PAGE. 



Figs. 26 to 29 TROCHONESIA BELLULUM Ulrtch 1050 



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 T. 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 flg. 26. 



Figs. 30 to 34 TROCHONEMA SUBCRASSUM U. and S 1051 



30 Rather small silicifled shell showing the under side. 



31 and 32 Two views of a gutta percha impression, showing surface markings. 



33 A silicifled 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 oast. 



34 Lateral view of the specimen of which flg. 30 represents the under side. Upper 



part of Trenton group, Mercer county, Kentucky. 



Figs. 35 to 38 TROCHONEMA EETRORSUM U. and S 1051 



35 to 37 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. 

 38 A strip across the last whorl of same and the right side in outline, X 3. 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. 



Figs. 39 to 41 TUOCHONKMA ALTCM U. and S 1052 



Three views of a cast of the interior. Fusispira bed, Cannon Falls, Minnesota. 



Figs. 42 and 43 TROCHONEMA (EUNEMA) SALTERI U. and S 1053 



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. 



Figs. 44 and 45 TROCHONEMA (EUNEMA) NITIDU M Ulrich 1053 



Opposite views of an average specimen. Utica group, Covington, Kentucky. 

 The dark lines crossing the last whorl of flg. 44 indicate merely the direction 

 of the lines of growth. The latter are equal and exceedingly fine on the 

 specimen. 



Fig. 46 TROCHONEMA VAGRANS U. and S 1049 



(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. 



