PLATE XXL 



LLANDEILO FLAGS. 



The large and fine specimen of Asaphus tyrannus figured in the ' Silurian System/ 

 pi. xxiv, as a variety, ornatus. 



[We have, as usual in these plates, restored missing portions in a light tint. No 

 inconvenience can arise from this practice so long as care is taken to distinguish accu- 

 rately between the real and the missing parts. Li the present instance one rib too many 

 is added to the tail, which never shows more than twelve side-ribs.] 



This is not the largest specimen known. A, tyrannus grows very nearly a foot in 

 length. 



