PLATE XLV. 



SILURIAN SPECIES. 

 Fig, 



1. Strophomena exjjansa. Sow. Caradoc ; The Maen, near Meifod. Mus. Geol. 



Soc. 1 a. Shell-sculpture, enlarged. 



2. „ ,, Lambay Island. Mus. Pract. Geol. 



3. „ „ Longitudinal section of both valves. 



4,5. „ „ Caradoc; Harnage, south-east of Shrewsbury. 



6. ,, „ Interior of the ventral valve, showing the muscular and 



vascular impressions. Caradoc ; Moel-y-Garth. Taken 

 from Murchison's original specimen (an internal cast) 

 in the Mus. Geol. Soc. 



7. „ ,, Interior of ventral valve. Soudley, near Church Stretton. 



Taken from an internal cast. Mus. Pract. Geol. 



8. „ ,, A large internal cast of the ventral valve. Caradoc ; near 



Meifod. 



9. „ „ Slab covered with large internal casts, principally of the 



ventral valve. Bardahessiagh, Tyrone. Mus. Pract. Geol. 

 10. „ „ Interior of dorsal valve, taken from gutta-percha model of an 



internal cast. Caradoc beds ; near Llanfyllin. 



