34 CYPHODEKIA. 



GENUS III. CYPHODERIA. 



SYN. : Dijftugia, Assulina, Ampullaria, Hologlypha, Ehr. ; Cypho- 

 deria, Schlum. ; Euglypha, Perty ; Lagynis, Schulze. 



Shell retort-shaped, mouth downward, long axis in- 

 clined ; chitinoid, transparent, colored or colorless, com- 

 posed of minute, hexagonal elements of uniform size, 

 arranged in alternating series in parallel, spiral rows. 

 Mouth minutely beaded. Sarcode pale, granular, usually 

 nearly filling the shell. Nucleus large, clear, usually 

 homogeneous. Contractile vesicles present. Pseudo- 

 pods numerous, forking, mostly radiating in a horizontal 

 plane. 



Cyphoderia ampulla. SYN. : Difflugia ampulla, lagena, 

 Seelandica, adunca, alabamensis, uncinata, hologlypha, D. Assulina 

 adunca, D. A. alabamensis, D. A. ampulla, D. A. margaritacea, D. A, 

 uncinata, Ehr. ; Cyphoderia margaritacea, Schlum., Stein, Fresenius, 

 Carter, H. and L., Leidy, Schulze ; Euglypha curuata, Perty ; Lagynis 

 baltica, Schulze ; Euglypha margaritacea, Difflugia margaritacea, Eugly- 

 pha baltica, Wallich ; Cyphoderia ampulla, Leidy. 



Shell retort-shaped, neck short, cylindrical, curving 

 downward and truncated by a circular mouth ; body 

 oblong oval, longitudinal axis inclined but nearly hori- 

 zontal ; fundus obtusely rounded, sometimes flattened, 

 frequently prolonged into a nipple at the summit ; color 

 yellowish or colorless. Length, from 112/i to 176// ; 

 breadth, from 40/j. to 80// ; mouth, 16// to 28//. 



Hob. Ooze of ponds, lakes and ditches. 



GENUS IV. CAMPASCUS. 



Shell shaped like Cyphoderia, but fundus provided 

 with a pair of divergent, chitinoid processes. 



