PLATE XVI. 



AvicuLOPECTEN TRANSVEESUS, Sowerhj, sp. (Page 127.) 



1. Specimen of an imperfect left valve, retaining ornament, X ^. la. Portion of surface, X 10. 



Barnstaple. Woodvvardian Museum. 



2. Right valve, figured by Phillips, vertically compressed, but showing wings. Brushford. Museum 



of Practical Geology. 



3. Portion of right valve, showing the ornament and the anterior wing. Pilton. Porter Collection. 



4. Eight valve, nearly perfect, but vertically compressed, showing the wings. Barnstaple Wood- 



wardian Museum. 



AvicuLOPECTEN nexilis, Sowerhi/, sp. (Page 129.) 



5. Very imperfect specimen of the left valve, x 3. Top Orchard. Barnstaple Athenaeum. 



6. More perfect, but rather doubtful left valve, defective at the wings, x 2. Braunton. Barnstaple 



Atlienseum. 



Pletjeonectites Piltonensis, n. sp. (Page 140.) 



7. Nearly perfect right valve, showing the smooth surface, striated wing, and produced anterior 



margin, x 2. Piltou. Porter Collection. 



8. Mould of a very large right valve, showing the posterior wing. Pilton. Porter Collection. 



9. Right valve, which is much less oblique, a difference which is probably due to distortion, but if not 



would be, according to de Koninck, of specific value, X f. Top Orchard. Barnstaple 

 Athenaeum. 



10. Left valve of a specimen, perhaps of the same species, but, if so, much distorted, x f. Bradiford. 



Barnstaple Athenaeum. 



11. Very similar but shorter left valve, x f. Raleigh. Barnstaple Athenaeum. 



Pleueonecxites lepis, n. sp. (Page 142.) 



12. Specimen of an imperfect right valve, X 2. Pilton. Porter Collection. 

 18. Specimen of the left valve, x 2. Top Orchard. Barnstaple Athenaeum. 



Pletteonectites Hicksii, n. sp. (Page 142.) 



14. Specimen of the left valve X f. BradiCord. Barnstaple Athenaeum. 



Chenipecten? aueitus, u. sp. (Page 139.) 



15. A very imperfect left valve, X 2. Bradiford. Barnstaple Athenaeum. 



16. Right valve, imperfect below, but showing the ornament and the wings, X 3. Top Orchard. 



Barnstaple Athenaeum. 



