DINOFLAGELLIDA 



99 



Family 1 Peridiniidae Bergh 



The shell is composed of numerous plates. The annulus is 

 usually at the equator and covered by a plate known as the 

 cingulum. The plates which are variously sculptured and finely 

 perforated vary in shape and number among different species. 



Fig. 34 a, b. Exuviaella marina. X250 (After Schiitt). 



c. Prorocentrum micans. X250 (After Schiitt). 



d. Peridinium tabulatm. X500 (After Stein). 



e. P. diver gens. X500 (After Calicins). 



f. Ceratium hirundinella. X400 (After Stein). 



g. Goniodoma acuminatum. X325 (After Stein), 

 h. Dinophysis acuta. X430 (After Schutt). 



i. Oxyphysis oxytoxoides. X580 (After Kofoid). 

 j. Phytodinium simplex. X250 (After Klebs). 

 k. Stylodinium globosum. X225 (After Doflein). 



