48 



K X P L A N A T I O N OK PLATES. 



PLATE III. 



FIG. 1. Biforine, from Pistia stratiotes, discharging 



its raphides. 



2- Conochilus volvox, Ehr., without the case. 

 Enterprise. 



3. Aporea ambigua, B. See p. 42. 



4, 5. Peridinium carolinianum, B. Graham- 



ville, S. Ca. 



6, 7. Philodina pannosa, B. No. 6, by the ca- 

 mera ; No. 7, by the eye. 



8, 10. Melicerta nuda, B. See p. 41. Enter- 

 prise. 



11. Cothurnia raaritima, Ehr. Tampa. 



12. Notommata longiseta, Ehr. Enterprise. 



13. Portion of arm of Stephanoceros Eichhornii ? 



from Enterprise ; showing lateral, not ver- 

 ticillate cilia. In other respects the Ameri- 

 can specimens agree with Ehrenberg's 

 figures. 



FIG. 9, 14. Rotifer \estitu*, B. Enterprise. See 

 p. 41, fig. 9, extended, and drawn by the 

 eye; fig. 14, contracted, and drawn by 

 the camera lucida. 



15. Cothurnia maritima ? Ehr. Tampa. 



1(3. Acineta Lyngbyii ? Ehr. St. Augustine. 



17. Brachionus urceolaris, Ehr. St. Augustine. 



18. Cothurnia havniensis, Ehr. Tampa. 



19. Pterodina magna, B. Anastasia Island, Fa. 



This is drawn to the scale of fig. 25. 



20. 21. Brachionus polyacanthus, Ehr. Enter- 



prise, Fa. 



22. Acineta mystacina. Pilatka. 



23. Cotlxurnia imberbis, Ehr. Pilatka. 



24. Scale A, for figs. 1, 3, 4, 5, 11, 12, 17, and 



21, being y/g-jths of an inch, magnified 

 equally with these figures. 



25. Scale B, for figs. 2,6, 7, 8, 9, 10, 14, 15, 



1C, 19, and 23, being ninths of an inch, 

 magnified equally with the drawings. 



