INDEX TO THE PLATES. 



The small numbers exhibit the greatest diameter of each object, in fractional 

 parts of an inch. It was not found practical to represent them all on one scale. 



OBJECTS FROM THE LEVANT MUD. 

 FIGUUE. 



1. Deuticellatridentata— Ehr. 



2. Biddulphia pulchella. 



3. Amphitetras autidiluviana var. ? 



4. 6, 8. Grammatophora Africana — Ehr. 



5. var. ? 



Y, 9. . tseniseformis. 



10. ? One of the Diatomacese. — Genus undetermined. 



11. Striatella arcuata var. I have recently received this 



variety from Rhodes' Island, U.S. through Dr. Bailey. 



12. Fragillaria. 



13. 14. Gomphonema — two species. 

 15 to 20. Naviculae. 



21. This is called a Navicula in the text. I believe it to 



be a Synhedra. The central dot should be removed 

 from the drawing, and the extremities made more 

 square. 



22. Surirella. 



