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PLATE XXVI. 



LOWER SILURIAN (LLANDEILO AND CARADOC). 



Fig. 1 a, h. lllanus {III) Murchisoni, Salter. Front and side views of a very fine 



specimen in Mr. J. E. Lee's collection ; from 

 Grug Quarry^ Bird's Hill,Llandeilo; in Caradoc 

 or Bala limestone. P. 201. 

 1 c, 1 d. „ „ Direct and front views of the head, same 



specimen . 



Fig. 2. Illanus {Panderia) Lewisii, Salter. Nat. size and magnified. Moelydd, 



Oswestry, in Caradoc rocks. (Cabinet of 

 Rev. D. Phillips Lewis, of Guilsfield.) P. 183. 



Figs. 3, 4. Illcenus {III.) Portlockii, Salter. Caradoc schists of Desertcreat, Co. 



Tyrone. (Portlock's originals, Museum P. 

 Geology.) P. 197. 



F'igs. 5 — 8. Illanus {Eclillanus) perovalis, MvEcmsoji. Llandeilo rocks of Shrop- 

 shire and South Wales, P. 211. 

 5,6. „ „ Specimens figured in the ' Silurian System.' (Mu- 



seum of the Geol. Society.) From near Shelve. 



7. „ „ „ More fully grown specimen, without the head, 



which is restored in outline from fig. 8. 

 Llanrian, near Abereiddy Bay, Pembrokeshire. 

 (Mus. P. Geol.) 



8. „ „ „ Nearly perfect specimen, with head. We were 



compelled only to outline the head, as the 

 plate was already finished ere this specimen 

 was found.) At a the place of the eye is 

 indicated. (Cabinets of Mr. Lightbody and 

 Dr. H. Hicks.) 



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