100 HELIX-LUCERNA. 



apex obtuse, plane ; sutures linear. Whorls 5, plane, slowly widen- 

 ing, the last not descending, bluntly subangular in front of the aper- 

 ture. Aperture very oblique, livid-brown inside, showing the light 

 band ; peristome broadly expanded and recurved in every part, 

 polished, brown ; basal margin bearing a small compressed pliciform 

 denticle at the point of its junction with the outer lip, and often a 

 small tubercle nearer the columella; columellar margin short, arcu- 

 ate, broadly expanded and adnate over or nearly over the umbilical 

 tract. Margins of peristome joined by a polished brown callus. 

 Alt. 28-33, diam. 54-61 mill. 



Jamaica. 



H. bainbridgei PFR. P. Z. S. 1845. p. 44 ; Conchyl. Cab. p. 357, t. 



63, f. 5, 6 ; Monogr. i, p. 313. REEVE, f. 222. H. lamarckii var. 

 unidentata FER. Hist., t. 58, f. 1, 2. ? H. pretiosa AD. Contr. to 



Conch, no. 9, p. 171 ; no. 10, p. 204. PFR. Monogr. iv,p. 240. IT. 

 spengleriana PFR. P. Z. S. 1846, p. Ill ; Monogr. i, p. 292 ; Conchy L 



Cab. p. 311, t. 128, f. 1, 2. 



Differs from H. carmelita in being more finely granular, and 

 equally so above and beneath. There is no mistake about the 

 identity of the forms included in the above synonymy. In the large 

 series before me transition forms are more numerous than typical 

 examples of the several varieties. 



Var. PRETIOSA C. B. Ad. PI. 33, figs. 6, 7, 8. 



Typically this form has a higher spire than H. bainbridgei, and 

 the substance of the shell is white ; the thin cuticle is yellowish ; 

 peristome white. Alt. 35, diam. 55 mill. 



Var. SPENGLERIANA Pfr. PI. 34, fig. 4 ; pi. 30, fig. 53. 



Similar in form to typical H. bainbridgei ; upper whorls very 

 minutely granulated ; body-whorl striate, smooth, not granulated. 

 Differs from bainbridgei in the lack of granulation on the last 

 whorl. 



H. SUBACUTA Pfeiffer. PI. 25, figs. 56, 57. 



Imperforate, depressed-convex, carinate, solid, opaque, shining be- 

 low, duller above, brown ; surface above somewhat granulated upon 

 the oblique incremental striae, nearly or quite smooth beneath ; spire 

 low, obtuse ; apex planulate, suture linear ; whorls 5, a trifle con- 

 vex, slowly widening, the last carinate, depressed ; aperture wide- 

 lunar, transverse, very oblique, livid within ; peristome white, upper 



