EXPLANATION OF PLATE XXXII. 
Limoptera ? permo-carbonifera , Eth. fil. 
Left valve with indistinct radii. 
Right valve with ligamental pit under the left umbo and nodes 
representing muscular pits in the umbonal cavity of the 
right valve. 
Stutchburia farleyensis, Eth. fil. 
Internal cast of a right valve. 
Hinge line of conjoined valves., internal cast. 
Internal cast of anterior end of conjoined valves. 
The same of another example. 
