Figs. 
Figs. 
Figs: 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
i) 
1 and 
3and 4 
. 5and 6 
11 to 15 
11 and 12 
13 
14 and 15 
16 to 20 
16 
17 and 18 
19 
20 
21 and 22 
23 to 25 
23 
26 to 28 
29 to 31 
29 and 30 
31 
32 to 34 
32 
33 
34 
35 to 38 
35 
36 
37 
38 
PLATE LXXXII. 
PAGgeE. 
TRYBLIDIUM MODESTUM U. and S....... cece eee e eee ee rece cence ee ete e nent e eee cr eee 826 
Two views, dorsal and profile, of the specimen described. 
ARCHINACELLA PEROVALIS Whitfield sp......-......e- eee e eect eee e rete cece eens 830 
Dorsal and profile views of a cast of the interior from Minneapolis. (After Sar- 
deson, who called it Metoptoma explanata.) 
AROHINACELLA RUGATINA UWITiGh..- 2.2.5 c sce cece cc cen we ctw seer eer renenee 
Two views of a cast, apparently of the exterior, from Middletown, Ohio. 
SGENEIEE AGIA GINTEMIGAN Ua amd Gemerieiieate cetstetisielcleletolcig | slereiafelettelelsielelelo/el-l-i-i=)lelel=1=\<)1=/0 
Three views, in outline and restored at the apex, of the specimen described. 
SGENHTIA (OBTUSAl SATGESOM Spi cetic eles sitesi: lal leleinicl so wel clove elelelele\eleiel els eins. sieleae 
Dorsal view of a cast of the interior, from Minneapolis. ‘After ardent who 
called it Conchopeltis obtusa.) 
STENOTHECA EXSERTA SArdeSOM SP........ecee cece cere cece eee e eter ees eeteerceees 
Two views of asmall specimen presumably of this species; Minneapolis. Geolog- 
ical and Natural History Survey of Minnesota, Museum Register No. 715. 
Outline view of a large specimen from Beloit, Wisconsin, belonging to the collec- 
tion of the University of Wisconsin. 
Copies of Sardeson’s original figures of his Tryblidium exsertum, founded upon a 
specimen from the ‘‘ Blue limestone” at Minneapolis. 
SALPINGOSTOMA SCULPTILIS U. and S...... 20... ee cece ee eee cee eee e eect cence 
Lateral view of a partial cast of the interior from which the greater part of the 
apertural expansion has been broken away; Goodhue county, Minnesota. 
Lateral and dorsal views of a more complete cast of the exterior, showing the 
greater part of the expanded aperture, the dorsal slit and surface sculpture; 
from Goodhue county. Geological and Natural History Survey of Minnesota, 
Museum Register No. 7462. 
Portion of same, x5, showing slit-band and sculpture. 
Transverse section of inner half of last whorl of a cast of the interior from Fill- 
more county, Minnesota. 
SALPINGOSTOMA IMBRICATA U. and S......... Bebe pociaie Gap eSDORe eae aoc Ouee Toe 
Two views of the specimen described. 
OXYDISCUS SUBACUTUS, n. Sp. (UlITICh.)......... 0... eee eee eee ee ee eee eee eens 
(See also plate LXII, Figs. 62—65.) 
Lateral view in outline, each volution embracing about one-half of the preceding 
one. 
Ventral view of same, x2, to correct fig. 62 on pl. LXII. 
Side view of a similar specimen, x2, showing the slender inner whorls. Both 
specimens are from Danville, Kentucky. 
OXYDISCUS CRISTATUS Safford Sp... ...----...-c cece eee e ene eee s weeeeeres Pecoreocn 
Lateral view of the smallest of four specimens; Jackson county, Tennessee. 
Collection of Prof. J. M. Safford. 
Similar view of the largest specimen; Lindsley’s Hill, Tennessee. In this exam- 
ple the outer part of the last whorl is free from the dorsal keel of the preceding 
whorl. 
Portion of the dorsal keel of a large specimen, broken like fig. 27, showing the 
posterior extremity of the long slit; Nashville, Tennessee. 
CHOCAUEUS NEGEECDUS) Wea S erect oe - sleteielotelcleie elele aisle sfalala © aie viele ciejels)= eic-1-/0\a 1010) 
Lateral and basal views of the specimen described; near Cannon Falls, Minnesota. 
Upper two whorls of same, x2.5, to show the rounded terminus more clearly. 
EE TCOMOMAS GRIAGNOSA® Wi Cla yyetelstetetedeterfe)sisis'=ictel=/=) Sielele lol ote (oleh elekeel=l-islels\e\={elislsis)/ele!-'=\ le 
The upper side of a small specimen, x3, from High Bridge, Kentucky. 
Profile view of same, x3, showing the surface granulation more clearly than in 
fig. 32. 
Upper side of same, natural size. 
TOME AeA Rie Ata RA TLC Sey-teleratofolala/e clefarsveterersvarteloletelelelesiaketatelekelel afoiel-) e's isir svsieleiele siei-laler 
Under side of an average example. Murfreesboro, Tennessee. 
Upper side of another specimen. 
Profile views, x2, the lower line giving the form for the original of fig. 35, the 
line above it for that of fig. 36. The spire is sometimes more depressed. The 
line on the right of the figure is intended to show the contour of the ‘‘ band” 
and peripherial portion of the whorls. 
Oblique view of the umbilicus, x2, showing the crescent-shaped reflexion of the 
inner lip. 
842 
902 
914 
1020 
1035 
995 
