PLATE 4 

 Fig. 35. Gymnodinimn dissimUe sp. nov. Colored by 0. Swezj'. Ventral view. X 1102. 



Fig. 36. Amphidinium vasculum sp. nov. Colored by 0. Swezy. Ventral view. Note the 

 differentiated ectoplasm, food bodies and radial rodlets. Nucleus is spheroidal body in posterior 

 part. Compare with Gymnodinium dogieli (pi. 3, fig. 34). X 626. 



Fig. 37. Gymnodimum mulfistriatum sp. nov. Colored by 0. Swezy. Ventral view. 

 Nucleus lies at the left of the posterior junction of girdle and sulcus. Cytoplasm densely filled 

 with vacuoles. X 626. 



Pig. 38. Gyrodinium pingue {Sclmtt) . Ventral view. Food bodies present. Note character 

 of surface striae. X 1102. 



Fig. 39. Gyrodinium flavesccns sp. nov. Colored by 0. Swezy. Sinistroventral view. 

 Greatly elongated nucleus is in predivision stage. Food bodies present. X 1102. 



Fig. 40. Gymnodinium lunula Schiitt. Encysted stage prior to formation of zooids. 

 X 1102. 



Fig. 41. Gymnodinium canus sp. nov. Ventral view. Nucleus lies between girdle and 

 posterior flagellar pore. Fatty globules aud other products of metabolism present. X 626. 



Fig. 42. Gymnodinium sphacricum sp. nov. Ventral view. Body somewhat distorted. 

 Predivision stage of nucleus. Cytoplasm filled with rodlets and other products of metabolism. 

 X 1102. 



Fig. 43. Gyrodinium spiralc (Bergh). Food bodies present. Nucleus anterior. Posterior 

 pusule greatly enlarged. X 626. 



Fig. 44. Gymnodinium lurbaccum Kofoid. Original drawing by C. A. Kofoid; colored by 

 0. Swezy. Note food vacuoles filling the cytoplasm with chromatophores also present. X 881. 



Fig. 45. CocModinium clongatum sp. nov. Colored by 0. Swezy. Encysted stage with 

 nucleus recently divided. X 626. 



Fig. 46. Gyrodinium hiconicum sp. nov. Dextroventral view. Food bodies present. Pre- 

 division stage of nucleus. X 1102. 



Fig. 47. Polykrikos kofoidi Chatton. Ventral view. Food bodies present. Note the four- 

 zooid condition of the cytojjlasm with only two nuclei present. Nematocy.sts conspicuous. X 639. 



Fig. 48. Gyrodinium viridescens sp. nov. ^"entral view. Nucleus near center of body. 

 X 1102. 



Fig. 49. Torodimum robustum sp. nov. Colored by 0. Swezy. Viewed from left side. 

 Elongate pusule. X 1102. 



[546] 



