Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Figs. 
Fig. 
26 to 29 
30 to 34 
30 
31 and 32 
33 
34 
35 to 38 
35 to 37 
38 
39 to 41 
42 and 43 
44 and 45 
46 
TROCHONEMA BELLULUM Ulrich.....:eeccectce tees ce ncessnceec cer eetccsceeecsccece 
Four views of the largest and relatively lowest of six specimens, all from the 
Stones River group, near Murfreesboro, Tennessee. It is to be observed that 
this is not only a smaller type than 7. eccentricum but that the lines of growth 
lean backward on the peripheral band instead of forward. The left side of the 
last whorl projects too far in fig. 26. 
TROCHONEMA SUBORASSUM U. ANG. S........e. cece cece ce cece ce cecet eee cerssseevece 
Rather small silicified shell showing the under side. 
Two views of a gutta percha impression, showing surface markings. 
A silicified specimen from which part of the shell has been removed. This speci- 
men shows that the shell is comparatively thick, the angles being very obtuse 
on the interior cast. 
Lateral view of the specimen of which fig. 30 represents the under side. Upper 
part of Trenton group, Mercer county, Kentucky. 
TROCHONEMA, RETRORSUM Ui, ANG) Soe cee cine oreo na elaine 4, 0)s\s\emicleseletnlelsie\elnialalel=/e!njelejelals 
Two lateral and a basal view of a testiferous example, showing the narrow and 
exceedingly abrupt umbilicus and the comparatively slight obliquity of the 
aperture. Black River group (Ctenodonta bed), Goodhue county, Minnesota. 
A strip across the last whorl of same and the right side in outline, x3. The lines 
of growth are very fine and regular. Their direction is peculiar; first because it 
is turned so strongly backward on the upper peripheral angle, and, second, 
because the backward sweep of the lines on the base is less than usual among 
Trochonemas of similar appearance. 
TR OCHONEMA “ALD UM (UW) cATIGL Site optare cites sticleleicistetn a'e's afe'aletelove/elalotele nfolel=tnyaletetalefes|=!-tel iui 
Three views of a cast of the interior. Fusispira bed, Cannon Falls, Minnesota. 
TROCHONEMA (HUNEMA) SALTERI U. and S........-. 0... cece eeeee eens cece ereewes 
Opposite views of a cast of the exterior chiefly, showing general] form of shell and 
lines of growth. Base of Fusispira bed, Cannon Falls, Minnesota. 
TROCHONEMA (EUNEMA) NITIDUM UITICh......... cess eee perce ecene eens cc cececres 
Opposite views of an average specimen. Utica group, Covington, Kentucky. 
The dark lines crossing the last whorl of fig. 44 indicate merely the direction 
of the lines of growth. The latter are equal and exceedingly fine on the 
specimen. 
TROCHONEMA VAGRANS U..dNd Sic ccs. nce tccee eee ce celt es toneeen sede neenesceereses 
(See also plate LXXVIII, figs. 10-13.) 
Gutta percha impression of a natural mould of the spire, showing external form 
and surface markings of shell. Vanuxemia bed, Minneapolis, Minnesota. 
1051 
1051 
1052 
1053 
1053 
1049 
