108 HELIX-LUCERNA. 



H.soror FER., Prodr. 118; Hist. t. 54, f. 43. PFR. Symbols, iii, 

 p. 80 ; Monogr. i., p. 401 ; Conchyl. Cab. t. 78, f. 3, 4. REEVE, f. 

 238. Carocolla quadridentata MKE., Cat. Malsb., p. 5 (teste Pfr.). 



H. soror is more acutely carinated than H. schroeteriana, and the 

 entire central part of the base is dark chestnut colored ; whilst 

 H. schroeteriana has only a dark band encircling the base, the 

 circum-umbilical tract light. I have seen a few specimens of the 

 last-named species in which the central part of the base is dark> 

 and such shells can only be distinguished from H. soror by the 

 more convex base and less acute periphery. None of the numerous 

 specimens of H. soror before me have the umbilicus wholly covered. 



H. SCHRCETERIANA Pfeiffer. PL 36, figs. 31-36. 



Unibilicate or imperforate, depressed, solid, opaque, somewhat 

 shining, white, with two dark bands more or less marked zig-zagly 

 with whitish flecks, one on the upper, one on the lower surface; 

 obsoletely obliquely striate ; obsoletely granulate ; spire conoidal, 

 low; apex obtuse; sutures linear; whorls 4? to 5, flat, the last 

 acutely carinated, somewhat deflexed anteriorly, with three deep 

 grooves or scrobiculations behind the peristome ; aperture very 

 oblique, transverse ; peristome brown or white, expanded, reflexed, 

 somewhat thickened, and convex, lower margin with four teeth 

 within, the inner small, often obsolete, the two outer joined at their 

 bases; terminations of the peristome joined by a shining callus. 



Alt. 14, diam. 30 mill. 



Jamaica. 



H.- schroeteriana PFR., P. Z. S. 1845, p. 44; Conchyl. Cab., p. 66, 

 t. 78, f. 5, 6 ; Monographia i, p. 403. PHILIPPI, Abbild. u. 

 Beschreib. ii, p. 185, Helix t. 9, f. 7. H. chittyana C. B. AD., 

 Contrib. to Conch., No. 2, p. 30. REEVE, f. 240. 



Nearly every specimen of this species shows, when closely 

 examined, numerous radiating zig-zag whitish markings, appearing 

 silvery upon the darker bands. Sometimes these markings are 

 reduced to mere flecks; but every specimen in good condition I 

 have seen shows this decoration. H. soror is sometimes somewhat 

 flecked above, but never has radiating zig-zag markings beneath. 



Var. CHITTYANA C. B. Ad. PL 27, figs. 67, 68. 



Generally more globose than the type, imperforate (in the 

 specimens I have seen) and conspicuously marked by radiating 

 zig-zag silvery flames. 



