168 Descriptions of Neiu Species and Varieties of Shells, 



in the upper whorls is less than in that shell, but its mean 

 divergence is greater. 



Mean divergence about 18° ; length .385 inch ; breadth 

 .095 inch ; length of aperture .11 inch. Inhabits near Swift 

 River head, Portland. 



AcHATiXA soLiTARiA. Shell clongatc, ovate conic : pale 

 brown ; with dark brown transverse lines, about three on each 

 whorl, wanting on the first two or three whorls : with excess- 

 ively minute crowded transverse striae : spire with the out- 

 lines a little convex : apex rather small : whorls eight, mod- 

 erately convex, slightly shouldered, with a rather deep suture ; 

 last whorl subplanulate, long : labrum thin, sharp, a little 

 produced in the middle : columella well produced and turning 

 a little to the left. 



Mean divergence about 20° ; length .52 inch ; breadth .15 

 inch ; length of aperture .185 inch. Inhabits New Hope, 

 Westmoreland. 



Spiraxis brevis. Shell long-ovate : pale horn color, trans- 

 lucent : shining, smooth anteriorly, otherwise with rather 

 numerous microscopic striee : spire with the outlines moder- 

 ately curvilinear : apex rather small : whorls six, moderately 

 convex, with a well impressed suture : aperture ovate : la- 

 brum thin and sharp : columella with the edge moderately 

 projected into the aperture. 



Mean divergence about 20° ; length .19 inch ; breadth .07 

 inch ; length of aperture .08 inch. 



The variety of Spiraxis aberrans, which was described on 

 page 88 as destitute of the transverse brown stripes, may be 

 designated by the name un[color. 



Bulimus mirabilis and B. anomalus may be referred to the 



BuLiMus HORTENSis. Shell much elongate, conic : horn 



