TEE CORALLIAN ROCKS OF ENGLAND. 403 



EXPLANATION OF PLATES XII.-XVII. 



Plate XII. 

 Table of Compilative Sections of the Coralline Rooks of England. 



Plate XIII. 



Fig. 1. Ammonites pseudocordat us, Bl. & H., Westbury ironstone, two fifths 

 nat. size. 

 2,2 a. Ammonites cawtonensis, Bl. & H., Coral Rag of Sike Gate, Caw- 

 ton, Yorkshire, nat. size. 



3. Chemnitzia langtonensis, Bl. & H., Coral Rag of Langton Wold, 

 Yorkshire, nat. size. 



4. Chemnitzia pseudolimbata, Bl. & H, Abbotsbury ironstone, nat. 

 size. 



5. Chemnitzia f err uginea, Bl. & H., Abbotsbury ironstone, nat. size. 

 In the collection of J. F. Walker, Esq. 



5 a. Chemnitzia f err uginea, Bl. & H., Abbotsbury ironstone, nat. size. 

 In the Woodwardian Museum, Cambridge. 



Plate XIV. 



Fig. 1. Fragment of the Coral Rag of Ayton, showing, a. Cerithium inor- 

 natum, Buv. ; h. Eucyclus Buvignieri, D'Orb. ; c. Littorina muricata, 

 Sow. ; d. Trochus aytonensis, sp. n., nat. size. 

 1 d. Trochus aytonensis, Bl. & H., Coral Rag, Ayton, enlarged. 



2. Cerithium virdunense, Buv., Small-shell bed, Cauklass End, Ness, 

 Yorkshire, nat. size. 



3. Nerincea fusiformis, D'Orb.; 3a. Fragment showing the mouth: 

 Coral Rag, Brompton, Yorkshire: nat. size. 



4. Natica marchamensis, Bl. & EL, Marcham, near Oxford, nat. size. 



5. Natica felina, Bl. & H., Lower Calcareous Grit, Catcombe, Wilt- 

 shire, nat. size. 



6. Operculum of a Neritopsis, Coral Rag, Upware, nat. size. 



7. Tancredia disputata, Bl. & H., Osmington Oolite, nat. size. 



8. Lucina aspera, Buv., Upper Calcareous Grit, Yorkshire, nat. size. 



9. 9 a. Lucina oculus, Bl. & H., Coralline Oolite, Yorkshire, nat. size. 



10. 10 «. Astarte subdepressa, Bl. & H., Coral Rag, Wiltshire, nat. 

 size. 



11. Astarte aytonensis, Lycett, Ayton, Yorkshire, nat. size. 



12. Protocardium isocardioidcs, Bl. & PL, Trigonia-beds, Osmington, 

 nat. size. 



13. Avicula ovalis, Phill., var. obliqua, Upper Calcareous Grit, Pick- 

 ering, enlarged. 



Plate XV. 



Fig. 1, 1 a. Cyprina tancrediformis, Bl. & H., Nothe Grits, Weymouth, 

 nat. size. 



2. Cypricardia glabra, Bl. & H., Trigonia-beds, Osmington; 2a. the 

 interior of another valve, Trigonia-beds, Pickering : both nat. size. 



3. Astarte Duboisiana, D'Orb., Coralline Oolite, Seamer, nat. size. 



4. 4 a. Pecten qualicosta, Etall., right and left valves, Osmington 

 Oolite, nat. size. 



5, 5 a. Gastrochana carinata, Bl. & H., North Dorset limestone, 

 enlarged. 



6. Area lanthanon, Bl. & H., Coral Rag, Slingsby, Yorkshire, nat. 

 size. 



7. Area anomala, Bl. & H., Coral Rag, Upware, nat. size. 



8. 8a. Mytilus varians, Rom., Coralline of North Dorset, nat. size. 



9. Pecten intertextus, Rom., Coralline Oolite, Settrington, nat. size. 



10. Glyphea f err uginea, Bl. & H., Abbotsbury ironstone; carapace, 

 nat. size. 



2d2 



