83 



whorls : whorls remaining ten, subplanulate, with a vrcll imprcpsncl 

 suture: aperture considerably proclueed beyond the penult whorl, be- 

 tween orbicular and trapezoidal, slightly eiFuse by the canal within 

 the anterior keel ; lip well expanded, moderately reflected. 



Length .82 inch; breadth .18 inch. 



Cylindrella AuGUSTyE. Shell not very slender, cylindrical in 

 the lower three-fourths, slightly tapering above : pale wax color : 

 with very minute crowded transverse stria ; anterior spiral keel not 



very prominent : apex broadly truncate, with the loss of whorls ; 



whorls remaining nine, a little convex, with a well impressed suture : 

 aperture moderately produced beyond the penult whorl, suborbicular, 

 a little dilated at the left of the upper side : lip well expanded, mod- 

 erately reflected. This species is allied to the preceding and to C. 

 montana. 



Length .65 inch ; breadth .17 inch. 



AcHATiNA Blandiana. Shell regularly conic, but very slender : 

 very pale brown or horn color, with very dark brown transverse 

 broad bent stripes, about thi'ee on each whorl, less distinct on the up- 

 per whorls, and wanting on the nuclear whorls : with rather fine reg- 

 ular transverse striae ; rather thickly and very finely crenulated at 

 the upper margin of the whorls : apex moderately obtuse, smooth on 

 the first whorl : spire very long, with the outlines rectilinear : whorls 

 nine, moderately convex, slightly and acutely shouldered above, with 

 a well impressed suture : aperture rather long-ovate, small : labrum 

 sharp, very thin : columella nearly straight. This species is most 

 nearly allied to A- propinqiia. 



Mean divergence about 1G°; length .62 inch ; breadth .135 inch; 

 length of aperture .16 inch. 



AcHATiNA PUELLA. Shell ovato fusiform, much elongated : sub- 

 transparent, pale brownish yellow, with brown transverse stripes, 

 which rre very narrow except at their summits, where they are much 

 dilated and are very deeply colored ; there are on each whorl four or 

 five of these stripes except near the apex : varicose coincidently with 

 the brown stripes ; with rather fine regular transverse striae : apex 

 rather obtuse, with rather more than one whorl smooth : spire rather 

 long, with the outlines a little curvilinear : whorls eight, moderately 

 convex, with a well impressed suture : aperture rather long ovate, 

 narrow and very acute above : labrum sharp and thin : columella 

 nearly straight, but little truncated. 



