TESTACEA 



241 



rows. Circular in cross-section. Aperture circular; oblique. 

 Cytoplasm grey, contains many granules and food particles. 

 A single nucleus; two contractile vacuoles. Pseudopodia long 

 straight or curved filopodia. Length 60 to 200 microns; diame- 

 ter 30 to 70 microns. 



Genus Campascus Leidy. Test retort-shaped with curved 

 neck, rounded triangular in cross-section. Aperture circular, 

 oblique, with a thin transparent discoid collar. 



Fig. 96 



a. Euglypha cristata. X250 (After Wailes). 



b. E. mucronata. X2S0 (After Wailes). 



c. PauUnella chromatophora. X750 (After Wailes). 



d. Cyphoderia ampulla. XI 50 (After Cash). 



e. Camptiscus corniitus. X 125 (After Leidy). 



f. Trinema enchelys. X250 (After Wailes). 



Campascus cornutus Leidy (Fig. 96, e). Test pale-yellow, 

 retort-shaped ; with a covering of small sand particles ; triangular 

 in cross-section. A single nucleus and a contractile vacuole. 

 Filopodia straight. Length 110 to 140 microns. In the ooze of 

 mountain lakes. 



Genus Trinema Dujardin. Test small, hyaline, ovoid, com- 

 pressed anteriorly, with circular silicious plates. Aperture 

 circular, oblique, invaginated. A single nucleus placed pos- 

 teriorly. Filopodia not branched. 



