ORTIIALICUS. 203 



Columella. This character is shown in an exaggerated form in fig. 

 12, but the artist has overlooked it in drawing figures 15 and 16. 

 Another important feature separating yatesi from kelletti is the ab- 

 sence in the latter of the subsutural series of spots constantly present 

 in yatesi, and the smaller number of pit-sculptured nepionic whorls. 

 There are typically four bands of blackish-purple spots, the basal two 

 more or less united, on a yellow ground with dusky streaks; but in 

 specimens without cuticle the ground color is whitish, profusely 

 streaked with purple. About 2J whorls at the summit are uncolored, 

 the next whorl showing only a subsutural band of alternating dark 

 and white spots. This series of spots descends gradually during 

 post-nepionic growth, and becomes the upper band of arrow spots on 

 the last whorl. 



Var. sublabeo (" Dohrn " Ancey). 



Differs from the allied species P. yatesi in the shorter spire, more 

 slender, solid shell, more ovate, larger last whorl and consequently 

 wider aperture, the peristome being thicker, much wider, deep chest- 

 nut colored; columella straight, thickened within, scarcely twisted, 

 almost straight, forming a distinct angle with the base ; whorla less 

 numerous, 7, instead of 7 to 8 (Ancey). 



Amazonian region of Peru. 



Fig. 16 is probably referable to this ill-defined variety, though not 

 typical of it. 



Var. latevittata (Shuttleworth). PI. 43, figs. 12, 13. 



Shell elongate-ovate-conic, solid, nearly smooth, glossy; brown- 

 purplish or chestnut-purplish, ornamented with two to four rather 

 wide black-brown bands, interrupted by angulated straw-colored 

 stripes, and above having narrow blackish-purplish streaks. Spire 

 long conic, the apex as if cut off, the granulose nuclear shell narrowly 

 banded with blackish-purple ; suture bordered by an impressed line ; 

 whorls 7^, moderately convex, the last a little shorter than the spire. 

 Columella thick, plicate twisted, aperture scarcely oblique, truncated 

 oblong-oval, bluish inside ; peristome thickened, expanso-reflexed, 

 pale livid purplish, glossy, the margins joined by a somewhat thick- 

 ened whitish or livid callus, columellar margin sinuous. Alt. 85, 

 diam. 35 mill.; aperture, including peristome, 38 long, 22 wide. 

 (Shuttl.) 



Peru: Tarapoto (Moricand). 



