Monograph of the Palaeontographical Society . 8. Streptorhynchus pelargonatus, ScUotheim. Testiferous specimen (large valve), twice the natural size. Dalton-le-Dale. 19. — — Another specimen, differing in form. Dalton-le-Dale. 20. — — Another variety. Dalton-le-Dale. 21. — — Lateral view (twice the natural size) of a cast. Dalton-le- Dale. 22. — — Cardinal view of the last, showing the area and deltidium. 23. — — 24. — — 25. — — 26. — — ] Cardinal view (twice the natural size) of other specimens : 27. — — J «3 the deltidium or closed fissure. Dalton-le-Dale. 28. — — Enlarged view of the poster
Monograph of the Palaeontographical Society . 8. Streptorhynchus pelargonatus, ScUotheim. Testiferous specimen (large valve), twice the natural size. Dalton-le-Dale. 19. — — Another specimen, differing in form. Dalton-le-Dale. 20. — — Another variety. Dalton-le-Dale. 21. — — Lateral view (twice the natural size) of a cast. Dalton-le- Dale. 22. — — Cardinal view of the last, showing the area and deltidium. 23. — — 24. — — 25. — — 26. — — ] Cardinal view (twice the natural size) of other specimens : 27. — — J «3 the deltidium or closed fissure. Dalton-le-Dale. 28. — — Enlarged view of the posterior half of the shell, showing the dental plates {a) and socket-plates {b). TunstallHill. 29. Productus horridus, /. de C. Sowerhy. Front view (natural size) of the large valve of a testiferous specimen. Garmundsway. 30. — — Umbonal view of the last specimen. 31. — — Lateral view of the same. Testiferous specimens, twice the natural size, looking onthe small valve and area {a). C, B Ji., PLATE XL 1. Productus horridus, /. de C. Sow. Testiferous specimen, natural size. Whitley. 2. — — Testiferous specimen, natural size. Derbyshire. Mr. J. de C. Sowerbys specimen—the original of fig. 1 in platecccxix of the Mineral Conchology. 3. — — Large valve of another testiferous specimen from Derby- shire. Mr. J. de C. Sowerby. 4. — — View of a specimen partially deprived of the shell, natural size. Humbleton Hill. 5. — — Right half of a testiferous specimen, natural size, showing the cardinal spines of both valves. Humbleton Hill. 6. ?— — - Impression of the left half of the small valve, natural size, showing the pits of a single row of cardinal Hill. 7. — — Impression of the external surface of the small valves, showing abortive spmes. Humbleton Hill. 8. — — Large valve, a little enlarged, of a young (testiferous) specimen. Tynemouth Cliff. 9. — — Small valve of t
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectpaleontology, bookyea
