.56 



LLCTURE in. 



Trachelina. 



KOLPODINA. 



OXY 



TRICHINA. 



EUPLOTINA. 



Glaucoma, Spiiostomum, Trache- 

 litis, Loxodes, Chilodon, Phia- 

 li?ia, Bursaria, Nassula. 



Kolpoda, ParamcEcium, Amphi- 

 leptus. 



Oxytricha, Stylonychia, Uro- 

 styla. 



Euplotes, Himantophorus, Chla- 

 midodo7i. 



Order EHIZOPODA. 

 Shell, calcareous, camerated. 

 Locomotion, by branched, retractile processes. 



Tribe Monosomatia. 

 Genus Amceba. 



Genera Arcella, Difflugia, Gromia, 

 Euglypha, Trinema. 



Family Amcebina. 

 Family Arcellina. 



Miliola, 



Form 

 jointed. 



Tribe Polysomatia. 

 Genera Vorticialis, Geoponus, Nonionina. 



Class ROTIFERA. (Wheel-animalcules). 

 Body oblong, with a tail or post-abdomen more or less 

 Shell, when present, gelatinous. 

 Locomotion, by peculiar aggregates of vibratile cilia on the head. 

 Digestion, by an alimentary sac or canal, in an abdominal cavity. 

 Circulation, by a pulsatile sac, vessels, and sinuses. 

 Respiration, by an aquigerous apparatus with peculiar vibratile 

 organs. 



Generation, oviparous or ovoviviparous. Sexes distinct. 

 Family Monotrocha. (Single-wheeled). Qte\^ev2i Ptygura, Ichthy- 



dium, ChcBtonotus, (Ecistes, Conochilus. 

 (Notch -wheeled). Genera Megalotrocha, 

 Tuhicolaria, Stephanoceros, Lacinularia, 

 Melicerta, Floscularia. 

 (Many-wheeled). Genera Enteroplea, Hyda- 

 tino, Noiommata, Polyarthra, Triarthra, 

 Euchla7iis, Scdpina. 

 (Double-wheeled). Genera Rotifer, Acti- 

 7iurus, Noteus, Philodina, Anurma, 

 Brachionus.* 



Family Schizotroch. 



Family Polytrocha. 



Family Zygotrocha. 



* In this summary adopted, with slight modiiication, from Siebold (XXIV.), 

 only those families and genera are cited which best serAe as types of the organisation 

 of the rc:?pective groups. 



