EXPLANATION OF PLATE III. 



Odontopleuea ovata, Emmrich. 



Fig, 1. Copy of the figure given by Burmeister, Organization der Trilo- 

 biten, pi. 2, fig. 11. 



AciDASPis BucHi, Barrande. 

 (Selenopeltis Stephani, Cor da.) 

 Fig. 2. An entire individual; after Barrande, op.ciU, pi. 37, fig. 25, 



