HELIX-AULACOSPIRA. 197 



H. (Plectotropis) marietta H. AD. P. Z. S. 1870, p. 377, t. 27, f. 

 5. H. (Cathaica) marietta MLLDFF. Helix marietta HEUDE, 

 Moll. Terr. Fl. Bleu, p. 108, t. 28, f. 8, 8 a. 



Heude has given figures of a form with flatter spire and more 

 obtuse apex, which may be called var. submariella (pi. 55, figs. 27- 

 30). 



A variety aquila is described by H. Adams as being smaller, 

 tawny, with higher spire, the last whorl less convex. This may be 

 the same as H. innominata Heude. 



H. INNOMINATA Heude. PI. 55, figs. 24, 25, 26. 



Shell rather narrowly umbilicated, depressed lens-shaped, being 

 about equally convex above and below the acute white peripheral 

 keel; reddish-brown, fading to horn-colored around the umbilicus 

 and at the lip. 



Spire conical ; whorls 44, separated by deeply channelled sutures ; 

 the inner U-lf whorls convex, forming an elevated but rather 

 obtuse nuclear shell, which is bluntly if at all angular at the pro- 

 jecting periphery ; following whorls finely marked by oblique 

 growth-lines, shining, convex, becoming concave above the peripheral 

 keel, which projects on all the whorls. Last whorl descending to the 

 aperture ; base convex, microscopically and superficially granulated. 

 Aperture very oblique, oval, the peristome thin, expanded above, 

 reflexed beneath and at the umbilicus, its terminations converging 

 and joined by an aduate parietal callus. Width of the umbilicus 

 contained 7-8 times in the diameter of the shell. 



Alt. 6, diam. 12 mill. 



Alt. 6i, diam. 14* mill. 



Kin-cha, Kiang River, China. 



Helix innominata HDE., Moll. Terr. Fl. Bleu, p. 108, t. 28, f. 7. 

 Described from specimens received from Heude. Compare H. 

 marietta Ad. 



Section AULACOSPIRA v. Moll., 1890. 



The following key is given by v. Mollendorff: 

 Key to Species. 



a. Carina extending to the aperture ; peristome continuous, free ; 

 section Micropetasus. 



