304 THE CHICAGO ACADEMY OF SCIENCES. 
to shining, covered with numerous crowded growth lines crossed by 
several elevated spiral lines and by numerous very fine impressed spiral 
lines ; in many specimens the last whorl, and frequently the whole shell, 
is heavily malleated; the whorls are sometimes encircled by coarse 
wrinkles, and frequently the epidermis is so arranged as to show longi- 
tudinal stripes of white and horn color, alternating; whorls seven, 
rounded, the last varying in its rotundity but usually quite obese; spire 
sharp and pointed, varying from over half to three-fifths the length 
of the entire shell; sutures well impressed; aperture varying from 
roundly-ovate to long-ovate, more or less expanded; peristome thin, 
acute, sometimes expanded, in old specimens or at resting stages thick- 
ened by a heavy deposit or varix within; the peristome is white and 
there is a band of very dark brown which edges the varix; inner lip 
closely appressed to the parietal wall, forming a heavy callus, which 
in some specimens is so extensive as to make an almost continuous 
aperture; axis twisted, forming a rather heavy, ascending columellar 
plait; umbilical chink generally very narrowly open, but sometimes 
closed. 
Length. Breadth. Aperturelength. Breadth. 
20.00 10.00 10.10 5.00 mill. Type nuttalliana 
20.50 10.00 10.00 5100 “ haydenti 
23.00 11.50 E25 6505s “ex pansa 
24.00 11.50 13.50 550 = # = 
23.50 11.00 12.50 6.00 “* “— sufflatus 
32.00 11.50 14.50 7.00 “ Alpena, Mich. 
31.50 14.00 15.50 OOM ies "y 3 
27.00 12.00 13.50 6.80 ~ rf - 
21.50 10.00 11.00 Rohe as a re 
24.50 12.00 12.50 6:25) a Calatonnias 
28.00 12.50 14.00 6:50) 2) OwascombakerNee 
31.50 14.00 15.50 a5 On ie 2 a 
21.00 11.00 10.00 yell) 
21.00 10.50 11.00 C100 Mme Halma, Minn. 
24.00 11.50 12.00 5.50) : : 
32.00 10.00 10.50 5.50 ~ ¢ 
22.00 8.50 10.00 A050 ae 
28.00 11.00 12.50 6.00 “  Braddock’s Bay, N. Y. 
28.00 12.00 15.00 TAO 0a is ‘ 
23.00 11.00 11.75 GlO Ones Seattle, Wash. 
9.50 4.50 5.00 Pei Indiana. 
11.00 5.00 5.00 2.50 “ Alpena, Mich. 
10.75 5.00 5.50 240 a Joliet, Ill. 
11.25 4.90 5.25 200° +> i i 
Types: Expansa Hald., Academy of Natural Sciences, Philadel- 
phia, two specimens, No. 58533; nuttalliana Lea, Smithsonian Insti- 
