AMOEBOID PROTOZOA (SARCODINA) 



229 



109 (no) Plates small, round, more or less covered by foreign particles. 



Campascus Leidy. 

 Representative species Campascus cor nut us Leidy i^-j-j. 



This species has lateral processes developed from the fundus. 

 In common with other species of the genus, a delicate, transpar- 

 ent collar surrounds the aperture, extending perpendicular to it. 

 In common with the genus Cyphoderia, the bodies of all species 

 of this genus enclose minute yellow or l^rown granules very re- 

 sistant to reagents. Apparently a very rare species. Leidy re- 

 ports it from but one locality, China Lake, Wyoming, at an 

 altitude of 10,000 feet. Length 112 to 140 /i. 

 Fig 326. Campascus cornutus. cv, contractile vacuole. x 150. 

 (After Leidy.) 



no (109) Plates small, regular, not covered by foreign particles. 



Cyphoderia Schlumberger . . in 



III (112) Fundus rounded or mamillate. 



Cyphoderia ampulla Ehrenberg 1840. 



Plates round or oval, cemented together in diagonal rows, 

 presenting a hexagonal appearance. The plates do not over- 

 lap. Minute perforations exist between the plates, appearing 

 as fine punctae. Pseudopodia few but very long. Found 

 among mosses, ooze of ponds and lakes. Length Oi to 195 ti. 

 Several varieties of fnis species are known. 

 Fig 327. Cyphoderia ampulla. cv, contractile vacuole. X 160. 

 (After Leidy.) 



112(111) Fundus tapering. . Cyphoderia ampidla V3iT. papillata Wsiiles iQii. 



This variety resembles the type species except in the shape of the 

 ^-^''^"'^-^ fundus. The plates are sometimes set very close together in this 



" ■ \ variety but do not overlap. Found in ooze of lakes. Length 113 to 



CT. -3 135 M. 



Fig. 328. Cyphoderia ampulla var. Papillata. X150. (From a prepared mount.) 



113(108) Shell Straight "4 



114 (115) Shell without distinct plates, chitinous, covered with sand, dirt. 



etc Pseudodifflugia Schlumberger. 



Representative species. 



Pseudodifflugia gracilis Schlumberger 1S45. 



Shell ovoid, elongate, usually yellowish or brownish. Pseudo- 

 podia numerous, very long and delicate. Found in the ooze of 

 ponds, lakes, etc. Length 20 to 65 m- 



Fig. 329. Pseudodifflugia gracilis, n, nucleus. X 250. (After Leidy.) 



115 (n4) Shell with distinct plates 116 



n6 (n9) SheU not compressed, with a short tlattcncd neck. Plates round or 

 oval 5/>//e;/('(/('r/(2 Schlumberger n; 



117 (n8) Margin of neck dentate. . . . Sphcnodcria dcntata \\\r.\Xi.\ x'^oo. 



This species may be known by the elongate-oval form of the shell and 

 the presence of the teeth. The plates overlap givnig the appearance of a 

 hexagonal design. Found among sphagnum. Length 35 to 50 m- 



Fig. 330. Sphenoderia dcnlata. X jio. (After Pcnard.) 



