210 THE CHICAGO ACADEMY OF SCIENCES. 
Habitat; The specimens in this region have been found 
in rather low, damp or marshy ground. 
Remarks: This species is at once known by its semi-glo- 
bose form and its two brown bands. It is a rare shell in this 
area and the writer has been unable to obtain living specimens 
for study. The onlylocalities at present known are near Berry 
Lake, at Maywood andat Joliet. The-species is said to have a 
strong fetid odor. 
SuscGENus GONYODISCUS Fitzinger, 1833. 
“Shell: Rather small, depressed, with low but convex 
spire and open umbilicus. Apical 1% whorls smooth, the rest 
obliquely rib-striate, rather tubular, rounded or keeled at the 
periphery, unicolored or flamed with reddish. ele wide- 
lunate, the lip simple.” 
“Animal: Longand narrow, the foot white, head and back 
dusky blue. Sole equal in length to the diameter of the shell, 
undivided (having a central longitudinal sulcus when entering 
the shell or in alcohol); margins of foot having a wide border, 
bounded by a distinct groove, the grooves meeting above the 
tail. Upper surface coarsely granulated. Eye-peduncles long 
and slender, from one-third to one-half as long as the foot. 
Genital system lacking all accessory organs. The penis short, 
having the retractor and the vas deferens inserted at its apex. 
Spermatheca small, situated upon a very long simple duct, 
which enters the vagina very low. At the base of the albu- 
men gland there is a rather large talon. The albumen gland is 
small and adherent to the lower part of the hermaphrodite 
duct; the latter being large and very much convoluted.” (Pils- 
bry.)* 
For radula and jaw see following species. 
81. Pyramidula striatella Anthory, pl. xxviii, fig. 18. 
Helix striatella ANTHONY, Bost. Journ. Nat. Hist., Vol. III, p. 278, pl. 
iii, fig. 2, 1840. 
flelix ruderata ADAMS, Silliman’s Journ., lst Ser., 40, 408, not STUDER. 
Flelix cronkhitei NEwcComB, Proc. Cal. Acad. Nat. Sci., Vol. III, p. 
180, 1865. (Variety.) 
Pyramiduta striatella catskillensis PILsBRY, The Nautilus, Vol. XI, p. 
141, 1898. (Variety); Vol. XII, p. 86, 1898. 
Pyramidula striatella alba WALKER, Terr. Moll., Mich., p. 22, 1899. 
Shell; Flattened, thin, widely umbilicated; surfacecovered 
with crowded, oblique ribs, which are large and distinct, and 
*Guide to Studv of Helices, p. 46. 
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