PLATE XIV. 



Leptodesma, sp. (Page 12].; 

 Fig. 



1. Left valve, imperfect and probably somewhat distorted. Pilton. Barnstaple Athenseum. 



Leptodesma cttltellatum, n. sp. (Page 121.) 



2. Left valve, showing the fine striation, X 2. 2 a. Corresponding right valve from the same slab, 



doubtless belonging to the same specimen, showing the fine striation of the surface of the back, 

 and the wings, x 2. Braunton. Museum of Practical G-eology. 



3. Two valves in contact, lying obliquely in the matrix, and somewhat obscured, X 2. Pilton. 



Porter Collection. 



Leptodesma anatinum, n. sp. (Page 122.) 



4. Cast of a right valve, very imperfect, but showing the umbo, hinge-line, wings, and anterior 



muscle-scar, X 2. Pilton. Porter Collection. 



5. Left valve, injured above, but showing the wings and the character of the surface, x 2. Pilton. 



Porter Collection. 



6. Another imperfect left valve, in which the surface-ornament is obliterated, but the shape 



partially well shown. Pilton. Porter Collection. 



Leiopteria Conbadi, Hall ? (Page 124.) 



7. Specimen of the left valve, wanting surface, X f . Barnstaple. "Woodwardian Museum. 



Leioptebia mtjeata, n. sp. (Page 125.) 



8. Specimen of right valve, very defective, but showing the ornament and the general shape of 



part of the skull, X 2. Barnstaple. Woodwardian Museum. 



Ptxchoptebia damnoniensis, Sowerly, sp. (Page 12G.) 



9. Large specimen, retaining the surface, which shows that the fine radiations on the hind wing are 



sometimes partially obliterated, and having an angular, but somewhat injured front wing. 

 9 a. Portion of surface, X 10. West Angle Bay, Pembrokeshire. Museum of Practical Geology. 



10. Sowerby's original type, which is almost a cast. The marked convexity of the hind wing in the 



specimen is not shown in the figure. 10 a. Upper view. 10 h. Anterior view. Marwood. 

 Woodwardian Museum. 



11. Cast of a much less oblique and transverse variety. 11a. Upper view. 11 J. Anterior view, 



Marwood. Museum of Practical Geology. 



12. Specimen, retaining surface, but obscured by matrix in front, accurately agreeing in character 



with Phillips's figure of ^t7'ct«Za caHce^/ate, X 2. Kingdon's, Shirwell. Barnstaple Athenseum. 



13. A similar specimen which more nearly approaches fig. 11 in shape, and in which the minute 



concentric ornament predominates, X 2. Top Orchard. Barnstaple Athenseum. 



