HELIX-PLANISPIRA. 283 



by a prominence inside ; aperture oblique, rounded-triangular, the 

 peristome a little thickened, rather widely reflexed, white, the mar- 

 gins moderately converging; upper margin deeply arched, basal 

 margin rather straightened, having an oblique, entering fold, 

 marked outside by a scrobiculation. 



Alt. 8, greater diam. 16, lesser 13 mill. ; length and breadth of the 

 mouth 7 mill. 



Islands of Batjan, Mar eh and Ternate, Ternate group, Moluccas. 



H. endoptycha MARTENS, Monatsb. d. Berl. Akad. 1864, p. 268 ; 

 Ostas. ZooL, Landschn., p. 301, t. 14, f. 2. ? Dorcasia compta H. 

 AD., P. Z. S. 1865, p. 414, t. 21, f. 8. WALLACE, 1. c., p. 408. 



This species is peculiar in the oblique impression on the last whorl, 

 visible as a prominence inside the mouth, and the uniform brown 

 color. Von Martens is disposed to consider H. compta H. Ad. to be 

 a synonym, believing that the presence of the oblique impression 

 was omitted in the description. 



H. compta H. Adams (pi. 45, fig. 31). Umbilicated, depressed, 

 thin, cinnamon-colored ; spire very shortly conoidal, apex obtuse ; 

 whorls 5, convex, slowly increasing, the last scarcely descending, 

 base compressed around the funnel-shaped umbilicus; aperture 

 oblique, lunate-rounded, pale and shining inside ; peristome whitish, 

 a little reflexed, margins conniving, basal arcuate, subreflexed. 



Alt, 62-, greater diam. 14, lesser 11 mill. Id. of Batjan. (Ad.) 



H. PORCELLANA Grateloup. PL 65, figs. 82, 83. 



Shell orbiculate-depressed, umbilicated, very shining, diaphanous, 

 yellowish above, white below ; spire retuse ; umbilicus excavated ; 

 aperture subovate, bidentate ; margin of outer lip reflexed ; white. 

 Alt. 9, diam. 15 mill. (Grat.) 



A charming species, characterized by its orbicularly compressed 

 form, nearly flat, but convex below, porcelain- white, very smooth 

 and shining. Spire much depressed, very obtuse ; last whorl two- 

 thirds the total altitude, with two yellowish brown transverse bands. 

 Suture visibly channelled. Umbilicus narrow, deep, funnel-shaped. 

 The aperture has behind and toward the base a large tooth-like 

 prominence, marked outside by a scar-like depression. Another 

 smaller tooth on the columellar margin. Whorls of the spire 5, 

 convex, finely obliquely striate. 



Island of Lombo/c, east of Java. 



