176 HELIX-LABYRINTHUS. 



H. BOGOTENSIS Pfeiffer. PL 42, fig. 40. 



Umbilicated, depressed, flattened, not very solid, acutely keeled ; 

 color dark chestnut, more or less dotted, especially beneath, with 

 tiny golden flecks ; surface somewhat shining, obliquely striate, 

 densely granulate under a lens ; spire almost plane, scarcely convex ; 

 sutures not impressed, often marginated ; whorls 4i, rather rapidly 

 widening, the last depressed, acutely keeled, very deeply, very 

 abruptly deflexed in front, deeply constricted behind the lip, with 

 two deep pits on the base and one above the carina there ; base 

 convex ; aperture subhorizontal, obstructed by large teeth ; peristome 

 continuous, white or flesh-tinted, the parietal margin elevated, emar- 

 ginate in the middle, and giving rise to a very high erect entering 

 plate-like tooth ; basal margin with a large bifid outer tooth, and 

 two blunt tubercular folds toward the columella ; upper margin just 

 above the carina produced into a blunt tooth. Umbilicus broad, 

 showing all the whorls. 



Alt. 14, diam. maj. 39, min. 35 mill. 



Alt. 14, diam. maj. 37, min. 33 mill. 



Sante Fe de Bogota. 



H. bogotensis PFR., Proc. Zool. Soc. Loud. 1854, p. 288 ; Mon- 

 ographia Hel. Viv., iv, p. 305. REEVE, Conch. Icon., f. 1381. 



Most closely allied to H. dunkeri, but distinguished at once by its 

 large size. 



H. OTOSTOMA Pfeiflfer. PL 64, fig. 29. 



Narrowly umbilicated, sub-lens-shaped, solid, acutely carinated, 

 striate and finely granulate, olive-blackish or chestnut-colored ; spire 

 subconoid-convex, obtuse ; whorls 5, nearly plane, the last convex, 

 abruptly deflexed in front, profoundly scrobiculated above and 

 beneath the carina ; aperture very oblique, subrhomboidal-ear-shaped, 

 ringent ; peristome continuous, sinuous on the penultimate whorl, and 

 giving rise in the middle to a long entering lamina ; upper margin 

 of peristome with an obtuse conical tooth ; basal margin subangu- 

 larly descending, the left side bearing a strong, subcompressed tooth ; 

 the right side a bifurcating one. (Pfeiffer.} 



Alt. 13, diam. maj. 31, min. 26 mill. 



Andes of Colombia. 



H. otostomn PFEIFFER, Proc. Zool. Soc. Lond. 1851, p. 260 ; Mon- 

 ographia, iii, p. 255. H. stostoma REEVE, Conch. Icon., f. 551. 



Differs from H. bogotensis in having a single, not double, colum- 

 ellar tooth. 



