EXPLANATION OF PLATES 



All figures are made with the aid of a camera lueida from living material by the authors and 

 colored by Miss Anna Hamilton, unless otherwise stated. 



PLATE 1 



Fig. 1. Amphidinium asymmetricum sp. uov. Camera drawing by iliss Inez Smith. Ven- 

 tral view. Note the single large, ramifying chromatophore obscuring the centrally located 

 nucleus. X 1323. 



Fig. 2. Gymnodinium lineatum sp. nov. Ventral view. The surface striae show the un- 

 usual obliquity characteristic of the species. Note the branching pusule and the aggregated 

 pigment at the antapex. X 626. 



Fig. 3. Gyrodinium truncatum sp. nov. Three food bodies are present. Encystment is 

 apparently a quiet period aiding digestion. X 1102. 



Fig. 4. Amphidinitim galhanum sp. nov. Ventral view. The surface is lightly furrowed 

 and immediately beneath it are the green, leaflike chromatophores. The nucleus is posteriorly 

 located. X U02. 



Fig. 5. Gymnodinium aurcum sp. nov. Dextroventral view. Note the striae of broken 

 lines and two small, colored spherules, probably food remnants. X 600. 



Fig. 6. Amphidinium cucurhitella sp. nov. Dextroventral view. Surface deeply furrowed. 

 Two large food masses present, one recently ingested, surrounded by a Avater vacuole which has 

 disappeared in the second food body. X 626. 



Fig. 7. Gymnodinium scopulosum sp. nov. Sinistroventral view. An encysted individual 

 with cytoplasm unusually free from the products of metabolism. The size of the cyst indicates 

 an advanced stage of encystment. X 1102. 



Fig. 8. Cochlodinium schuetti sp. nov. Sinistroventral view. Note the single large food 

 body, the minute oil droplets in periphery, and the two pusules merged into one. X 1102. 



Fig. 9. Amphidinium cucurhita sp. nov. Ventral view. Compare the complex cytoplasmic 

 structure with the siinpler condition in Amphidinium galhanum (fig. 4). The nucleus is the 

 reniform body dorsad to the posterior pusule. Surface deeply striate. X 626. 



Fig. 10. Gymnodinium ravenescens sp. nov. Ventral view. Two food bodies present with 

 chromatophores. Note the similarity of chromatophores with those of Amphidinium corpulentum 

 (fig. 11). X1102. 



Fig. 11. Amphidinium corpulentum sp. nov. Ventral view. Note the presence here also 

 of food bodies or the products of metabolism and chromatophores, indicating both holozoic and 

 holophytic nutrition. The nucleus is the long, ellipsoidal body on the right side. X 1323. 



Fig. 12. Gymnodinium situla sp. nov. Ventral view. Note the colored food bodies, vacuoles 

 and spherules, products of metabolism. Nucleus is posteriorly located. X 1102. 



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