DIFFLUGIA. 13 



urceolata. SYN. : D. urceo.ata, Carter, lageni- 

 formis, Wallich, proteifortnis, Wallich, amphora, Leidy, olla, 

 Leidy. 



Shell amphora-form, body spheroidal, ovate or ovoid, 

 fundus obtusely and evenly rounded, more or less acute 

 or acuminate, rarely bearing blunt spines (D. olla). Neck 

 short, contracted, mouth large, circular, terminal, with or 

 without a rim, usually reflected or everted. Shell com- 

 monly of hyaline quartz-sand. Sarcode, colorless ; pseu- 

 dopods many, digitate, simple and branching. Size : 

 spheroidal forms, ISO// to 440/* long by 140 p. to 380/^ 

 broad ; ovoid forms, 200// to 520// long by 140;* to 360/* 

 broad. 



Hob. Ditches and ponds, sphagnous swamps. 



Cratera. SYN. : D. cratera, Leidy. 



Shell goblet-shaped, with oval or spheroidal body and 

 wide, cylindroid neck ; fundus obtuse ; mouth terminal, 

 large, circular, truncating the neck, or with a reflected 

 rim ; composed of colorless, chitinoid membrane, with 

 particles of sand and dirt. [It is possible that these shells 

 pertain to the ciliated inf usorian of the genus Tintin- 

 nus.~\ Size : 56/* to 66/* long by 36// to 42// wide ; breadth 

 of neck, 28/u to 36/*. 



Hob. Among Ceratophyllum and aquatic plants. 



Diffiugid acuminata. SYN. : Dijflugia, Leclerc ; D. acumi- 

 nata, Ehr., Perty, bacillariarum, Perty, pyriformis, Carter, proteifortnis, 

 Wallich ; D. Corticella acuminata, Ehr. 



Shell amphora-form or oblong, oval pyriform or cylin- 

 droid, with the upper part inflated ; fundus acute, acu- 

 minate or prolonged into a nipple-shaped process, rarely 



