1. Modified from Schütt, Ornithoceras. 2. Diagram of transverse fission of a Dinoflagellate. 3. After Schutt, Exuviaeella. 4. After Stein, Prorocentrum.
5, 6. Ceratium, single and series. 7. Pouchetia fusus (Schutt). 8. Citharistes. 9. After Butschli, Polykrikos.
From Delage and Hérouard’s Traité de zoologie concrete, by permission of Schleicher Frères.
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{{Information |Description={{en|<table><tr><td>1. Modified from Schütt, ''Ornithoceras''.<br /> 2. Diagram of transverse fission of a Dinoflagellate. <br /> 3. After Schutt, ''Exuviaeella''.<br /> 4. After Stein, ''Prorocentrum''.</td> <td>5, 6. ''