Fig. 15. Interior of a pedicle-valve in which the “ shoe-lifter” is highly arched 
and the dental plates conspicuously thickened. 
Lower Helderberg group. Cumberland, Maryland. 
DICAMARA, Hatt. 
Page 772. 
Dicamara scatprum, F. Roemer. 
Fig. 16. Dorsal view of a specimen showing the cavities left by the removal of 
the ‘‘shoe-lifter” of the two valves, and the median septum of 
the brachial valve. 
Fig. 17. The interior of the brachial valve; from a gutta-percha impression. 
Middle Devonian. Pelm, Germany. 
Fig. 18. Ventral view of a specimen, showing the cavity of the ‘‘ shoe-lifter” 
and the form of the spiral cones. 
Fig. 19. Profile of the same specimen. 
Upper Devonian. Hartz Mountains, Germany. 
CAMAROSPIRA, Hatt. 
Page 776. 
Camarospira Evcuaris, Hall. 
Figs. 20, 21. Profile and dorsal views of a normal example. 
Corniferous limestone. Cayuga, Ontario. 
Fig. 22. A transverse section of the umbonal region; showing the spondylium 
and septa. 
Corniferous limestone. Cass county, Indiana. 
Fig. 23. A ventral view of a specimen so broken as to expose the spondylium, 
Corniferous limestone. Cayuga, Ontario. 
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