HELIX-EUHADRA. 103 



The shell has much the general form of H. peliomphala, and the 

 umbilicus is about as wide as in that species. The surface is shin- 

 ing, very roughly, irregularly marked y thread-like growth -striae, 

 which are very unequal in size, and are mostly of an opaque whitish- 

 color. Under a lens the close microscopic spiral stride characteristic 

 of this group become visible. The ground-color is straw-yellow or 

 whitish-corneous, more or less clouded and streaked with chestnut, 

 the latter color often forming a narrow band (interrupted by the 

 stride) above the periphery ; whorls 5, convex, slowly increasing, 

 the last rather strongly deflexed in front. Aperture very oblique, 

 broad-lunate, pinkish-brown inside ; peristome expanded, reflexed, 

 dark purplish-brown or rosy in color, thickened within, the thick- 

 ening white or brown. Basal margin somewhat straightened and 

 horizontal ; terminations of peristome approaching, joined by a thin 

 transparent callus. 



Alt. 20, greater diam. 30, lesser 26 mill. 



Alt. 18, greater diam. 27 1, lesser 23 mill. 



Kobe, Japan. 



H. nipponensis KOB. Jahrb. D. M. Gesell 1876, p. 31, 1. 1, f. 2. 

 H. congenita SMITH, Proc. Zool. Soc. Lond., 1878, p. 496 (wood- 

 cut). 



This species although closely allied to H. peliomphala may 

 probably be distinguished by its stronger striation, by the greater 

 deflexion of the whorl at the aperture, by the more straight- 

 ened and horizontal basal lip, and by the peculiarly mottled or 

 stained coloration. The umbilicus is either light or dark inside. 

 I have figured on pi. 41, figs. 4-7, three specimens from the suite 

 before me, showing variations in color-pattern. Figures 3, 4, of 

 plate 29 are Kobelt's typical nipponensis. Fig. 5 of the same plate 

 is copied from Smith's cut of congenita. The coloration of congenita 

 as Smith describes it, applies so well to part of the shells before 

 me that I quote him : 



The coloration of this species is not easily definable. The 

 ground-colour is pale straw, the oblique raised lirae being more 

 opaque and yellower. The body-whorl below the periphery is 

 stained with brown, or looks as if it were scorched. The coloring 

 takes the form of a very broad interrupted transverse band, or, in 

 other words, of wide blotches or stripes. The latter are sometimes 

 continued upon the upper half of the whorl, and are also here and 

 there faintly observable on the upper volutions. One specimen has 



