TAB. XXVIII. 



Fig. 



1. Mya truncata, p. 277. 



a, b, from Coralline Crag, at Ramsholt. 



c, var. Uddevallensis. From the Clyde Beds. 



d, e, var. pullus. From the Red Crag, at Butley. 



2. Mya arenaria, p. 279. 



a, I, from the Red Crag, Sutton. 



d, e, var. lata. From the Red Crag, Sutton. 



c, distorted specimen, from the Mammaliferous Crag, Bramerton. 



/, cartilage plate of var. lata. 



