Figs. 
Figs. 
Fig. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Ito” 5) 
1 
2 
3 
10 and 11 
12 to 15 
12 and 13 
14 
15 
16 to 19 
16 
17 and 18 
19 
20 to 24 
20 and 21 
22 and 23 
24 
25 to 28 
25 and 26 
27 
28 
29 to 32 
29 
30 
31 
32 
PLATE LXXII. 
PAGE, 
MOPHOSPLR AY BIGING WAH EN ALM Sp stacyse ssstaie sce eee obaetersteiges tare ere ssaleist eiieteteiareie trae siete nisieteneinns 964 
A perfect silicified shell of this species, from the lowest member (Satford’s Central 
limestone) of the Stones River group, at Murfreesboro, Tennessee. 
Portion of the last whorl of same, x2, showing the direction and regularity of the 
lines of growth. 
Right side of last whorl of fig. 1, x2. 
A large cast of the interior, on which some of the external lines of growth are 
obscurely preserved. Stones River group, Beloit, Wisconsin. 
Vertical section of an elongated specimen. Stones River group, Dixon, Illinois. 
MOBHOSRIRABOBLIO UA Uppal Ge Suetseciemmereeioe aloe eros ha ecctoianises aerate e oeleilactaee arctan 967 
Views of three specimens of this species. The general aspect is precisely as in L. 
bicincta, but the lines of growth are constantly more oblique beneath the 
peripheral angle and of a different character. Stones River and Trenton groups, 
Mercer county, Kentucky. 
HOPHOSELR AUP ROCHR Au Ulli Chkpearnemieeerericsmciri: AGUDOn OD BDDC era OE Tans onc ao. 968 
View of the type of this spevies, the basal portion restored in outline. Stones 
River group, Murfreesboro, Tennessee. 
LOPHOSPIRA QUADRISULCATA U. and S................ AAA ROD OSA. COT oO. OGG 967 
Opposite views of an excellent example of this species. Richmond group, Spring 
Valley, Minnesota. 
ILA OMHIRAY Tenoinaoys OMA Coc, choviaconsbdcasvnboqedoueaoddonocougEoonauopoaeenacebe 968 
Opposite views of a rather small specimen. Trenton group, near Burgin, 
Kentucky. 
Same specimen, x2, to show the lines of growth. 
Right side of last whorl of fig. 12, x6. 
HLOPROSATRA CONGRETEIUA We Binel Shoccdasdoans5e covanucocodbccuc eben ncooneddaubane 966 
A testiferous specimen from the Ctenodonta bed at St. Paul, Minnesota, showing 
the usual size and appearance. 
Opposite views of a smaller specimen from the same bed near Cannon Falls, Min- 
nesota. 
Portion of last whorl of same x6, showing the direction and regularity of the 
lines of growth, the extremely fine revolving lines and the form and character 
of the peripheral band 
ORHOSPINAGEIEEMORENGISs Uh an CU Sree ans mncElpyaemiciisetici cisttieeioniccsen niente 967 
Opposite views of two casts of the interior. Fusispira bed, Trenton group, 
Wykoft, Minnesota. 
A testiferous specimen from the same horizon near Fountain, Minnesota, natural 
size and a portion of the last whorl x2. The latter shows the surface markings 
which consist of rather coarse and distant lines of growth and a much finer 
intermediate set. 
The last whorl of a cast from the Wykoff locality, on which the stronger set of 
surface markings are rather distinctly reproduced. 
LOPHOSPIRA HELICTERES var. WISCONSINENSIS U. and S................eeeeeeeeee 971 
Two views of a cast of the interior of medium size. The apertural portion is 
perfect but the closely coiled upper whorls are broken away. Stones River 
group, Beloit, Wisconsin. 
A smaller cast from the same horizon at Minneapolis. Geological and Natural 
History Survey of Minnesota, Museum Register No. 6858. 
Small portion of the last whorl of another cast of the interior, showing strong, 
even lines of growth. From the same horizon at Dixon, Illinois. 
LOPHOSPIRA CONRADANA U. and S.. ...: fiubssdopionscodhvaon docaccenoeccee nT ee 979 
A nearly complete cast of the interior. Stones River group, Minneapolis. 
Under side of another cast from the same locality, showing the strong convexity 
of the under side of the whorls and a faint indication of the ridge which 
surrounds the umbilical cavity on the exterior of the shell. 
Another view of the original of fig. 29 to show anterior outline of the outer lip. 
The body whorl of another cast from Minneapolis showing, besides obscure 
lines of growth, a faint ridge beneath the peripheral carina. The latter is 
rarely seen on casts. 
