Figs. 1 to 6 
1 
2and 3 
a 
Figs. 7 to 10 
Tand 8 
Fig. 11 
Figs. 12 to 15 
12 
13 and 14 
15 
Figs. 16 to 18 
16 and 17 
18 
Figs. 19 to 22 
19 to 21 
22 
Figs. 23 to 26 
23 and 24 
25 
26 
PLATE LXVII. 
CONRADEDE AY OBEVQ UAT Wi AUG Siateate cote efalele.e oie) es tate Bledel leletelsh = otie|ejnlsyclsholelel=t=leli-lslell= ais = 
Lateral view of an almost perfect and unusually large specimen, showing the 
decided obliquity of the transverse lamellee which characterizes this species. 
Shales of the Black River group, Cannon Falls, Minnesota. 
Two views of another specimen, slightly exceeding the average size. St. Paul, 
Minnesota. 
Parts of two whorls of another specimen from St. Paul, x2, the slight denticula- 
tions of the edge representing the prominent lunule of the slit-band. The 
decline at the upper right-hand corner of the figure is at the beginning of 
the open slit. 
View of the back of part of the slit portion of a third specimen from St. Paul, 
«2, having unusually prominent imbrications. 
Dorsal surface, x4, of same specimen that furnished figure 4, showing salient 
slit-band with its distant lunule, and surface markings. 
Olorpasoreie/\ aplavariOAGWN (Wy Ghaval {S\. 5 5Gq6ga0ecceeen snub oncoo D4 Gos0debeCebeneucouGG 
(See also plate LXxIi.) 
Two views of a large specimen. Stones River group, Minneapolis, Minnesota. 
The umbilicus is filled with stony matter and the left side of the apertural 
expansion broken away in the original of these figures, but as the missing and 
hidden parts are clearly shown by other specimens, no apology is necessary 
for restoring them in the drawings. 
Portion of the terminal expansion and of the broken bases of two preceding 
expansions of same, x2.5, showing fine surface markings. The right 
margin of the figure represents the edge of the slit. 
Apertural view of a small specimen showing the expansion entire on one side. 
Geological and Natural History Survey of Minnesota, Museum Register 
No. 8724. 
CONRADELLA IMBRICATA Meek and Worthen Sp..........--..0-eecet ee eeee cece eee 
Lateral view of a small but highly characteristic specimen of this species. 
Trenton group, Alexander county, Illinois. 
CONRADELLA ELEGANS Miller sp....... Oe Ss GAS bade RRS o An aridt Coat OA npeOnen 
Lateral view of a specimen of the usual size, Lorraine group, Cincinnati, Ohio. 
Lateral view of the natural size, and apertural view x2, of the largest specimen 
seen; from the same locality. 
Small portion of the left dorsal slope of same, x4. 
CORMPADISIEA CRATOIS WINS casdeeed ba voodsosnobodooooDaDocKOUCDOU SO TOOUGOO SOUS 
(See also plate LXxir.) 
Two views of a large specimen of this species. Stones River group, Lebanon, 
Tennessee. The specimen occurred in solid limestone, one side being now a 
cast of the interior, while the other retains some of the shell with the broken 
bases only of the transverse lamelle. 
Small part of the side of another specimen showing the imbricating lamelle 
entire. 
CON BADE AMD R TANG jl ACRI Sim Wem CS ietetetetnfetel ote tsbecelerete eletoleictelole etcleletsialleeitetstelere=ttelele t= 
Lateral views of three specimens showing very decided variability in the 
number of the transverse imbrications. All are from the Stones River group; 
the first, from Beloit, Wisconsin, has unusually numerous imbrications; in the 
second, from Dixon, Illinois, they are much fewer in number; in the third, 
from Minneapolis, Minnesota, their number is not far from an average for 
the species. : 
Section of a specimen from Dixon, Illinois, cutting the whorls transversely. 
(QoS ADIO AA TOCA OMNAOegso5 coo ceds cobaobom ac concoe duu ouoUDoObemonoe oDoue 
Lateral and apertural views, the first of the natural size, the second ~2.4, of 
an apparently perfect example. Lorraine group, Covington, Kentucky. 
Part of a dorsal view of same x4, showing the slit-band and wavy surface 
imbrications. 
Small part of surface in a lateral view, x4. © 
907 
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