part 2] GEOLOGICAL HISTORY OF THE GENUS STRATIOTES. 137 



Fig. 28. Stratiotes neglectus, Bembridge Marls, Hamstead Ledge (Isle of 

 Wight). X 4. 



29. Stratiotes acuticostatus, Hamstead Beds, Bouldnor Cliff (Isle of 



Wight). X 4-5. (See p. 127.) 



30. Stratiotes acuticostatus, Hamstead Beds, Bouldnor Cliff (Isle of 



Wight). X 4. 



31. Stratiotes websteri, Hamstead Beds, Hamstead (Isle of Wight). X4. 



Plate VI. 

 [Figs. 1-20, interior of seeds ; 21-31, cell-structure.] 



Pig. 1. Stratiotes ivebsteri, Hamstead Beds, Hamstead (Isle of Wight). X4. 



2. Stratiotes ivebsteri, lignite, Bovey Tracey (imperfect ; shows raphe). 



X 4. (See p. 128.) 



3. Stratiotes websteri, lignite, Bovey Tracey (imperfect ; shows micro- 



pyle). X 4. 



4. Stratiotes websteri, Cyrena Marls, Offenbach-am-Main. X 4. 



5. Stratiotes ivebsteri, Cyrena Marls, Offenbach-am-Main. X 2. 



•6. Stratiotes thalictroides, Calcaire de- Beauce, Longjumeau (imperfect; 

 shows micropyle). X 4. (See p. 129.) 



7. Stratiotes thalictroides, Calcaire de Beauce, Longjumeau (restoration 



of interior). X 4. 



8. Stratiotes thalictroides, Calcaire de Beauce, Longjumeau (transverse 



section). 



9. Stratiotes kaltennordheimensis, Lower Miocene, Kaltennordheim. X4. 



10. Stratiotes kaltennordheimensis, Lower Miocene, Salzhausen. X 4. 



11. Stratiotes kaltennordheimensis, Lower Miocene, Mosbach, Wiesbaden. 



X 4-5. (See p. 130.) 



12. Stratiotes tuberculatus, Pont-de-Gail Lignite, Lower Pliocene (very 



oblique micropyle). X 5. (See p. 131.) 



13. Stratiotes tuberculatus, Pont-de-Gail Lignite, Lower Pliocene (re- 



flexed micropyle). X 4. 



14. Stratiotes tuberculatus, Pont-de-Gail Lignite, Lower Pliocene (hori- 



zontal micropyle). X 4. 



15. Stratiotes tuberculatus, Upper Miocene Lignite, Chambeuil (imper- 



fect ; shows micropyle). 



16. Stratiotes tuberculatus, Upper Miocene Lignite, Chambeuil (imper- 



fect ; shows raphe). 



17. Stratiotes intermedins, Preglacial, Eime, Hanover. X 3. (See p. 132.) 



18. Stratiotes aloides, Cromer Forest-Bed, Beeston. X 3 - 5. 



19. Stratiotes aloides, Pleistocene, St. Cross, South Elmham. X 3. 



20. Stratiotes aloides, recent. X 3 - 5. 



21. Stratiotes aloides, recent, cells of tegmen. Much magnified. 



22. Stratiotes aloides, recent, cells of innermost layer of testa. Much 



magnified. 

 [Figs. 23-31. Cells of the interior of the keel; the external edge is always to 

 the right, and the internal edge to the left, of the figures. All 

 much magnified.] 



23. Stratiotes headonensis, Lower Headon. 



24. Stratiotes neglectus, Bembridge Marls. 



25. Stratiotes acuticostatus, Hamstead Beds. 



26. Stratiotes websteri, Hamstead Beds. 



27. Stratiotes kaltennordheimensis, Lower Miocene. 



28. Stratiotes tuberculatus, Lower Pliocene. 



29. Stratiotes intermedins, Preglacial. 



30. Stratiotes aloides, Pleistocene (Klinge). 



31. Stratiotes aloides, recent. 



