Figs. 39 to 41 
39 
40 
41 
Figs. 42 to 44 
Fig. 45 
Fig. 46 
Figs. 47 and 48 
47 
48 
Figs. 49 to 54 
54 
Figs. 55 to 61 
55 to 57 
58 
59 
60 and 61 
Figs. 62 to 64 
62 and 63 
64 
Figs. 65 to 67 
65 
66 and 67 
LYGSPLRA: DHCTPLENS MO ICI epee stares stale ale teria cle oh dette e eoeeteroee eee neste ated ole ie terete fale 
Upper side, showing slender volutions and distinct peripheral band; Murfreesboro, 
Tennessee. 
Lower side of same, with the apertural portions restored. The umbilicus is filled 
with shell-matter as in LZ. micula, L. progne and other species of the genus. 
(See plates LX VIII and LXIX.) 
Profile of same, natural size; also outline of upper surface and periphery of last 
whorl, intended especially to show the band in transverse section. 
LIOSPIRA/ MODEST AP IONTICH BS, ASEM icracrsneeictate ate sere Ware ot ste tel mere aebeteeyatags eptener erate 
Three views, x2, of a specimen from the Ctenodonta bed at Chatfleld, Minnesota. 
Since page 995, on which this shell is referred to as possibly belonging to L. 
abrupta, was printed, we have decided that it is sufficiently distinct to bear a 
name of its own. We propose, therefore, to call it LZ. modesta. 
MACLURINA,MANITOBENSIS WILCAVES/ SDs cm eric late 2710 ajo s(<. ewe sters'olees teietsl-taieel Oa erodes 
Inner whorls on the flat side of a specimen from Olinsted oan Minnesota, x2. 
MACLURINACUNEATA’ -WhITHEIMISDp: i. cere ceieste oe acts rin elec ore vrs cle eine teem seieyer</a/siatets 
Vertical section of a very young example, magnified nearly two diameters, show- 
ing that the inner whorls are widely umbilicated. The specimen is imbedded 
in the rock filling the outer whorl of the specimen of M. manitobensis showing 
the inner whorls as represented in fig. 45. 
SUBULITES’ REGULARIS U Sanat ieen.ia. silos cess wesc nonce vietcle scte coe naires siecle las 
(See also plate LXXXI, fig. 35.) 
Ventral view of a young specimen; High Bridge, Kentucky. 
Side view of a large specimen, from the same locality. 
STROPHOSTY DUS IRE XTTEIS Ui jand (Siege. oes Stier aeRO ner mee ees eece 
Cast of the interior from St. Paul, Minnesota, showing the usual form and several 
of the strong obliquely transverse furrows which occur so frequently, especially 
on interior casts, in this species. 
A more depressed cast from Fillmore county, retaining traces of external markings. 
Ventral view of a testiferous example from the vicinity of Cannon Falls, 
Minnesota. 
Dorsal view of an incomplete shell from the same locality. The surface markings 
are beautifully preserved on this specimen. 
View of aspecimen from Chatfield, Minnesota, from which a part of the last 
whorl was removed so as to show the spirally twisted folds of the columella. 
Surface of last whorl! of original of fig. 52, x5. 
@YCLONEMA GRACILE Ulrich, and varieties jc. cif... <2 sce cnte cules ols Slelcute= as clefeisis © sje) 
Three specimens of the typical form of this species, showing considerable differ- 
ence in their respective apical angles, Newport; Kentucky. 
Ventral view of aspecimen, from the same locality, referred to this species with 
some doubt. It may be an extreme form of C. subleve (plate LX XVIII, figs. 48 
and 49), but the upper whorls are more convex than in any of the numerous 
specimens of that species before us. 
Dorsal view of a rather small but perfect specimen of a form that, on account of 
the constant presence of delicate revolving lines, may be distinguished as var. 
striatellum. It occurs with the other varieties at Cincinnati. 
Two views of the apical whorls of same, x5. 
CYCLONEMA {(7HOLOP EA) EXMAT Um MOUNT CH er mayen ace oiataraieininvainie oloscleleiniar=(ejninatsinisieereeic ciate 
Opposite views of an excellently preserved example of this Holopea- -like shell. 
The surface on portions of the specimen is polished, and here exhibits traces 
of revolving lines as shown in the figures. 
Ventral view of a more ventricose individual. Both specimens were found in the 
vicinity of Cincinnati, Ohio. 
CY CLONEMACTRANSVIERSUM AUIPIGN <5: eretapsipiaiois a,ckeisteralotnisivls)eve) 2)e]oietaieiisiatela stetel cals akctemokete 
Dorsal view of the strongly marked specimen regarded as the type of this species; 
Covington, Kentucky. The two upper whorls are restored in the figure. 
Dorsal and basal views of a larger specimen which, while agreeing in probably all 
esseutial respects with the preceding, has a smoother surface with faint indica- 
tions of revolving lines on the periphery. 
995 
1041 
1042 
1072 
1064 
1062 
1063 
1062 
