18 HELIX-AMPELITA. 



species have a tendency toward the formation of a slightly saliant 

 point in the middle of the upper lip, marked by a slight groove 

 behind the revolute peristome. The following analysis of species 

 may perhaps be of use. 



(1.) Umbilicus constricted and narrowed within ; upper surface 

 of body- whorl with a spiral depression ; parietal callus strong, 

 opaque. H. hova, lamarei, sakalava, watersi. 



(2.) Umbilicus wider ; body-whorl not grooved above ; parietal 

 callus strong, opaque. H. subsepulchralis. 



(3.) Umbilicus narrow ; parietal callus thin. H. stragulum. 



(4.) Umbilicus broad, open to the apex ; parietal callous thin, 

 subtranslucent. H. sepulchralis, funebris, atropos?, eurychila, ex- 

 coriata, cadaverosus. 



H. SEPULCHRALIS Ferussac. PI. 3, figs. 38, 89, 40, 41, 42. 



Shell widely perspectively umbilicate, broad and depressed, with a 

 spiral depression ascending the spire on the upper surface. 



Broad, subdiscoidal, solid, opaque, dark chocolate colored, lighter 

 chestnut on the spire, and often with a light zone bounding 

 the umbilicus. Surface shining, nearly smooth, with fine growth- 

 strise and ill-defined fine spiral lines ; under a lens seen to be very 

 densely and minutely but obscurely granulate. Spire low, apex 

 whitish ; sutures deep. Whorls 4, convex, usually with a depres- 

 sion around the outer part ; the last whorl very wide, concave and 

 sloping above, but tumid just below the sutures, convex and slightly 

 flattened on the base, a little descending at the aperture. Aperture 

 very oblique, bluish inside, the outer and upper lips broadly expanded, 

 reflexed, basal lip narrowly expanded and reflexed ; terminations of 

 the peristome approaching, connected by a thin translucent callous. 

 Umbilicus broad, funnel-shaped, showing all the whorls to the apex. 



Alt. 23, greater diam. 48, lesser 36 mill. 



Alt. 20, greater diam. 39, lesser 30 mill. 



Madagascar. 



H. sepulchralis FEB., Histoire, t. 75, f. 1 ; t. 75 C, f. 4, 5, 11, 12. 

 PFEIFFER Monographia i, p. 374 (description but not synony- 

 my !) ; Conchylien Cabinet, p. 104, t. 14, f. 5, 6? ANGAS in P. Z. 

 S. 1877, p. 803, t. 80, f. 1, 2. KEEVE, Conch. Icon., 147a H. la- 

 brella LAM. An. s. Vert., p. 73. CHENU, Illust. Conchyl. iii, t. 5, 

 f. 14. 



This species has a broader umbilicus than either hova or lamarei. 

 The last whorl is obliquely waved or wrinkled in the spiral depres- 



