CRYPTOMONADINA 275 



Genus Protochrysis Pascher. Reniform; not flattened; with a dis- 

 tinct furrow, but without cytopharynx; a stigma at base of flagella; 

 1-2 chromatophores, brownish yellow; pyrenoid central; 2 contrac- 

 tile vacuoles ; fission seems to take place during the resting stage ; 

 fresh water. 



P. phaeophycearum P. (Fig. Ill, i). 15-17/z by 7-9//. 



Suborder 2 Phaeocapsina Pascher 



Palmella stage predominant; perhaps border-line forms between 

 brown algae and cryptomonads. Example: Phaeothamnion confer- 

 vicolum Lagerheim (Fig. Ill, j, k) which is less than 10// long. 



References 



Dragesco, J.: (1951) Sur la structure des trichocystes du flagelle 



cryptomonadine, Chilomonas paramecium. Bull. micr. appl., 2 



ser. 1:172. 

 Fritsch, F. E. : (1935) The structure and reproduction of the algae. 



Cambridge. 

 Hollande, A.: (1942) Etude cytologique et biologique de quelques 



flagell^s libres. Arch. zool. exper. g£n., 83:1. 

 (1952) Classe des Cryptomonadines. In: Grasse (1952), p. 



286. 

 Mast, S. O. and Doyle, W. L.: (1935) A new type of cytoplasmic 



structure in the flagellate Chilomonas paramecium. Arch.Protist., 



85:145. 

 and Pace, D. M. : (1933) Synthesis from inorganic compound 



of starch, fats, proteins and protoplasm in the colorless animal, 



Chilomonas paramecium. Protoplasma, 20:326. 



(1939) The effect of calcium and magnesium on 



metabolic processes in Chilomonas. J. Cell. Comp. Physiol., 14: 

 261. 



(1946) The nature of the growth-substance produced 



by Chilomonas paramecium. Physiol. Zool., 19:223. 



Pace, D. M.: (1941) The effects of sodium and potassium on meta- 

 bolic processes in Chilomonas paramecium. J. Cell. Comp. 

 Physiol., 18:243. 



(1944) The relation between concentration of growth-pro- 

 moting substance and its effect on growth in Chilomonas para- 

 mecium. Physiol. Zool., 17:278. 



(1947) The effects of vitamins and growth-promoting sub- 

 stance on growth in Chilomonas paramecium. Exper. Med. Surg. 

 5:140. 



Pascher, A.: (1913) Cryptomonadinae. Susswasserflora Deutsch- 

 lands. 2. 



West, G. S. and Fritsch, F. E.: (1927) A treatise on the British 

 freshwater algae. Cambridge. 



