104 HELIX-LUCERNA. 



more than 5, subplanulate, with a slightly impressed suture; last 

 whorl with an acute periphery, above which it is concave in its last 

 half, and below which it is slightly concave in its first half; aperture 

 subtriangular, with the lower outline much curved, with one moder- 

 ately-developed tooth below near .the right side ; labrum well re- 

 flected, moderately thickened ; umbilicus wanting. (Adams.) 

 Alt. 23, diam. 50 mill. 



H. nobilis C. B. AD. Contr. to Conch, no. 7, p. 106. PFR. 

 Monogr. iii, p. 215 ; iv, p. 246 ; v, p. 319. 



Undoubtedly another variety, allied to gouiasmos. Adams' orig- 

 inal description is given above. Figure 64 is drawn from a typical 

 specimen. Figures 59, 63, represent mutations of the same variety. I 

 am inclined to consider PfeiflTer's H. abnormis an abnormally elevated 

 form of nobilis. 



H. ABNORMIS Pfeiffer. PI. 34, fig. 7. 



Imperforate, trochiform, solid, minutely granulated, scarcely 

 shining, rufous, above white ; spire conoidal, obtuse ; whorls 5*, 

 convex, slowly widening, the last scarcely descending anteriorly, 

 nearly rounded at the periphery ; base plane ; aperture nearly 

 horizontal, rotund-lunar ; peristome subthickened, the margins par- 

 allel, joined by a thin callus ; upper margin slightly expanded, basal 

 margin with a conical tooth on its right side, somewhat dilated, 

 reflexed and adnate in the region of the umbilicus. 



Alt. 23, diam. 42 mill. (Pfeiffer.) 



Jamaica. 



H. abnormis PFR., P. Z. S. 1854, p. 56 ; Monogr. iv, p. 240 ; v, p. 

 311. REEVE, f. 1275. 



I have above expressed the opinion that this form is a modification 

 of H. nobilis Ad. That species is frequently rounded at the periph- 

 ery, or only bluntly angular. H. abnormis is probably abnormal. 

 I have seen no specimen just like it among the hundreds of Jamaica 

 Helices I have examined. 



H. CHEMNITZIANA Pfeifter. PI. 30, figs. 43-45. 



Imperforate, depressed, acutely carinated, solid, opaque, brown, 

 scarcely shining ; surface minutely granulate all over ; spire low, 

 obtuse ; apex flat ; sutures linear ; whorls 4-5, flat, their lower 

 margins regularly undulated by short low folds of the -upper surface ; 

 body-whorl very convex below, generally with a dark spiral band on 



