150 



color, subtransparent : with five spiral carinse, one of which is 

 visible on the spire ; with very delicate spiral raised lines, 

 usually three to six in each interspace : spire moderately ele- 

 vated convex : whorls three and one-half, moderately convex, 

 subangular ; with a well impressed suture ; last whorl scarce- 

 ly detached from the penult whorl at the aperture : aperture 

 rather large, slightly constricted behind the lip, which is mod- 

 erately produced, above not very abruptly produced, scarcely 

 modified by the carinse ; labium well detached from the pe- 

 nult whorl, scarcely reflected : umbilicus rather wide, with 

 the spiral lamella moderately developed. Operculum deeply 

 concave, subauriculate, smooth. 



Mean divergence about 145" ; height .035 inch ; greatest 

 breadth .065 inch ; least breadth .055 inch. 



This species much resembles the preceding. It is most 

 readily distinguished by its inferior size, and by the greater 

 number of fine spiral striae. 



Stoastoma Moricandunum. Shell globose conic ; horn 

 color, or very pale yellowish green : with numerous very fine 

 somewhat tortuous raised spiral lines, of which three or four 

 are visible on the spire ; and two or three stiU more minute 

 lines in each interspace ; but in some, all the lines are nearly 

 equal : spire well elevated, with the outlines nearly rectilinear : 

 whorls" four, quite convex, with a well impressed suture ; last 

 whorl subglobose : aperture rather larger than a semicircle, a 

 little campanulate : labrum moderately and above not abrupt- 

 ly produced, scarcely modified by the larger spiral lines : labi- 

 um moderately detached from the penult whorl, slightly curved 

 and reflected : miibilicus narrow, with the spiral lamella very 

 small. Operculum rather deeply concave, subauriculate, very 

 finely papillose. 



Mean divergence about 85°|; height .075 inch ; greatest 

 breadth .085 inch ; least breadth .075 inch. 



