92 EOCENE MOLLUSCA. 
greater flatness of the sides of the spire and the less prominent and less oblique fold 
of that species. It appears to be very scarce. 
Size.-—Axis, rather more than 1 inch; diameter, 3 an inch. 
Locality. 'ordwell. French: Aurillac in the Cantal. 
No. 41. Limnma suB-quADRATA. F. L. Edwards. Tab. XII, fig. 1 a—4. 
L. testdé ovato-oblongd, turritd, levi; spird mediocrt, apice acuto: anfractibus sex aut 
septem plano-convevis: apertura ovatd, anticé dilatatd, spiram in longitudinem superanti ; 
labio incrassato reflexo ; columella subrectd, plicd parvd, viv eminenti, sub-acutd. 
Shell ovate, oblong, turreted, smooth, with six or seven rather flatly-convex volu- 
tions; spire moderately elevated, with an acute apex; aperture ovate, somewhat 
effuse in front, and rather more than half the length of the whole shell; the inner lip 
thickened, and a little reflected; the columella nearly straight, and presenting a small, 
rather sharp fold, which scarcely projects into the aperture. 
The turreted and depressedly convex form of the whorls gives a sub-quadrate 
appearance to this shell, by which, as well as by its nearly straight columella, and 
sharp and barely prominent fold, it may be distinguished from Z. conveva, which it 
most nearly resembles. 
Size.-—Axis, rather more than 14 inch; diameter, 8-10ths of an inch. 
Locality—Headon Hill. 
No. 42. Limnwa convexa. Ff. £. Edwards. Tab. XII, fig. 7 a—4é. 
L. testé ovato-ventricosd, sexies circumvolutd ; anfractibus convexis, levibus ; spira 
elevatd, apice sub-acuto: aperturd ovatd, anticé effusd, spiram in longitudinem superanti ; 
labio reflexo ; plica columellari pro-eminenti, tortuosd, rotundata. 
An ovate ventricose shell, formed of six smooth convex volutions, with a mode- 
rately elevated and pointed spire: aperture ovate, effuse in front, and rather longer 
than the spire; the inner lip slightly reflected; the columellar fold round, prominent, 
and very oblique. 
This species somewhat resembles LZ. sub-quadrata ; the whorls, however, are more 
regularly convex, and do not present the turreted appearance which characterises that 
shell; and the round columellar fold is much more prominent, and more strongly 
twisted. In the convexity of the whorls it approaches Z. pyramidalis, but the flat 
sulcated fold separates that species from this. 
Size.—Axis, 1 inch and 3-10ths; diameter, 6-10ths of an inch. 
Locality——Headon Hill. In Mr. D’Urban’s collection. 
