"Various forms of Dinoflagellata. 1. Glenodinium 2. Ceratium 3. Prorocentrum 4. Polykrikos. 2 shows the shell only; 4a is an undischarged, and b a discharged stinging-capsule; chr, chromatophores; fl. 1, longitudinal flagellum; fl. 2, transverse flagellum; l. gr, longitudinal groove; ntc, nematocyst; nu, meganucleus; nu, micronucleus; pg, pigment spot; t. gr, transverse groove." -Parker, 1900

Dinoflagellates

"Various forms of Dinoflagellata. 1. Glenodinium 2. Ceratium 3. Prorocentrum 4. Polykrikos. 2 shows…