497 



D. with a fub-cylindric, arcuated flieil, marked with Trachea. 

 i-egular, ftrong, tranfverfe ftriee, or annulations : aper- Tab. ]4. f. 10. 

 ture round, from whence it tapers a little to the other 

 extremity, which is clofed, truncated, and furnifhed 

 with a fmall, round protuberance: colour ferruginous- 

 brown, lighted towards the fmaller end. Length rather 

 more than one eighth of an inch; diameter one fifth of 

 its length. 



This fpecles is at once diftinguiflied from the laft, by- 

 being more arcuated, and a little tapering; is longer in 

 proportion to its breadth, the margin of the aperture 

 even, and not contrafled, and the annulations flronp-er, 

 giving it the appearance of the windpipe or trachea of 

 an animal. 



We found It in fand from Milton in DevovJIiire, but 

 is extremely rare. 



^ 6. 



D. with a cylindric, arcuated, fmooth, glofTv, white Glakrum, 

 fhell, devoid of either flriae or wrinkles, and equal in 

 fize throughout: aperture orbicular; the other end 

 clofed, rounded, and fub-marginated. Length fcarce • 

 one line ; diameter one fifth of its length. 



This nondefcript fpecies is found amongfl: the flmd at 

 Biddeford bay, but more plentiful near Barnjlable, on 

 the north coafl: of DevonfJiire, amongft the rejeBamenta. 

 of the river, occafioned by the influx of the tide. 



S's s GEX. 



