PAGE. 



Figs. 27 to 29 CONRADELLA DYERI var. CELLULOSA U. and S 910 



27 Lateral view, mostly in outline only, of a good specimen. Clitambonites bed, 



Trenton group, Cannon Falls, Minnesota. 



28 and 29 Small portions of the sides of the outer whorl, x4 and x8, showing the peculiar 

 surface markings. The right side of these figures is anterior. 



Figs. 30 to 33 CONKADELLA DYERI Hall Sp 909 



30 Lateral view, in outline, of a nearly complete shell. Richmond group, Butler 



county, Ohio. 



31 Apertural view of another specimen, x2. This specimen, now incomplete, was 



perhaps a half turn larger than the preceding. It is from the same locality. 



32 Part of the right side of same, x4. 



33 Inner whorls of same, xlO. 



Figs. 34 to 38 SALPINGOSTOMA BUELLI Whitfleld sp 900 



34 to 36 Three views of a fine cast of the interior, showing the expanded mouth, the 

 open dorsal slit, and obscure indications of the external markings. Stones 

 River group, Rockton, Illinois. Geological and Natural History Survey of 

 Minnesota, Museum Register No. 7318. 



37 Dorsal view of a specimen from Beloit, Wisconsin, retaining some of the external 



markings. 



38 Apertural view of a specimen from the Vanuxemia bed at Minneapolis belonging 



to the Geological Survey collection (Museum Register No. 5544), and doutfully 

 referred to s. buelli. In this specimen the apertural portion of the internal 

 castas been removed and the remaining radially marked expansion therefore 

 represents an impression of the exterior of the shell and not of the interior. 



Figs. 39 and 40 SALPINGOSTOMA UICHMONDENSIS Ulrich 903 



Two views of a nearly complete cast of the interior, from Richmond, Indiana. 



Figs. 41 to 44 BUCANIA PUNCTIFRONS Emmons 894 



41 Apertural view of a good specimen. The reticulated surface markings are omitted 



except on the umbilical slope on the right side of the figure. Lower part of 

 Trenton group, Nashville, Tennessee. 



42 Small portion of the markings of same, x5. 



43 Lateral view of another specimen, from the same locality, showing several inter- 



ruptions in the regular growth of the shell. The surface ornamentation was 

 drawn on a portion of the outer whorl only. 



44 Part of dorsum of same, x2.4, showing the slit-band and surface markings to the 



first interruption, the latter being at the top of the figure. 



Fig. 45 BUCANIA SIMUJATRIX U rich 892 



(See also plate i.xin. i 



Lateral view of the specimen illustrated on plate LXIII. It is a cast of the 

 interior and almost perfect. Imperfect specimens are very liable to confusion 

 with the associated Salpinqostoma richmondensis figured on this plate. 



Figs. 46 to 48 BUCANIA CBA88A Ulrich 893 



Three views of the most complete example seen, showing the thick shell and 

 obscure remains of surface markings. Richmond, Indiana. This specimen has 

 suffered considerably from maceration. Other, less complete, individuals 

 exhibit a rounded dorsal band which, however, does not materially affect the 

 almost uniform convexity of the back of the whorls. 



