92 EOCENE MOLLUSCA. 



B 



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, ^ an inch. 



Locality. Hordwell. French: Aurillac in the Cantal. 



No. 41. Limn^ea sub-quadrata. F. E. Edwards. Tab. XIII, fig. 1 a — b. 



L. testa ovato-oblonyd, turritd, Zcevij spird mediocri, apice acuto : anfractibus sex aut 

 septem plano-convexis : aperturd ovatd, antice dilatatd, spiram in lonyitudinem superanti ; 

 labio incrassato reflexo ; columella subrectd, plica parvd, via: 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 L. convexa, which it 

 most nearly resembles. 



Size. — Axis, rather more than \\ inch ; diameter, 8-10ths of an inch. 



Locality. — Headon Hill. 



No. 42. LiMNiEA convexa. F. E. Edwards. Tab. XIII, fig. 7 a — b. 



L. testa ovato-ventricosd, sexies circumvolutd ; anfractibus convexis, lavibus ; spird 

 elevatd, apice sub-acuto : aperturd ovatd, antice effusd, spiram in longitudinem superanti ; 

 labio reflexo ; plied columellari pro-eminenti, tortuosd, rotundald. 



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 L. 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 L. 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. 



