PLATE XV. 



Pterinopecten poltteichus, Phillips, sp. (Page 132.) 

 Fig. 



1. Very large but imperfect left valve, showing the radiations and some trace of transverse ornament. 



Croyde Bay. Museum of Practical Geology. 



Pterinopecten Hallii, n. sp. (Page 134). 



2. Very perfect left valve, set very slightly obliquely in the matrix, and slightly defective on the 



anterior wing, X 3. 2 a. Portion of the surface, X 5. Pilton. Porter Collection. 



3. Left valve, with a large and undefined hind wing, defective in front, X f . Meer Top. Barnstaple 



AthenaBum. 



4. Left valve of a large shell, showing the front wing, but defective below, x |. Petherwyu. 



Museum of Practical G-eology. 



5. Left valve, wanting the wings, x |. Top Orchard. Barnstaple Athenaeum. 



G. Left valve, wanting the wings, but showing the posterior side without rays and with stronger con- 

 centric threads, x 3. Top Orchard, Barnstaple Athenaeum. 



Ceenipecten ? AtTRiTTJs, n. sp. ? (Page 139.) 



7. Doubtful and indistinct left valve, with small wings and very numerous rays, which do not seem to 



. alternate, but of which every third or fourth seems rather stronger than the rest. The surface 

 is removed except round the edges, x 2. Smoking House Lane. Porter Collection. 



Pterinopecten scabriradians, n. sp. (Page 135.) 



8. Doubtful left valve, imperfect in front, and somewhat obscured by vertical crushing and ex- 



foliation of surface, but showing the fine, sharp, and nearly equal distinct ribs and faint signs 

 of transverse threads, X 3. Pilton. Porter Collection. 



9. Defective right valve, showing the interrupted radiations and the deeply-notched anterior wing, 



X 3. Pilton. Porter Collection. 



Pterinopecten Austeni, F. A. Homer, sp. (Page 136.) 



10. Very large left valve, showing the wings, tlie spiny margin, and the peculiar ornament. 10 a. 



Portion of surface, X 3. Pilton. Porter Collection. 



11. Left valve, drawn from a gutta-percha cast, and showing the foliaceous growtii-lines, X 2. 



Barnstaple. "Woodwardian Museum. 



Pteeinopecten mundus, n. sp. (Page 137.) 



12. Left valve, showing the hinge-area and front wing. 12 a. Portion of surface, X 3. Barnstaple. 



Woodwardian Museum. 



13. Large but very much distorted specimen. 13 a. Lateral view. Barnstaple. AVoodwardian 



Museum. 



AcTiNOPTEETA RUDis, PJiUHps, sp. (Page 131.) 



li. Left valve, defective below, and showing a smooth posterior wing, the smoothness of which 

 appears caused by the obliteration of the surface, X 2. Barnstaple. Woodwardian 

 Museum. 



