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. If. stragulum. 



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

 subtranslucent. H. sepulchralis, funebris, atroposf, eurychila, ex- 

 coriata, cadaverosus. 



H. SEPULCHRALIS Ferussac. PL 3, figs. 38, 39, 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 4J, 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 FER., 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. REEVE, 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- 



