280 HELIX-PLANISPIRA. 



Planispira. The surface is but little shining, is regularly, delicately, 

 but very distinctly obliquely striated. Whorls 5 or nearly that, the 

 last rounded above, below and at the periphery ; in front it descends 

 more or less deeply ; and on the base is somewhat swollen. Aper- 

 ture very oblique, oblong-truncate ; peristome very broadly ex- 

 panded all around, the basal margin obsoletely toothed. The upper 

 margin has a blunt projection in the middle, caused by a pit behind 

 its expansion, this pit having several short grooves running toward 

 the lip-edge, like those produced by sharply folding paper and then 

 nearly straightening it. 



Alt. 12, greater diam. 28, lesser 2! mill. 



Alt. 12, greater diam. 24, lesser 18 mill. 



Moluccas. 



This species differs from H. zonaria and all its varieties in being 

 much more distinctly striated ; the inner whorls less sunken ; there 



V 



is a wide pit behind the middle of the broadly flaring upper lip, and 

 the base is far less swollen. In H. zonaria the swelling continues to 

 within a short distance of the basal lip, and there the base is deeply, 

 narrowly constricted ; in H. chariessa the swelling is far less marked, 

 and gradually decreases some distance behind the basal lip. In 

 zonaria the basal lip is rather narrowly reflexed, whilst in chariessa 

 it is broadly flaring, and has on its reverse, short, narrow marks, 

 like those in the pit behind the upper lip. The umbilicus is rather 

 wide, permitting all of the whorls to be seen. Numerous specimens 

 from two sources are before me, but without exact locality. 



The form of this shell reminds one of Avipelita sepulchralis of 

 Madagascar. 



H. QUADRIFASCIATA LeGuillou. PI. 56, figs. 82, 83, 84. 



Shell rather widely umbilicated, depressed, striatulate, horny- 

 white, 4-banded with reddish ; lower band at the umbilicus ; spire 

 scarcely projecting; whorls 4?, a little convex, the last veutricose, 

 the last whorl descending to the middle of the space between the 

 two median bands, obliquely swollen, then deeply constricted. 

 Aperture very oblique, lunate-half-ovate, the peristome slightly 

 thickened, reflexed, white, the margins a little approaching, nearly 

 equally arched, the basal margin with one tooth. 



Alt. 8, greater diam. 17-18, lesser 13-14 mill. (Mart.} 



Dodingo, 1st. of Halmalieira ; Isl. of Ternate, Moluccas. 



H. quadrifasciata GUILL. Rev. Zool. 1842, p. 141 . PFR. Monogr. 

 i, p. 381. MARTENS, Ostas. Zool., Landschn., p. 300, 1. 16, f. 4 ; and 



