HELIX-PLANISPIRA. 275 



Umbilicated ; spire not raised ; bands continued on lip, 



Group of H. kurri. 



Surface without hairs or hair-scars ; shell umbilicated. 

 Last whorl with an oblique impression or pit outside, 



Group of H. endoptycha. 

 No prominent pit outside. 



Spire convex, lip rather narrow, suture white-bordered, 



Group of H. zonalis. 

 Spire plane or concave, Group of H. zonaria. 



Group of H. zonaria. 



Shell umbilicated ; the spire plane or sunken ; surface without 

 hairs or granulations, usually light and banded. Aperture wider 

 than high, very oblique. 



H. ZEBRA Pfeiffer. PI. 46, figs. 77, 78, 79, 80, 81. 



Shell umbilicated, discoidal, the inner two whorls of the spire 

 sunken ; yellowish or grayish white, having radiating zigzag brown 

 stripes above, and on the base often numerous colorless spiral bands. 

 Last whorl descending in front, rounded ; base not much swollen, 

 a little constricted behind the basal lip ; aperture oblique, rounded ; 

 face and back of the lip white. 



This species resembles some forms of H. zonaria but differs in the 

 rounder mouth, less swollen base, absence of a tooth on the basal 

 lip, and the absence of an oblique impression on the body-whorl be- 

 hind the lip. Whorls 4f . Alt. 10, greater diam. 23, lesser 18 mill. 



Island of Ceram, and islet of Goram. 



H. zebra PFR. Zeitschr. f. Mai. 1850, p. 83 ; Monogr. iii, p. 246 ; 

 Conch yl. Cab., p. 353, t. 135, f. 16-18. REEVE, Conch. Icon., f. 

 499. MARTENS, Ostas. Zool., Landschn., p. 315. TAPPARONE 

 CANEFRT, Ann. Mus. Civ. Genov. 1884, p. 153. H. zonaria var. a, 

 FER., Hist., t. 73, f. 5. H. guttata LE GUILLOU, Revue Zool. 1842, 

 p. 141 (not guttata, Oliv.). Planispira zebra WALLACE, P. Z. S. 

 1865, p. 409. 



The notes given above indicate the differences between this species 

 and H. zonaria. 



Var. EMBRECHTIANA Mousson, PI. 55, figs. 56, 57, 58. 



Shell umbilicated, depressed, rather thin, striatulate and sculp- 

 tured with microscopic spiral strise, shining, white, ornamented with 

 two rather wide corneous-chestnut bands and having above a series 



