PLATE XXII. 



LLANDEILO FLAGS. 



Figs. 1 — 4. Asaphus peltastes, Salter. 



1. „ „ Fine young specimen, showing the lateral lobes of 



glabella and long head-spines. (Mus. Pract. 

 Geology.) Llandeilo. 



2. ,, „ Free cheek and eye. The smooth cornea is re- 



moved, and shows the minute lenses, 4000 or 

 more in a single eye. (Mus. Pract. Geology.) 



3. „ „ Head of young specimen. Llampeter Felfrey. 



(Mus. Pract. Geology.) It is a little shortened 

 by pressure. 



4. „ „ Tail of nearly full-grown specimen. Llandeilo. 

 Figs. 5 — 12. Asaphus tyrannus, Murchison. Old and young. Llandeilo. 



5. „ ,, Head of very perfect specimen. (In the cabinet 



of Mrs. Breawell, of Brighton.) 



6. „ „ Labrum from Llampeter Felfrey. (Mus. Pract. 



Geology.) 



7. „ „ Magnified eye-lenses. 



8. „ „ End of large thorax-ring. (Mus. Pract. Geology.) 



9. „ „ Fine caudal shield. (Brit. Mus.) The nodes on 



the sides of the axis are the internal glands 

 mentioned in p. 52. 

 10, 11, 12. „ „ Young caudal shields. The ribs are shorter and 



more numerous than in corresponding specimens 

 of A. peltastes. (Mus. Pract. Geology.) 



