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EXPLANATION OF THE PLATES.
PLATE I.
| Fig. 01. | Surirella Venus, weakly magnified. Natural length of the cuirass: 0,002565. Breadth: 0,000104 of an inch (Paris). |
| Fig.„ 02. | Seen from above, more magnified. |
| Fig.„ 03. | Open animalcule. |
| Fig.„ 04. | Another, equally open; a. the cuirass; b. its inge; c. the white and transparent coat; d. incision, in the internal membrane; e. the brown or green content. |
| Fig.„ 04. | A. Ribs and furrows B. on the edge of the cuirass. |
| Fig.„ 05. | Navicula ciliata, two united animalcules. Length of the cuirass: 0,00044. |
| Fig.„ 06. | Separated animalcule, sidewise seen. |
| Fig.„ 07. | The same, seen from backwards; a. cuirass with angles and hairs; b. edge of the pedal surface; c. extremities of the sides; d. d. orifices of the alimentary tubes. |
| Fig.„ 08. | The same animalcule, seen from the pedal surface; e. d. d. orifices of the two alimentary tubes seen sidewise. |
| Fig.„ 09. | Navicula costata, seen sidewise; length: 0,00226. |
| Fig.„ 10. | The same, seen from downwards; a. cuirass; b. the brown content; b¹ b¹, pedal bladders; f. f. intestinal tubes, and their orifices; d. ombilic of the middle ribs. |
| Fig.„ 11. | Two united animalcules. |
| Fig.„ 12. | Frustulia appendiculata; two united animalcules. Length: 0,00139; breadth: 0,00055. |
