms the margin to the anterior beak of the 
aperture ; columella-border narrow and callous, making an angle 
at its extremity with the border of the beak. 
Streblorhamphus differs from the typical Lacune by the anterior 
torsion of the columella, which is not a tooth placed low down as 
in Lacunophycis; it has the beak and insinuated basal lip of 
Entomope and the bourrelet of the — Lacuna. The embryo 
is that of the Lacunide. 
STREBLORHAMPHUS oBESUS, spec. nov., Tate. (Plate 19, fig. 8.) 
Differs from §. mirulus by more convex whorls, body-whorl more 
inflated and relatively very much larger, and is altogether a broader 
Squat shell. Length of four and a-half whorls 3, breadth 2 mm. 
Eocene, Mornington, Victoria. 
Z—Dee, 1, 1897. 
