370 MANUAL OF NATUKAL HISTOEY. 



8. FAMILY. Shelled -Astasians (Epipyxididse). 



Body with, a single aperture, changing the 

 form at will ; an external shell. 



II. SUB-ORDER. EPITKICHANS (Epitricha). 



Body ciliated, or furnished with setae, without 

 pseudopediform prolongations. 



9. FAMILY. Disk-Animalcules (Cyclidiidse). Body 



with ciliated appendages ; shell none. 

 10. FAMILY. Wreath-Animalcules (Peridiniidse). 

 Ciliae often in the form of a zone or crown ; 

 an external shell. 



III. SUfi-ORDER.PsEUDOPOVS (Pseudopoda). 



Body with variable pseudopediform prolongations. 



11. FAMILY. Protean -Animalcules (Amcebidae). 



Body without a shell ; furnished with vari- 

 able processes. 



12. FAMILY. Capsule-Animalcules (Arcellidse). 



Body with changeable appendages ; enclosed 

 in an urceolate or scutellate shell. 



II. ORDER ENTERODELOUS-INFUSORIALS (Enterodela). 



An internal digestive canal, provided with a 

 mouth, and an anal opening. 



I. SUB-ORDER. AffOPiSTHiAtfs (Anopisthia). 



Mouth and anus contiguous. 



1. FAMILY. Bell - Animalcules (Vorticellidae). 

 Without shell; developicg by imperfect 

 spontaneous division ; free and solitary, or 

 fixed and associated. 



