BRACHIOPODA. 



Fi<r. 5. 



79 



Lingula anatina, removed from shell, mantle reflected, coiled arms separated 

 slightly ; a, mouth. (Marginal setae omitted.) Ventral aspect, three-quarter 

 face. 



Fig. 6. 



V D 



Lingula anatina. Interior of valves showing muscle scars. 

 v. Peduncle valve. D. Brachial valve. 



