INFUSORIA 



67 



Fig. 123 EpistyUs flavfcans 

 (Conn). 



Fig. 124 



Cothurnia crys- 



tallina 

 (Calkins). 



8. OPERCULARIA Ehrenberg. Like Pyxidium, but colonial; whole 

 colony rigid: 8 species; in fresh water. 



0. articulata Ehr. Body spindle- 

 shaped, truncate at lower end, and .05 mm. 

 long: on water beetles. 



9. COTHURNIA Ehren- 

 berg. Body elongate and 

 enclosed in a colorless or 

 brownish cup, at the bot- 

 tom of which it is at- 

 tached and into which it 

 can retract; cup also at- 

 tached either directly or 

 by a short stalk: numer- 

 ous species; in fresh and 

 salt water. 



C. crystallina Ehr. (Fig. 124). Length of cup .07 to .2 mm.: in 

 fresh and salt water; Woods Hole. 



SUBCLASS 2. SUCTOEIA. 



Usually sessile Infusoria which have no cilia as adults but are pro- 

 vided with long hollow tentacles adapted for sucking or piercing; they 

 attach the tentacles to other Infusoria and suck them out; some are 

 entoparasites in Infusoria: 8 families with about 200 species. 



Key to the families of Suctoria here described: 



G! Body globular, without a cup 1. PODOPHRYIDAE 



2 Body not globular. 



&! Body usually in a cup at end of a slender stalk 2. ACINETIDAE 



& 2 Body without cup or stalk ; tentacles knobbed 3. DENDBOSOMIDAE 



FAMILY 1. PODOPHRYIDAE. 



Body globular and not in a cup ; stalked or 

 not, and with tentacles of different kinds, some 

 knobbed and some acute: 5 genera. 



1. SPHJEROPHRYA Claparede and Lachmann. 

 Body spherical or ovoid and without stalk, with 

 knobbed tentacles radiating from all sides: free- 

 living in swamps and infusions or entoparasites 

 in Stentor, Paramecium, and other ciliates; 4 

 species. 



S. magna Maupas (Fig. 125). Diameter .06 mm.: among water 

 plants. 



Fig. 



phrya magna 

 (Conn). 



