AMOEBOID PROTOZOA (SARCODINA) 



221 



28 (27) Hemispherical to cup-shaped, densely coated with organic particles. 



Diplochlamys timida Penard 1909. 



Yellowish-gray or brown. Inner membrane very delicate, flexible 

 but resistant. Nucleus single. Vacuoles numerous. Pseudopodia 

 large at the base, pointed, rarely extended. Diameter 45 n. Habitat 

 mosses. Reported from Ontario by Dr. Penard. 



FIG. 284. Diplochlamys timida. X 275. (After Penard ) 



29 (26) Shell membrane single. ' ...;.*... 30 



30 (31) Hemispherical; slightly or not at all flexible. . . Parmulina Penard. 



Representative species Parmulina cyathus Penard 1902. 



In this species the shell is rigid but in P. obtecta Gruber it is flexible 

 about the aperture. Shell is coated with fine particles of sand, dirt, etc. 

 Pseudopodia are broad, rounded lobes extending from the aperture. 

 Nucleus and contractile vacuole each single. Habitat among mosses. 

 Diameter 45 ft. 



FIG, 285. Parmulina cyathus. X 275. (After Penard.) 



31 (30) Commonly ovoid or hemispherical, but very changeable. 



Corycia Dujardin. 

 Representative species. . . . ... . . Corycia flava Greeff 1866. 



The membranous covering is dome-shaped but very changeable in 

 form. Pseudopodia very short and thick. Vacuoles numerous. 

 Nucleus single, usually concealed by the granules of the endoplasm. 

 Habitat among mosses. Diameter 80 to 100 p.. 



FIG. 286. Corycia flava. X 210. (After Penard.) 



32 (25) Membrane without foreign particles; regularly punctate. ... 33 



33 (34) Patelliform; slightly flexible. ....... Microchlamys Cockerell. 



Representative species. 



Microchlamys patella Claparede and Lachmann 1860. 



Shell circular from dorsal or ventral view; convex above with a 

 very large aperture beneath. Pseudopodium single. Contractile 

 vacuoles numerous. Nucleus single. Habitat among mosses in 

 swamps. Diameter 40 /*. 



FIG. 287. Microchlamys patella. X 310. (After Penard.) 



34 (33) Commonly dome-shaped, but exceedingly flexible and changeable. 



Cochlio podium Hertwig and Lesser. 

 Representative species. . Cochliopodium bilimbosum Auerbach 1856. 



The membranous covering is capable of great expansion, especially at 

 the aperture. Pseudopodia pointed, usually numerous. Nucleus and 

 contractile vacuole each single and large. Common among algae. 

 Diameter of envelop 25 to 50 /u. 



FIG. 288. Cochliopodium bilimbosum. n, nucleus. X 300. (After Leidy.) 



35(24) Shell membranous, rigid. . 36 



36(45) Shell discoidal 37 



37 (44) Shell with regular markings more or less distinct. No foreign par- 



ticles attached. Aperture central 38 



38 (43) Shell with regular, distinct punctae. Aperture small. 



Arcella Ehrenberg . . 39 



39 (42) Periphery of shell without projecting points 40 



