PLATE Vil 
Fig. 1.—Carbonicola acuta. Left valve, showing single median cardinal tooth. 
From the Cockshead Rock, Adderley Green. My Collection. (Page 50.) 
Fig. 2.—Carbonicola acuta. Right valve, showing a slight indication of a 
posterior lateral tooth. Same locality. My Collection. (Page 50.) 
Fig. 3—42.—Carbonicola acuta. A series from the same locality, exhibiting 
several variations in detail and form of the hinge apparatus. (Page 50.) 
Fig. 43.—Carbonicola acuta. A left valve from the Collection of the Wood- 
wardian Museum, Cambridge, from Bradford, Yorkshire, showing the absence of a 
posterior lateral tooth. (Page 50.) 
Fig. 44.—Carbonicola subconstricta. A right valve from the same Collection 
and locality, showing a posteriorly diverging cardinal tooth with a corresponding 
pit posterior to it to receive the cardinal tooth of the opposite valve, and the absence 
of a lateral tooth. (Page 59.) 
