116 HELIX-LUCERNA. 



so, nearly parallel with the adjacent two teeth. The four teeth are 

 almost equally spaced. 



Umbilicate, depressed, obtusely carinated, minutely granulated 

 all over, dark-brown, often with a light peripheral fascia ; whorls 

 about 5, the apical two convex, shining, the others flatter than in 

 H. sinuata, scarcely convex, slowly widening, the last more de- 

 pressed than that of H. sinuata, deeply tri-scrobiculate behind the 

 peristome, deeply deflexed anteriorly ; aperture subhorizontal, ob- 

 long wedge-shaped ; peristome broadly expanded, basal margin re- 

 flexed, partly concealing the deep broad umbilicus, quadri-dentate 

 within, the teeth equally spaced, lamellar, entering, nearly closing 

 the aperture, the outer largest, inner smallest, outer tooth a trifle 

 turned outward at its inner termination, not nearly so decidedly so 

 as in H. sinuata. Terminations of peristome united by a more or 

 less elevated parietal callous. Alt. 13, diam. 28-30 mill. 



Jamaica. 



H. sinuosa FER. Hist. t. 54, f. 3. PFR. Monogr. iii, p. 259; iv, 

 p. 309 ; v, p. 413 ; Conchyl. Cab. p. 279, t. 122, f. 14, 15. IT. con- 

 sanguinea C. B. AD. Contrib. to Conch, no. 9, p. 170. H. simson 

 PFR. Zeitschr. f. Mai. 1852, p. 92 ; Monogr. iii, p. 211 ; Conchyl. 

 Cab.t. 153, f. 8,9. 



This species forms a transition stage between H. sinuata and 

 H. anomala. It is rarely imperforate. I have before me a variety 

 of H. sinuata which resembles sinuosa in having a broad umbilicus, 

 but it has the outer tooth of basal lip bent outward at its inward 

 extremity as in typical sinuata. The best differential characters 

 for separating the two forms are found in the equally-spaced teeth 

 of H. sinuosa, all four of them nearly parallel. 



A small variety is imperforate, and measures, alt. 12 2, diam. 23 

 mill. 



VARIETY. PI. 38, figs. 74-77 represent a form which has a well- 

 developed accessory tooth between the first and second teeth of the 

 base. It is otherwise like the type, 



Var. SIMSON Pfr. PI. 38, figs. Vl-73. 



Similar in all respects to H. sinuosa except that it is more elevated, 

 body-whorl less depressed, outer two teeth united at their bases. 



Alt. 16, diam. 28 mill; alt. 15, diam. 25 mill. 



The elevated form of typical shells of this variety reminds one of 

 H. valida Ad. 



