HELIX-LUCERNA. 99 



Umbilicate ; peristome continuous, parietal margin elevated, 



* pallescens. 



Narrowly or not umbilicate ; parietal margin adnate, 



Color light, spirally brown-banded, atavus. 



Dark, with zigzag silvery stripes, picturata. 



H. CARMELITA Ferussac. PI. 34, figs. 1-3. 



Imperforate, depressed, slightly dilated transversely, solid, opaque, 

 shining, chestnut-brown or nearly black, surface marked above the 

 periphery by oblique incremental striae composed of elongated 

 granules, beneath the periphery surface smooth, shining ; under a 

 lens there becomes visible an excessively minute sculpture of short 

 scratches, irregularly cross-hatching the surface between the granules ; 

 the granulation and microscopic sculpture sometimes subobsolete. 

 Spire low, rounded, obtuse; apex flat; suture linear, becoming 

 impressed at the latter half of the last whorl. Whorls 4, nearly 

 planulate, gradually widening, the last wider, angular at the per- 

 iphery, becoming rounded on its latter third, briefly deflexed anter- 

 iorly, not indented in the center beneath. Aperture oblique, ob- 

 long-truncate, silvery or bluish-white within ; peristome expanded all 

 around, white, baso-columellar margin reflexed and adherent to the 

 base, and expanded over the umbilicus in a wide white callus. 

 Margins of the peristome remote, joined by a translucent parietal 

 deposit. Alt. 21, diam. 44 mill. 



Jamaica. 



H. carmelita FEE. Prodr. 85 ; Hist. t. 32, f. 4. PFR. Symb. iii, p. 

 73 ; Monogr. i, p. 295 ; Conchyl. Cab. p. 362, t. 138, f. 4-6. REEVE, 

 f, 181. IT. mora GRAY Griff. Anim. Kingd. t. 36, f. 1. H. redfield- 

 iana C. B. AD. Contr. to Conch. No. 7, p. 107. 



Differs from the following species in the more depressed form, 

 more expanded umbilical callus, less expanded peristome and differ- 

 ent sculpture ; there is frequently an obtuse low tubercle on the col- 

 umella, close to the insertion. The basal lip is never toothed, as it 

 is in the following forms. 



H. BAINBRIDGEI Pfeiffer. PL 33, figs. 1, 2, 7, 8. 



Imperforate or with a narrow umbilical fissure, depressed, solid, 

 opaque, rather dull, brown, more or less tinged with purplish or 

 greenish, lighter around the axis below, and with a light peripheral 

 fascia ; surface evenly granulate above and below ; spire low-conoidal, 



