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UNIV Y 



HELIX-LUCEKNA. 1U 



Around the last whorl; whorls 4 to 5, scarcely convex, slowly 

 widening, the last convex, depressed-orbicular, bluntly keeled at 

 the periphery, deeply deflexed anteriorly, tri-scrobiculate behind 

 the peristome, the grooves nearly equidistant, inner one very short ; 

 aperture subhorizontal, transverse-oval; peristome brown or flesh- 

 colored, broadly expanded, basal margin reflexed, adnate over the 

 umbilicus, bearing within four acute teeth, the inner two near to- 

 gether, outer two not united, lamellar, acute. 

 Alt. 16-18, diam. 33 mill. 



Jamaica. 



H. atavus Shutt. in Mus. Cuming, PFEIFFER, Monographia, iv, p. 

 243 ; v, p. 316. 



PfeifFer is in error in referring Reeve's figure of H. fortis to this 

 species. H. atavus may be known by the large size, dark spire and 

 pale base, three outer teeth nearly equidistant, the outer two not 

 situated upon nor connected by an elevation. 



H SLOANEANA Shuttleworth. PI. 38, figs. 67-70. 



Imperforate, depressed-trochoidal, solid, opaque, shining, brown 

 (often livid-brown, or olive-tinged brown) with a lighter peripheral 

 fascia, and fading out in the center of the base ; surface densely 

 granulate, the granulation appearing often partly effaced ; spire 

 dome-shaped ; low or rather elevated, obtuse ; apex planulate ; 

 sutures scarcely impressed ; whorls 5, slightly convex, the last ob- 

 tusely keeled in the middle, descending at the aperture, deeply 

 scrobiculate behind the peristome, the inner groove nearly concealed 

 by the reflection of the lip, the outer two near together, occupying 

 a single deep depression (not separated as in H. atavus) ; the 

 grooves are subparallel ; aperture subhorizontal transverse ; peristome 

 brown, broadly expanded, basal margin reflexed, adnate over the 

 umbilicus, bearing four teeth within, the outer two connected at 

 their bases, the inner tooth small, sometimes obsolete. Margins of 

 peristome joined by a callous continued across the parietal wall from 

 the upper termination of peristome 



Alt. 13-14, diam. 28-29 ; alt. 16, diam. 27 mill. 



Jamaica. 



H. sloaneana Shutt. in ALBERS, Die Heliseen (2d ed., 1861), p. 

 153. PFR., Monogr. v, p. 316. H. bronni var /5. PFR. Monogr. iv, 

 p. 243. H. schroeteriana, REEVE, Conch. Icon. f. 236. 



The points of difference noted in the above 'description will sepa- 

 rate this form from H. atavus. The species is less globose than H. 



