370 MANUAL OF NATURAL HISTORY. 



8. Family. — Shelled- Astasians (Epipyxididae). 



Body with a single aperture, changing the 

 form at will ; an external shell. 



II. SUB-ORDER.— Epiteichans (Epitricha). 



Body ciliated, or furnished with setae, without 

 pseudopediform prolongations. 



9. Family. — Disk-Animalcules (Cyclidiid^). Body 



with ciliated appendages ; shell none. 



10. Family. — Wreath-Animalcules (Peridiniidae). 



Ciliae often in the form of a zone or crown ; 

 an external shell. 



III. SUB-ORDER.— Pseudopods (Pseudopoda). 



Body with variable pseudopediform prolongations. 



11. Family. — Protean -Animalcules (Amoebidae). 



Body without a shell ; furnished with vari- 

 able processes. 



12. Family. — Capsule-Animalcules (Arcellidae). 



Body with changeable appendages ; enclosed 

 in an urceolate or scutellate shell. 



II. OEDEE. — Enterodelous-Infusorials (Enterodela). 



An internal digestive canal, provided with a 

 mouth, and an anal opening. 



I. SUB-ORDER. — Anopisthians (Anopisthia). 



Mouth and anus contiguous. 

 1. Family. — Bell - Animalcules (Vorticellidas). 

 Without shell ; developing by imperfect 

 spontaneous division ; free and solitary, or 

 fixed and associated. 



