156 rORl'HYROBAIMlE. 



tricose, G9-75 mill, long, 35-37 in diameter, the last whorl being 

 longer than the spire." (Miller.') 



"Among the examples from Nanegal great variation occurs, as well 

 in form as in coloration. The following measurements of three shells 

 illustrates the former : 



"Alt. 78, diam. 45, length of aperture 46, width including peri- 

 stome 29 



"Alt. 09, diam. 35, length of aperture 40, width including peri- 

 stome 25. 



"Alt. 70, diam. 39^, length of aperture 41, width including peri- 

 stome 28. 



" In respect to coloring, the peristome is sometimes yellow, some- 

 times rose-red ; the ground-color of the shell is sometimes uniform 

 yellowish, sometimes dark clouded, the upper whorls either yellowish- 

 brown or dark violet-brown or white. 



"A variety from the valley of the Rio Cinto at Pichincha, 1300 

 meters alt., is quite unicolored, with stronger parietal callus, but no 

 nodule in the upper angle of the mouth." (Martens.) 



The jaw, according to Schacko, is similar to that of Orthallcus 

 obdttctus, composed of 17 plates, the median one triangular. The 

 teeth are of the form usual in the <). itndatits group, except that the 

 laterals are more massive, closely crowded and quadrangular. 



Miller describes two varieties: 



Var. KI.ONOATA Mill. (pi. 52, fig. 33). Last whorl hardly as long 

 as the spire ; peristome very strongly thickened and broadly retlexed. 

 AVhorls Hi, alt. 75, diam. 30, aperture 35 mill, long, 17 wide inside. 



Pilaton Valley (Boetzkes); Los I'/iaites, near Gualea, in abund- 

 ance (Cousin). 



Var. MINOR Mill. (pi. 52, fig. 35). AVhorls 6; alt. 58, diam. 26, 

 aperture -J.S mill, long inside, 14 wide. 



Pilaton Valley. 



P. GKKVII.I.KI ("Souerhy" Pfeifler). PI. 53, tigs. 38, 39, 40, 41- 



Sliell ovate-acuminate, moderately solid. Yrlloir, iritlt occasional 



(varireal) />rir,i sfrraks, ami nini.i'rinis irfftllarly scattered brairn 



spots sometimes shadowed on the side toward t/<r lif> with paler yellow. 



Surface slightly shining, coarsi'/i/ filiratnlate, puckered beneath the 

 ,-utiires, and ili'i-n\satnl In/ uride-tpaced spiral /ines, cutting the sur- 

 face-wrinkles into long granides. Spire rather .-lender, the lateral 



