110 HELIX-LUCERNA. 



Yar. SUBSLOANEANA Pilsbry. PI. 27, fig. 69. 



The form is as in typical H. tridentina ; spiral bands obscure or 

 absent ; the entire surface yellowish-brown, more or less obscurely 

 streaked with lighter. General appearance much like H. sloaneana, 

 "but more carinate, perforate, and the basal lip tridentate. 



Alt. 14, diam. 28 mill. 



*** 

 H. OKENIANA Pfeiffer. PI. 34, figs. 8, 12, 13. 



Imperforate, depressed ; periphery rounded or obtusely keeled ; 

 solid, opaque, brownish above, paler beneath, all over very densely 

 minutely granulate, the granules arranged in rows like incremental 

 stria?; spire low, convex, rounded, apex plane, suture impressed at 

 apical whorl, then becoming linear ; whorls 4? to 5, the apical 

 sliavhtly convex, the following flat, the last convex above and 



O * 



beneath, deeply deflexed anteriorly, deeply 3-grooved or scrobiculate 

 behind the peristome, the outer groove the smallest. Aperture 

 sub-horizontal, transverse-oval ; peristome broadly expanded all 

 around, adnate over the umbilicus, terminations joined by a 

 parietal callus rather heavy at its edge ; basal margin bearing four 

 teeth within, the outer one quite small, joined to the third tooth by 

 a common elevation. Alt. 15, diam. 34; alt. 17, diam. 37 mill. 



Jamaica. 



H. okemana PFE. P. Z. S. 1845, p. 63; Monogr. i, p. 314; 

 onchyl. Cab. p. 440, t. 152, f. 11, 12. REEVE f. 225. H. fortis 

 C. B. AD. Contrib. to Conch., No. 5, p. 77. REEVE, f. 1476. 



Quite a distinct form. Body-whorl convex, depressed orbicular, 

 often slightly keeled. Whorls of the spire (except the apical two) 

 flattened, as in the preceding species of this group ; not convex, as 

 they are in all of the following species. Outer tooth of basal mar- 

 gin, and the corresponding scrobiculation behind the peristome 

 much smaller than the adjacent tooth, sometimes even obsolete. 

 (c/. H. atavus, in which the outer tooth is as large as the adjacent 

 one.) 



H. ATAVUS Shuttleworth. PI. 34, figs. 9-11. 



Imperforate, depressed semi-globose, solid, slightly shining, upper 

 surface brown, spire darker, periphery narrowly white banded, base 

 paler ; surface densely, minutely granulate all over, the granules in 

 rows in the direction of incremental stria? ; spire low, dome-shaped, 

 obtuse ; apex planulate ; sutures not impressed except at tip and 



