MACIIODONTES. 35 



A sjiecimen from Cubatad, Sao Paulo (pi. 13, fig. 97), differs trom 

 the type in being darker colored, of a dark reddish-chestnut hue, 

 somewhat more solid, with the denticles on the outer lip and colu- 

 mellar margin subobsolete. hardlv noticeable, and of the reddish color 

 of the lip itself; the pits behind the lip are correspondingly obsolete, 

 but there are two minute white denticles on the columellar fold. This 

 shell measures: alt. 2(.'>, diam. 10 mill. ; length of aperture 11, width 

 (H mill. 



M. DEGRNERATL-S Pilsbry. PI. 13, figs. 98, 99. 



Shell oblong-turreted, perforate and rimate, thin but moderately 

 strong, pale yelhwish- green. Surface hardly shining, striated in the 

 direction of growth-lines, the stria- hardly visible without the aid of 

 a lens, under which they are seen to be thread-like, well raised, 

 finely but rather superficially cut into beads by decussating spirals 

 which crenulate the summits of the stria-. Spire convexly conic, 

 the apex obtuse ; whorls f^, quite convex, the earlier H densely 

 striated spirally, the last whorl becoming free and somewhat de- 

 scending in front, constricted and showing 3 small pits behind the 

 outer lip, bicarinate at base, the keels short, outer one strongly 

 pinched up, the inner low, rounded, a distinct depression between 

 them. Aperture oblique, squarish-oblong, nearly one-third the total 

 length of the shell, obstructed by a strong columellar fold which 

 bears a transverse lamella below, and by G small, tuberculiform sub- 

 obsolete teeth: one upon the parietal margin close to its posterior 

 termination, three upon the outer lip, the uppermost (suprapalatal) 

 quite small, and with the parietal denticle, defining a small rounded 

 posterior sinus or notch, the upper and lower palatal folds low, 

 removed from the lip-edge ; basal fold median; a small subcolumellar 

 tooth below the transverse columellar lamella. Peristome white, 

 narrowly reflexed, continuous and free throughout. Alt. 21^, 

 greatest diam. 8^, length of aperture 7 mill. 



Brazil : Palmeiras, Province of Parana, (Dr. H. von Ihering). 



0. (Macrodontes) deyi'iu'nitns Pll.S., Proc. Acad. Xat. Sci., Phila., 

 1898, p. 473 (Jan. 13, 1.S99). 



Very unlike other known species in the pale green color and 

 short aperture with degenerate teeth. 



