STKOBILOPS OP SOUTH AMERICA. 41 



a short columellar lamella and three basal folds (fig. 8), the 

 inner fold short, the second long, arcuate, the third long and 

 straightened. 



Height 2.3, diam. 2.6 mm. ; 53-4 whorls. Type. 



Height 2.1, diam. 2.55 mm. Paratype. 



Brazil : Para, under the bark of a decaying tree in the dense 

 forest surrounding the water works of the city (Fred Baker). 



Strohilops hrasiliana Fred Baker, Proc. A. N. S. Phila., 

 1913, p. 647, pi. 21, f. 8, 9 (Jan. 28, 1914). 



This species stands near S. morsei, differing by the well- 

 developed ribs and the more convex lateral outlines of the 

 spire. The ribbing is represented as nearly regular in the 

 original figure and in our fig. 9 ; but it is noticeably irregular 

 in all of the eight specimens found, which are now No. 109310 

 of this collection. 



10. Strobilops helleri (Dall). PI. 6, figs. 1, 2, 3. 



The shell is solid, much wider than high, dome-shaped 

 above, with obtuse apex, convex beneath, with an acutely cari- 

 nate median periphery and a widely-open umbUicus contained 

 about four times in the diameter. The whorls are convex, 

 with a concavity just above the keel. Cinnamon-colored, with 

 little gloss; first 1% whorls smooth, after w^hich they are 

 finely, sharply costulate, the riblets becoming coarser and 

 more spaced on the last whorl, weak on the projecting keel, 

 rather close and somewhat irregular on the base (fig. 1). 

 The lip is expanded, thickened, a little angular at the outer 

 extremity, reflected at the columellar insertion. Parietal callus 

 heavy. The parietal lamella is rather low, enlarging near its 

 end, which does not quite reach the edge of the parietal callus. 

 Very deep in the throat a low, infraparietal lamella can be 

 seen in an oblique view in the mouth. At the last third of 

 the base two basal folds can be seen by transparence through 

 the base. 



Height 1.9, diam. 3.1 mm., umbilicus 0.8 nun. ; 414 whorls. 



Galapagos Islands : near Iguana Cove, Albemarle Island, at 

 2000 ft. elevation (Snodgrass and Heller). 



