276 HALIX-PLANISPIRA. 



of triangular or crescentic spots ; beneath corneous, blotched and 

 streaked with white. Spire plane, a little sunken in the middle, the 

 suture rather deep. Whorls 4, moderately convex, the last rounded, 

 slowly descending in front, not constricted ; the base a little more 

 swollen behind the lip, and lightly impressed toward the moderate 

 umbilicus. Aperture diagonal, lunate-rounded, peristome simple, 

 white, margins converging, the upper rather widely expanded, 

 arched forward, basal margin expanso-reflexed, a little dilated at 

 the insertion. Alt. 9, greater diam. 21, lesser 17 mill. (-Pff.) 



Moluccas. 



H. embrechtiana (Mouss. in coll.) PFR., Novit. Conch, iv, p. 39, 

 t. 117, f. 7-9 ; Monogr. vii, p. 477. MARTENS, Mai. Bl. xx, 1872, 

 p. 154. 



This is a form of H. zebra having the zigzag stripes broken for 

 the passage of two spiral bands. 



H. IADD.E Pilsbry. PI. 68, figs. 92, 93, 94, 95. 



Shell umbilicated, subdiscoidal, the inner 3 whorls plane, not 

 perceptibly sunken ; yellowish-white with radiating interrupted 

 zigzags and numerous spiral lines of pinkish or olive corneous, pro- 

 ducing a mottled effect. There are usually two spiral chestnut 

 bands. Base rather swollen, somewhat constricted behind the basal 

 lip. Peristome expanded, basal lip reflexed. 



The shell is thin, quite veutricose, striate, mottled with opaque 

 huffish- white on a more translucent pinkish-corneous ground. 

 Upper surface convex ; whorls about 4t>, convex, the last descending 

 in front, slightly constricted behind the basal lip ; aperture very 

 oblique, large, oval-truncate, mottled and banded inside ; peristome 

 white, expanded, thin, the upper margin with a rather acute but 

 generally slight prominence in the middle, marked on the back of 

 the expanded lip by one little groove ; outer margin not more widely 

 expanded than the upper ; basal margin reflexed, not toothed, but 

 showing usually a barely perceptible thickening. 



Alt. 15, greater diam. 30 lesser 23 J mill. 



Moluccas. 



This is a species of the zonaria group. It is less solid than H. 

 zonaria, more ventricose ; but the base is much less swollen. The 

 basal lip has no tooth. The coloration is very peculiar, recalling 

 H. zebra and its color-variety embrechtiana in some respects, forms 

 from which this differs much in the shape of the aperture and the 

 flat, not concave spire. 



