NT iS3) Gx 
Go 
TAB. XXIV. 
. Lutraria elliptica, p. 251. From Coralline Crag, Ramsholt. 
. Mactra truncata, p. 245. 
. Mactra subtruncata, p. 247. 
a, specimen from Sutton. 
6, specimen from Bramerton. 
. Mactra solida, p. 245. From Red Crag, Sutton. 
c, a triangular variety probably of this species. It much resembles M. striata, 
Smith, ‘Wern. Trans.,’ vol. viii, pl. 1, fig. 22, but it has the two sides more 
equal. 
. Mactra obtruncata, p. 248. From Red Crag, Sutton. 
. Mactra constricta, p. 249. Fs ne 
. Mactra deaurata, p. 249. 
. Mactra procrassa, p. 244. 
