28 



BuLiMus TEREBELLA. Shell very much elongated, regularly ta- 

 pering to the summit ; dingy white ; with numerous transverse light- 

 ly impressed striie ; spire with rectilinear outlines ; apex rather ob- 

 tuse ; whorls nine and one-half, short, quite convex, with a deep su- 

 ture ; aperture subovate, moderately acute above ; labrum thin and 

 sharp. 



Mean divergence 12° ; length .3 inch ; breadth .07 inch ; length 

 of aperture .052 inch. 



BuLiMUS AXOMALUS. Shell with the general form and sculpture 

 of Truncatella, cylindi-ical ; whitish ; with very numerous strong trans- 

 verse ribs, which are continued quite into the suture ; spire with rec- 

 tilinear outlines ; apex ? ( the apex in the only specimen before 



me is broadly truncate, ) six whorls remaining, which are moderately 

 convex, somewhat shouldered, with a well impressed suture ; last 

 whorl rather long, with a slight constriction around the middle, which, 

 also modifies the aperture, which is rather long, slightly acute above, 

 well rounded below ; labrum thin and sharp : columella stout, very 

 prominent, arcuated or twisted in a loose spiral to an extraordinary 

 degree. 



Mean divergence 12°; length .23 inch; breadth .075 inch; length 

 of aperture .07 inch. 



BuLiMUS MINIMUS. Shell very much elongated, cylindrical ; trans- 

 Iticent, white; elegantly sculptured with very numerous flat slightly 

 prominent arcuate ribs, about twenty -five on each whorl, and nu- 

 merous microscopic spiral strice ; spire with rectilinear outlines ; apex 

 very obtuse ; whorls seven, long, very convex, with a very deep su- 

 ture ; last whorl very long and narrow ; aperture short, moderately 

 acute above, well rounded below ; labrum sharp ; columella not per- 

 ceptibly thickened. 



Mean divergence S'^ or 9°; length .1 inch; breadth .02G inch; 

 length of aperture 024 inch. 



BuLiMUs MONODON. Shell ovate-conic ; dingy white; with some 

 slight striae of growth ; spire with the outlines somewhat convex ; ap«?x 

 subacute ; whorls nearly five and one-half, a little convex and shoul- 

 dered, with a well impressed suture ; last whorl large and wide, some- 

 times a little constricted near the aperture, which is rather wide, ovate, 

 moderately acute above ; labrum thin and sharp ; columella straight, 

 with an oblique tooth near its extremity ; umbilicus very small. 



Mean divergence 45*^; length -25 inch ; breadth .15 inch; length 

 of aperture .13 inch. 



