EXPLANATION OF PLATK [. 



PAGB. 



Orthodesma cylindricum, n. sp., 22 



Fig. 1, left side of a good specimen; Fig. 2, left side of 

 another specimen ; Fig. 3, dorsal view of the same ; Fig. 4, 

 dorsal view of a smaller specimen somewhat injured. 



Bodmania insuetum, n. sp., 23 



Fig. 5, left side view ; Fig. 6, right side view of the same 

 specimen; Fig. 7, anterior end view of the same. 



Ambonychia cincinnatiensis, n. sp., 24 



Fig. 8, left valve of an old specimen ; Fig. 9, hinge of the 

 same specimen injured at the distal end of the lateral 

 teeth ; Fig. 10, hinge and lateral teeth of the left valve of a 

 younger and smaller shell. 



Pterinea cincinnatiensis, n. sp 25 



Fig. 11, the convex valve of a large specimen; Fig. 12, the 

 opposite valve of the same specimen; Fig. 13, the convex 

 valve of another specimen having the wings better pre- 

 served; Fig. 14, the convex valve of a smaller specimen; 

 Fig. 15, the opposite valve of the same; Fig. 16, the convex 

 valve of a very small specimen ; Fig. 17, the opposite valve 

 of the same. 



Pterinea rugatula, n. sp., 26 



Fig. 18, view of the left valve of a large specimen, having 

 some of the margin broken away; Fig. 19, view of the left 

 valve of a smaller and more perfect specimen. 



Technophorus faberi', S. A. Miller, 27 



Fig. 20, left valve of a large specimen. 



Bellerophon globularis, n. sp., 2s 



Fig. 21, dorsal view of a specimen not perfect at the aperture ; 



Fig. 22, dorsal view showing the lateral, backward curve of 

 the aperture. 



Bellerophon cincinnatiensis, n. sp., 29 



Fig. 23, dorsal view of a specimen preserving some of the 

 Surface ornamentation of the shell ; Fig. 24, ventral view 

 of the same specimen. 



