PULMONATA. 143 



ceeding half an inch in length ; while others, in a state of maturity, barely attain half 

 that size. The figured specimen is nearly 4-10ths of an inch long, by \ of an inch wide. 

 Localities. — Bracklesham, where it is very rare. French .- Grignon, Parnes, 

 Mouchy, Courtagnon, Creil, Vexin, Acy (fide D'Orb.). Italian: Castel-Gomberto, 

 near Vicenza (fide Bronn), Magdeburgh (fide Phil.), Westeregeln ? (fide Beyr.), 

 Gainfahren ? (fide Homes). 



No. 84. Marginella pusilla. F. E. Edwards. Tab. XVIII, figs. 6 a — c. 



M. testa minima, ovali ; spird exsertiusculd, apice obtuso : aperturd elongatd, mediocri, 

 anticeprofunde emarginatd; labro extus marginato, intus crenulato ; columella sub-recta, 

 quinquies vel sexies plicatd, plicis fere transversis, sub-cequalibus. 



Shell minute, oval ; spire slightly elevated, with an obtuse apex : aperture elongated, 

 moderately wide and deeply notched in front ; outer lip thickened along the outer 

 margin, and finely crenulated within; columella nearly straight, with five or six folds, of 

 which the anterior two are the longer and slightly oblique, and the others are 

 almost transverse and nearly equal in size. 



This pretty little Marginella appears to be perfectly distinct from all its congeners. 

 It occurs rather plentifully in the Highcliff sands ; but apparently disappears in the 

 Barton sands and clay, as I have not met with any specimen from those deposits. It 

 reappears in the fluvio-marine formation in Headon Hill, in which it is found sparingly. 



Size. — Axis, not quite 2-10ths of an inch; diameter, l-10th of an inch. 



No. 85. Marginella simplex. F. E. Edwards. Tab. XVIII, figs. 8 a — c. 



M. testa ovato-oblongd ; spird brevissimd, pcene obtectd ; aperturd elongatd, postice 

 angustd, antice latiori, ad basin late emarginatd ; labro extus incrassato, intus mutico ; 

 columella quinquies vel pluries plicatd. 



Shell small, ovate-oblong ; spire short, depressed, almost concealed ; aperture 

 elongated, narrow behind, effuse, and widely but not deeply notched in front ; outer 

 lip thickened along the margin, smooth, uncrenulated within ; columella with two 

 distant slightly oblique folds in front, and three or more obscure, nearly transverse, 

 folds behind. 



This species so closelyresembleslf.oyw/afa in its general aspect, that a hasty comparison 

 would lead to the two being regarded as identical: there are, however, several differ- 

 ences which entitle the present shell to specific distinction. The spire is shorter and 

 more depressed, and the anterior folds on the columella are more distant, and not so 

 oblique ; but that which particularly distinguishes M. simplex is the condition of the 



