PLATE III. 



DEVONIAN SPECIES. 



Fig. 



1. Athyris ? — Atrypa oblonga, Sow., 'Trans. Geol. Soc.,' 2nd series, vol. v, tab. xxxvi, fig. 6, 



Upper Devonian?, Barnstaple. Mus. Geol. Soc. Stated by Professor M'Coy 

 to be a crushed internal cast of Athyris concentrica. 

 2 — 8. Merista plebeia, Sow. sp. = Sp. scalprum, Roemer. Fig. 2, from Sowerby's type, Mount Wise, 



near Plymouth. Mus. Geol. Soc. Fig. 4 from north side of Stone 

 House Hill, near Plymouth. Plymouth Inst. Mus. Figs. 3, 5, 6, 

 7 from near Newton Abbot and Torquay ; fig. 5 shows the peculiar 

 fissure produced by a portion of the matrix having dropped out where 

 the "shoe-lifter-shaped process" existed. 

 9, 10. „ „ = Atrypa lacryma, Sow., 'Geol. Trans.,' 2nd series, vol. v, tab. xxxvi, 



fig. 9. These drawings are made from Sowerby's original specimens, 

 in the Mus. Geol. Soc, from the Middle Devonian Limestone of 

 Stone House Hill, near Plymouth. 

 11, 12. Athyris concentrica, var. Fig. 11, Upper Devonian, East Petherwin, Cornwall. Fig. 12, from 



Hope's Nose, near Torquay. Collection of Mr. Pengelly. 

 13, 14. ,, ,, Von Buch. Typical shape, from the shale at Mudstone Bay, South of Berry 



Head, Devonshire. Collection of Mr. Pengelly. 



15. „ „ Internal cast, showing the muscular impressions, from the Upper Devonian, 



Pilton Beds, Orchard Quarry, 1 mile north of Barum, North Devon. 

 Collection of Mr. J. M. Hall. 



16. ,, 1 „ =■ Atrypa indentata, Sow., ' Geol. Trans.,' 2nd series, vol. v, pi. liv, fig. 6. 



Petherwin, Cornwall. After the original figure. 



17. ,, 1 „ = Atrypa decussata, Sow., 'Trans. Geol. Soc.,' 2nd series, vol. v, pi. liv, 



fig. 5. Petherwin. After the original figure. 



18. „ ? ,, Perhaps the same as A, decussata, near Newton Abbot. Collection of Mr. 



Vicary. 



19. Athyris phalcena, Phillips. The original specimens from shale at Hope's Nose, near Torquay. 



Mus. Geol. Survey. 



20. ,, „ = A. hirundo, Phillips, From the original example, Hope's Nose, near 



Torquay. Mus. Geol. Survey. 



22. Athyris Newtoniensis, Dav. Middle Devonian, Woolborough Quarry, near Newton Abbot. 



Collection of Mr. Champernowne. 



23. „ Bartoniensis, Dav. Barton, near Torquay. Collection of Mr. Lee. 



24. „ concentrica? — A. hispida, Sow., 'Trans. Geol. Soc.,' vol. v, 2nd series, pi. liv, fig. 4, 



Petherwin, Cornwall. 



