214 



PROTOZOOLOGY 



Family 1 Cryptomonadidae Stein 



Genus Cryptomonas Ehrenberg. Body elliptical with a firm pel- 

 licle; anterior end truncate; dorsal side convex, ventral side slightly 

 so or flat; nucleus posterior; longitudinal furrow; tubular cavity 

 extending to the middle of body, through which equally long flagella 

 arise; 2 lateral chromatophores vary in color from green to blue- 

 green, brown or rarely red; holophytic; with small starch-like bodies 





Fig. 95. a, Cryptomonas ovata, X800 (Pascher); b, Chilomonas Para- 

 mecium, X1330 (Biitschli); c, d, ChrysideUa schaiidinni, X1330 (Winter); 

 e, Cyathomonas truncata, X670 (Ulehla); f, Cryptochrysis commutata, 

 X 670 (Pascher); g, Rhodomonas lens, X1330 (Ruttner); h, Nephroselmis 

 olvacea, X670 (Pascher); i, Protochrysis phaeophycearum, X800 (Pascher); 

 j, k, Phaeothamnion confer vicoluvi, X600 (Kiihn). 



which stain blue in iodine; 1-3 contractile vacuoles anterior; fresh 

 water. Several species. 



C. ovata E. (Fig. 95, a). 20-30/x long; among vegetation. 



Genus Chilomonas Ehrenberg. Similar to Cryptomonas in general 

 body form and structure, but colorless because of the absence of 

 chromatophores; without pyrenoid; cytopharynx deep, lower half 

 marked by "rudimentary trichocysts" ; 1-2 contractile vacuoles, 

 anterior; nucleus in posterior half; endoplasm often filled with poly- 

 gonal starch grains ; fresh water. 



C. Paramecium E. (Fig. 95, h). Posterior end narrowed, slightly 

 bent "dorsally"; 20-40^^ long; saprozoic; widely distributed in stag- 

 nant water and hay infusion. 



