SUPPLEMENT, PLATE VTIL 



Fig. 



1. Meristellfi ? angustifrons, M'Coy. A large example. Lower Llandovery. Mullock Hill, 



Girvan. Coll. of Mrs. R. Gray. (Sil. Mon., P. 111.) 



2, 3. Spirifera plicutella, var. radiata, Sow. 2. Upper Llandovery, Bargany Pond Burn. 3. Same 



formation. Penkill Bed.s, Penwhapple Glen, Girvan. 

 Coll. of Mrs. R. Gray. (P. 13/.) 

 4, 5. Cyrtia exporrecta, Wahl. 4. Upper Llandovery, Penkill, Girvan. Coll. of Mrs. R. Gray. 



5. From Caradoc or Horderley Sandstone, Chatwall, 

 Salop. ColL of Dr. C.Callaway. (P. 137.) 



6 — 9. Merista ? cyrnbula, Dav. 6, 7. Exterior of both valves. 8. Internal cast of ventral valve. 



8 a. Interior of valve taken in gutta percha from the 

 cast. y. Internal cast of same valve. 9 a. Interior 

 of valve. Upper Caradoc, Drummuck, Girvan. 



6. Hunterian Museum, Glasgow. 7, 8. Same loc. 

 9. Thraive, Girvan District, Ayrshire. 7, 8, 9. Coll. 

 of Mrs. R. Gray. (P. 138.) 



10, 1 \. Athyris? subundata, M'Coy. Upper portion of Upper Llandovery, Minsterley, Shropshire. 



12. Glassia obovata, 8o\f. BTp. Upper Llandovery, Penkill, Girvan. Coll. of Mrs. E. Gray. (P. 116.) 



13. Athyris ? sp. Llandeilo, Balcletchie. Coll. of Mrs. R. Gray. 



14. ,, ? „ Middle Caradoc, Whitehouse Bay, Girvan. Coll. of Mrs. R. Gray. 



15. 16. Eichwaldia Capewelli, Dav. 15. From Lower Wenlock shales, Buildwas. 15 a. From Upper 



Wenlock shales under Benthall Edge, Shropshire. 

 15 6. Specimen enlarged, seen from the beaks, to 

 illustrate the bare portion of the beak of the ventral 

 valve. IG. Portion of the interior of a Swedish 

 specimen, enlarged, after Lindstrom. (P. 140.) 



17 — 22. Triplesia insularis, Eichwald. 17. Complete specimen from the Caradoc. Ty-isaaf. Coll. of 



Dr. C. Callaway. 18. From the Upper Llandovery, 

 Minsterley, Shropshire. Collected by Mr. R. PhiHp. 

 19. Interior of a dorsal valve, enlarged. Caradoc. 

 Ty-isaaf. Coll. of Dr. C. Callaway. 20. Fragment of 

 the interior of a dorsal valve. 21, 22. Internal casts 

 (fragments) of the dorsal valves, Caradoc shales of 

 Cerrig Caedog, south-east of Moel Ferna, Corwen, 

 Merionethshire. (P. 143.) 



23. „ Wenlockiensis, Dav. Collected by Dr. C. Callaway from Wenlock shale ? Wenlock, 



Shropshire. My collection. (P. 144.) 



24- -29. „ .<* incerta, Dav. 24, 25, 26. Exterior. Upper Llandovery, Penkill, Ayrshire. 



27. Interior of dorsal valve. 28. Internal cast of 

 same valve. 29. Interior of ventral valve, from a 

 specimen excavated by Mr. J. Young, and in 

 Hunterian Museum, Glasgow. The other specimens 

 from the coll. of Mrs. R. Gray. (P. 145.) 



30. „ ? spir if er aides, M'Coy. Internal cast. Llandeilo, Girvan. Coll. of Mrs. R. Gray. 



(P. 146.) 



31. ,, ? monilifera, M'Coy. Middle Llandovery, Woodland Point, Girvan. Coll. of Mrs. 



R. Gray. (P. 147.) 



32. „ ? Grayce, Dav. Llandeilo, Craighead, Ayrshire. Coll. of Mrs. R. Gray. (P. 144.) 



33. RhynchoneUa Maceoyana, Dav. Caradoc, Glencotho Quarry, near Broughtou, Peebleshire. 



Coll. of the Geol. Survey of Scotland. (P. 161.) 



