150 HELIX-ISOMERIA. 



sinuous, produced at the place of the peripheral angle and recurved, 

 below this recurved loop there is a strong compressed-conical tooth, 

 tipped with white ; basal margin straight, with a blunt tooth and 

 several small subobsolete folds ; parietal wall calloused ; umbilicus 

 almost completely covered by the expanded columellar insertion of 

 the peristome, which is appressed to the tumid base for a short dis- 

 tance. 



Alt. 16, diam. maj. 33, min. 28 mill. (Specimen.) 



Alt. 17, diam. maj. 37, min. 30 mill. (Smith.) 



Malaeatos, South Ecuador. 



Helix (Isomeria) Gealei E. A. SMITH, Proc. Zool. Soc. Lond. 

 1877, p. 361, t. 39, f. 9. COUSIN, Bull. Soc. Zool. France 1887, p. 

 69. 



This species is remarkable for its sinuous peristome, bronze-green 

 in color, and very iridescent. It is allied to the tw T o preceding species. 

 The sinus in the middle of the outer lip is similar to that of some 

 species of the section Labyrinthus. Mons. Cousin errs in quoting 

 Mesembrinus geali Ad. in the synonymy of this species, and giving 

 the locality " Mexico ; " that species being a Mexican Bulimulus. 



H. STOLTZMASNI Lubomirski. PI. 57, figs. 28, 29, 30. 



Half-covered umbilicate, depressed, solid, striate, striae oblique, 

 very minutely granulated; color deep chestnut; spire somewhat 

 convex, scarcely elevated; whorls regularly increasing, the last 

 carinated, deflexed anteriorly; base inflated toward the aperture; 

 aperture very oblique, small, axe -shaped ; peristome purplish-fulvous, 

 thickened, reflexed, angular at the carina, the terminations connect- 

 ed by a cord-like white callous; there is a single conical denticle be- 

 low the carina, on the outer lip. (Lubomirski.) 



Alt. 17, diam. maj. 40, min. 33 mill. 



Montana de Palto, Tambillo, Dist. of Chota, Peru. 



H. (Isom&rm) stoltzmanni, Prince LADISLAS LUBOMIRSKI in Proc. 

 Zool. Soc. Lond. 1879, p. 720, t. 55, f. 4-6. 

 The type is in the Museum of Varsovie. 



H. ^QUATORIA Pfeiffer. PI. 48, figs. 44, 45, 46. 



Covered or narrowly umbilicate, depressed, solid, deep chestnut- 

 colored ; surface shining, finely striatulate, minutely, subobsoletely 

 granulate, not malleated ; spire very low-conoidal, apex obtuse, first 

 two whorls polished; sutures moderately impressed; whorls 5J, 



