PLATE XIX. 



LLANDEILO FLAGS. 



Figs. 1 — 4. Barrandia {Homalopteon) radians, M'Cot. In various stages of growth. 



1. „ „ „ Young, with only four thorax-rings 



developed. a, natural size ; b, 

 magnified. Wellfield, Builth. 



2. „ „ „ Somewhat older, wdth seven thorax- 



rings. Pencerrig, Builth. 



3. „ „ „ Not quite half grown, the eighth 



thorax-ring partly developed. 

 (All the above in the Mus. Pract. 

 Geology.) 



4. „ „ „ Full-grown tail. Gwernyfyd, Builth. 



(Mr. J. E. Lee's cabinet.) 

 Fig. 5. Barrandia {proper) Cordai, M'Coy. The only specimen known. 



Pencerrig, Builth. Once and a 

 half natural size. The true length 

 is represented by the line beside 

 it. 5 «. A thorax-ring, enlarged. 

 (Woodwardian Museum.) 

 Figs. 6 — 10. Barrandia {Homalopteon) Portlockii, Salter. 



6. „ „ „ Large specimen, partly restored. 



6 a. One of the thorax-rings ; 



B^ 



diagram. 



7. „ „ „ Young specimen. 



8. „ „ „ Full-grown caudal portion. 



9. „ „ „ Labrum, with one side and the tip 



broken off. 

 10. „ „ „ Head, showing glabella-fm-rows very 



perfectly. The free cheeks are 

 wanting in all our specimens. 



Figs. 3, 4, 6 — 10 are natural size; figs. 1, 2 magnified ; fig. 5 enlarged one half. 

 Figs. 6 — 10 are from the Mus. Pract. Geology. 



