Organisms constituting the food of mussels. X 1,000. Diatomaceae (modified from Wolle). 
1. Biddulphia rhombus (Ehrenberg) W. Smith. 
2. Amphora proteus Gregory. 
3. Tabellaria fenestrata Kiitzing. 
4. Surirella ovalis var. ovata Brebisson. 
5. Rhabdonema adriaticum Kiitzing. 
6. Navicula didyma Ehrenberg. 
7. Navicula lauceolata Kiitzing. 
8. Navicula lyra Ehrenberg. 
9. Rhabdonema arcuatum Kiitzing. 
10. Navicula splendida var. puella Ad. Schmitz. 
11. Biddulphia favus (Ehrenberg) H. V. H. 
12. Actinoptychus undulatus Ehrenberg. 
