298 HELIX-PLANISPIRA. 



ture transversely subelliptical, peristome expanded, white, moder- 

 ately thickened. Alt. 9, greater diam. 19, lesser 15 mill. (Mart.) 



Moluccas, Ceram. 



H. margaritis PFR. Zeitschr. f. Mai. 1850, p. 83 ; Conchy 1. Cab. 

 p. 354, t. 135, f. 19-21 ; Monogr. iii, p. 246. MARTENS, Preuss. 

 Exped. nach Ostas., Landschn. p. 307. H. zonulella Mouss. in 

 coll. teste MARTENS. 



Typical margaritis has two bands, the last whorl scarcely descend- 

 ing in front, aperture little oblique. 



Var. ZONULELLA Mouss. Bands 3, upper one interrupted ; last 

 whorl moderately descending; aperture very oblique. Alt. 7J, 

 greater diam. 16, lesser 12 mill. 



H. EXPANSA Pfeiffer. PL 46, figs. 69, 70, 71, 74, 75, 76. 



Shell narrowly umbilicated, inflated-discoidal, subtly striate, thin, 

 waxy-white, painted above with r.ufous-brown bands, unicolored be- 

 neath ; spire plane, apex a little immersed, suture pretty deep. 

 Whorls 4J, a little convex, the last inflated beneath, shortly descend- 

 ing in front, not constricted. Aperture diagonal, ample, lunate- 

 rotund ; peristome thin, reflexed, white, margins approaching, joined 

 by a thin callus, collumellar margin arcuate. 



Alt. 13, greater diam. 20, lesser 15, aperture alt. and width 11 

 mill. (Mart) 



Island of Batjan, Moluccas, on wooded hills. 



H. expansa PFR. P. Z. S. 1861, p. 22, t. 3, f. 8 (unrecognizable 

 fig.) ; Novit. Conch, p. 165, t. 45, f. 4-6 ; Monogr. v, 391. MARTENS, 

 Preuss. Exped. Ostas., p. 286, t. 14, f. 3. H. anozona MARTENS, 

 Monatsber. d. Berl. Akad. der Wissensch. 1864, p. 269. 



Above like H. margaritis ; beneath like H. corniculum. The 

 sutural band is sometimes wanting. 



H. MERSISPIRA Martens. PL 45, figs. 26, 27, 28. 



Shell narrowly umbilicated, depressed, striatulate, concolored, 

 whitish ? ; spire a little sunken ; whorls 4, a little convex, the last 

 depressed-rounded at the periphery, below more convex and obtusely 

 angulated around the umbilicus ; in front distinctly descending ;. 

 above moderately, beneath deeply constricted ; aperture very ob- 

 lique, lunate-circular ; peristome shortly expanded all around, rather 

 thin, white, margins rather approaching, the upper slightly, the basal 

 much arched. Alt. 11, greater diam. 24, lesser 18 mill. (Mart.) 



Island of Moti, Moluccas. 



