56 GENERAL ORGANIZATION OF THE PROTOZOA 



Family 1. Ht/pocomidw. 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, 1884. 



Family 2. Urmdidw. 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. 



Typical genera: Rhyncheta, Zenker, 1S66; Urnula, Clap, and Lach., 1858. 



Family 3. Metannclida:. 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, Metacincta, Biitschli, 1888. 



Family 4. Podophryidcp. 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. 



Typical genera: Spherophrya, Clap, and Lach., 1858; Endospha?ra, Engelmann, 

 1876; Podophrya, Ehr., 1838; Ephelota, Str. Wright, 1858; Podocyathus, 

 Kent, 1881. 



Family 5. Acinetida;. 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. 



Typical genera: Tokophrya, Biitschli, 1SS8; Acineta, Ehr., 1833; Solenophrya, 

 Clap, and Lach., 1858; Suctorella, Frenzel, 1891. 



Family 6. Dcndrosomidw. 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. 



Typical genera: Trichophrya, Clap, and Lach., 1858; Dendrosoma, Ehr., 1838; 

 Staurophrya, Zacharias, 1893. 



Family 7. Dendrocometidw. 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 peri- 

 trichous. 



Typical genera: Dendrocometes, Stein, 1867; Stylocometes, Stein, 1867. 



Family 8. Ophryodcndridcc. 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. 



Typical genera: Ophryodendron, Clap, and Lach., 1858. 



PROTOZOA WITHOUT MOTILE ORGANS, AND CLASSIFICATION 



OF THE SPOROZOA. 



To state that the sporozoa are without motile organs is not strictly 

 accurate, for many of them have well-developed myonemes (gregarines) 

 and move with a vermiform motion. Others have, at times, the power 

 of progressing by means of pseudopodia (many of the neosporidia). 

 Nor is the method of reproduction (spore formation) any less equi- 

 vocal, for many forms reproduce by simple division as well as by spore 

 formation (schizogregarinida). This division, therefore, mo^e than 



