2IO THE PROTOZOA 



Family i. Hypocomidae. These are unattached forms of Suctoria with a perma- 

 nently ciliated ventral surface, and with one suctorial tentacle. Reproduction is 

 effected by cross-division. A single genus, Hypocoma Gruber ('84). 



Family 2. Urnulidae. A family of small attached forms, with or without a cup or 

 theca ; with one or two, rarely more, simple tentacles. Swarm-spores holo- 

 trichous. Genera: Rhyncheta Zenker ('66) ; Urnula Clap. & Lach. ('58). 



Family 3. Metacinetidae. Thecate forms ; the base of the cup is drawn out into a 

 long stalk, and the walls are perforated for the exit of the tentacles. A single 

 genus, Melacineta Biitschli ('88). 



Family 4. Podophryidae. Stalked or unstalked forms of more or less globular 

 shape. The tentacles are numerous and distributed about the entire surface or 

 limited to the apical region ; some of them are knobbed, others pointed and 

 have a prehensile function. Genera: Sphcerophrya Clap. & Lach. ('58); 

 Endosphcera Engelmann ('76) ; Podophrya Ehr. ('38) ; Ephelota Str. Wright 

 ('58) ; Podocyathus Kent ('81). 



Family 5. Acinetidae. The individuals are naked and stalked, or thecate and 

 stalked or unstalked. The tentacles are numerous, usually knobbed and all 

 alike. Reproduction is effected by inner or endogenous budding, which may be 

 simple or multiple. The swarm-spores are usually peritrichous, but may be 

 holotrichous or hypotrichous. Genera: Tokophrya Biitschli ('88); Acineta 

 Ehr. ('33) ; Solenophrya Clap. & Lach. ('58) ; Suctorella Frenzel ('91). 



Family 6. Dendrosomidae. Suctoria without stalks or theca. The tentacles are 

 numerous, all alike, and knobbed and grouped in distinct tufts ; they may be 

 simple or branched. Reproduction by endogenous division ; the swarm-spores are 

 peritrichous. Genera: Trichophrya Clap. & Lach. ('58); Dendrosoma Ehr. 

 ('38) ; Staurophrya Zacharias ('93). 



Family 7. Dendrocometidae. Sessile Suctoria resting upon the entire basal surface 

 or upon a portion of it raised as a stalk. The numerous tentacles are short and 

 knobbed, and distributed over the entire apical surface or localized upon 

 branched arms. Spore-formation is endogenous ; the swarm-spores peritrichous. 

 Genera : Dendrocometes Stein ('67) ; Stylocometes Stein ('67). 



Family 8. Ophryodendridae. Stalked or sessile forms possessing numerous long, 

 rarely knobbed tentacles, which are supported upon proboscis-like processes of 

 the apical side. Reproduction is brought about by endogenous budding. The 

 swarm-spores are peritrichous. Genera: Ophryodendron Clap. & Lach. ('58). 



SPECIAL BIBLIOGRAPHY VI 



Biitschli, 0. Protozoa, Infusoria. In Bronn's Klassen und Ordnungen des Thier- 



reichs. Leipzig, 1886-88. 

 Entz, G. Protistenstudien. Budapesth, 1888. 

 Kent, W. Saville. A Manual of the Infusoria. London, 1881. 

 Schewiakoff, W. Beitrage zur Kenntniss der Holotrichen Ciliaten. Bibliotheca 



Zoologica, Heft 5, 1889. 

 Stein, Fr. Der Organismus der Infusionsthiere. Leipzig, 1863 and 1867. 



