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THE NATURAL HISTORY SURVEY, 209: 
volving brownish bands, one just above and one just below the 
periphery, the latter being gracefully rounded and never cari- 
nate; suturesimpressed; apex of shell smooth, without strie, 
which begin toappear on thesecond whorl; whorls six, rounded, 
regularly increasing; spireelevated, convex; aperture rounded, 
somewhat lunate, white and pearly inside, with the two revolv- 
ing bands showing distinctly; peristome sharp, simple, the 
terminations connected by a thin callus; columella somewhat 
dilated, subreflected; base rounded; umbilicus round, deep, 
showing the volutions very plainly to the apex. 
Gr. diam., 26.00; lesser, 23.00; height, 20.00; umbilicus diam., 5.50 mill. (7716.) 
as POS Se ae OO fe 19.00: Re ? 5.00 ‘ (7718.) 
+e Paes 28 21-00% 228 15.505 iz me 5.00 ‘ (12398.) 
Animal: Not examined (Fig. 49), but similar in form to 
alternata. 
Fie. 49. 
Animal of PyRAMIDULA SOLITARIA Say. (After Binney.) 
Jaw: ‘Long, low, slightly arcuate, ends but little attenu- 
ated, anterior surface striate, but without ribs; a median pro- 
jection to the cutting margin.” 
Radula: ‘‘The lingual membrane has 25-11-25 teeth, with 
14 perfect laterals. The transition to marginals is very grad- 
ual.” (Binney, Man., p. 255.) The teeth are similar to those 
of alternata. 
Genittaha: ‘The penis sack is short, stout, receiving near 
its apex the retractor muscle, above which it rapidly decreases 
in size, and at its apex receives the vas deferens; the last named 
organ is very peculiar in being greatly convoluted before enter- 
ing the penis sac; the genital bladder is small, globular, ona 
long duct, which becomes swollen at the lower end; the epididy- 
mis is convoluted in its entire course.’’* 
Distribution: Mississippi and Ohio Valleys; Northern 
Idaho; Eastern Oregon, etc. (Pilsbry); Washington (Hemp- 
hill), ; 
Geological distribution: Pleistocene; Loess. 
* #*Binney, Man. Amer. Land Shells, p, 255. 
