Tertiary. ] PALZONTOLOGY OF VICTORIA. [ Mollusca, 
Prate XLIX,, Fia. 1. 
CYPRAA (LUPONIA) LEPTORHYNCHA (McCoy). 
[Genus CYPREA (Liny.). (Sub-kingd. Mollusca. Class Gasteropoda. Order Pectini- 
branchiata. Fam. Cypreidez.) - 
Gen. Char.—Shell ovato-oblong ; spire very short, or entirely covered by the body-whorl ; 
back rounded ; inner and outer lips inrolled ; aperture narrow, as long as the shell, reflected at 
both ends, transversely toothed and ridged on each side. 
Sub-genus.—Aricia (Gray). Surface highly polished ; gibbous above ; flattened, thickened, 
and dilated at the sides below ; spire covered ; aperture straight, narrow ; outer and inner lips 
callous, thickened, wide, dentated. 
Sub-genus.—Luponia (Gray). Ovato-pyriform, ventricose, smooth, polished ; spire usually 
covered, depressed; aperture narrow, straight,; inner margin plicato-crenulated ; outer lip 
denticulated. ] 
Description.—Pyriform, back ventricose and abruptly rounded towards the 
posterior side, which has a shallow depressed umbilicus, partially exposing three or 
four turns of the spire (the apex of which is the most depressed), tape1ing more 
gradually anteriorly to a straight slender beak or canal, subtruncate in front, 
margined on each side by a narrow thickened extension of the inner and outer lips, 
separated by a definite hollow from the back; an obliquely longitudinal depression 
occupies the middle of the back of the anterior canal, extending from a little to the 
right at base to a little on the left of the middle in front, it is bordered by two small 
oblique, prominent, obtuse ridges; no posterior canal, the outer lip only projecting 
backwards in a short lobe with a thickened quadrate margin. Base only slightly 
thickened at the anterior and posterior ends, thin and simply convex in the middle ; 
outer lip inflected with about 42 strong, sub-equal, tooth-like ridges, narrower 
than the spaces between them, slightly sinuous so as to widen the aperture at base 
of anterior canal, the posterior third of its length abruptly inarched towards the left 
side in nearly quarter of a circle extending slightly beyond the line of the apex of 
the spire ; inner lip convexly rounded with short slender ridges, irregular in size, 
shape, and direction. Surface smooth and glossy. Length of average specimen, 
2inches 5 lines; proportional width, 563, ; height, 335,; diameter of umbilicus or 
exposed spire, 72,; length of anterior canal, +,2,; backward extension of outer 
lip, 100° 
This species slightly reminds one of the European Eocene C. 
inflata and C. globularis, but the greatly inarched toothed posterior 
end of the outer lip easily distinguishes it, as well as the different 
form of the anterior beak ; it is also slightly allied to the C. Havert 
and C. Genei of Michelotti in his work on the Miocene fossils of 
N. Italy, but is easily distinguished by the same characters. 
In the slight indication of two tubercles separated by a marked 
depression at base of back of anterior canal, as well as in its definite 
thickened lateral margins, and shallow umbilicus exposing the 
spire, it slightly resembles the C. eximia, but is easily distinguished 
[ 35 ] 
