AMOEBOID PROTOZOA (SARCODINA) 



229 



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



Campascus Leidy. 



Representative species Campascus cornutus Leidy 1877. 



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 brown 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 /j. 

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

 (Atter Leidy.) 



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



Cyphoderia Schlumberger . . in 



111 (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 61 to 195 ii. 

 Several varieties of this species are known. 

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

 (After Leidy.) 



112 (in) Fundus tapering. Cyphoderia ampulla va.r. papillataWsLHes 1911. 



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 

 135 »". 

 Fig. 328. Cyphoderia ampulla vi.T. Papillala. X150. (From a prepared mount.) 



113 (108) Shell straiglit. 



114 



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

 etc. . . . Pseudodifflugia Schlumberger. 



Representative species. 

 . Pseudodifflugia gracilis Schlumberger 1845. 



""^^IT-^mI!^ -i'^^^-x. Shell ovoid, elongate, usually yellowish or brownish. Pseudo- 



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

 "^S^^^^^^^^^ ponds, lakes, etc. Length 20 to 65 11. 



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



115(114) Shell with distinct plates 116 



116 (119) Shell not compressed, with a short flattened neck. Plates round or 

 oval Sphenoderia Schlumberger . , 117 



117 (118) Margin of neck dentate. 



Sphenoderia dentata Penard 1890. 



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

 the presence of the teeth. The plates overlap, giving the appearance of a 

 hexagonal design. Found among sphagnum. Length 35 to 50 (i. 



Fig. 330. Sphenoderia dentata. X 330. (After Penard.) 



