AmBoca@LiA PLANOCONVEXA, Shumard. 
Fig. 14. Cardinal view of the specimen represented in Fig. 15, showing the 
cardinal areas, the incomplete deltaria and the chilidium. 3. 
Figs. 15, 16. Dorsal and profile views of an average specimen. 
Fig. 17. An enlargement of the surface, showing the short spinules. 
Coal measures. Iilinois and Kansas. 
VERNEUILIA, Hatt. 
Page 762. 
VERNEUILIA CHIROPTYX, de Verneuil. 
Figs, 18, 19, 20. Dorsal, cardinal and ventral views; showing the slight asym- 
metry of the shell and the bicinctate division of the surface. 
(DE VERNEUIL.) 
Middle Devonian. Paffrath, Germany. 
METAPLASIA, Hatt. 
Page 762. 
METArPLASIA PYxIDATA, Hall. 
Fig. 21. The interior of a brachial valve; showing the articulating apparatus, 
adductor scars and vascular sinuses about the muscular area and 
over the marginal regions. X 2. 
‘ 
Fig. 22, A cardinal view of the same valve; showing the linguate extension of 
the median sinus on the anterior margin. 
Fig. 23. The interior of a portion of a pedicle-valve; showing the narrow car- 
dinal area, thickened teeth and deep muscular scar. 
Fig. 24. An internal cast of the pedicle-valve; showing the impressions of 
divergent, probably vascular sinuses extending forward from the 
pedicle-cavity. 
Oriskany sandstone. Cayuga, Ontario. 
: 215 
