CRYPTOMONADINA 215 



C. ohlonga Pascher. Oblong; posterior end broadly rounded; 20- 

 50/1 long. 



Genus Chrysidella Pascher. Somewhat similar to Cryptomonas, 

 but much smaller; yellow chromatophores much shorter; those oc- 

 curring in Foraminifera or Radiolaria as symbionts are known as 

 Zooxanthellae. Several species. 



C. schaudinni (Winter) (Fig. 95, c, d). Body less than 10/x long; in 

 the f oraminiferan Peneroplis pertusus. 



Genus Cyathomonas Fromentel. Body small, somewhat oval; 

 without chromatophores; much flattened; anterior end obliquely 

 truncate; with 2 equal or subequal anterior flagella; colorless; nu- 

 cleus central; anabolic products, stained red or reddish violet by 

 iodine; contractile vacuole usually anterior; a row of refractile 

 granules, protrichocysts (p. 65), close and parallel to anterior margin 

 of body; asexual reproduction by longitudinal fission; holozoic; in 

 stagnant water and infusion. One species. 



C. truncata Ehrenberg (Fig. 95, e). 15-30iu long. 



Genus Cryptochrysis Pascher. Furrow indistinctly granulated; 

 2 or more chromatophores brownish, olive-green, or dark green, 

 rarely red; pyrenoid central; 2 equal flagella; some lose flagella and 

 may assume amoeboid form; fresh water. 



C. commutata P. (Fig. 95, /). Bean-shaped; 2 chromatophores; 

 19m by 10m. 



Genus Rhodomonas Karsten. Furrow granulated; chromatophore 

 one, red (upon degeneration the coloring matter becomes dissolved 

 in water) ; pyrenoid central ; fresh water. 



R. lens Pascher and Ruttner (Fig. 95, g). Spindle-form; about 16m 

 long; in fresh water. 



Family 2 Nephroselmidae Pascher 



Body reniform; with lateral equatorial furrow; 2 flagella arising 

 from furrow, one directed anteriorly and the other posteriorly. 



Genus Nephroselmis Stein. Reniform; flattened; furrow and 

 c3^topharynx distinct; no stigma; 1-2 chromatophores, discoid, 

 brownish green; nucleus dorsal; a central pyrenoid; 2 contractile 

 vacuoles; with reddish globules; fresh water. 



N. olvacea S. (Fig. 95, h). 20-25m by 15m. 



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; p3^renoid central; 2 contrac- 

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

 fresh water. 



