ECOLOGY, COMMENSALISM AND PARASITISM 



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and die in the presence of oxygen. Amongst the animal flagellates, 

 Lauterborn (1916) includes as sapropelic forms: Mastigamoeba 

 trichophora, Lauterborn; Trepomonas agilis, Dnj.; Hexamitus infla- 

 tus, Duj. (also reported from sewage); Rhynchomonas nasuta, Stokes; 

 Pteridomonas pulex, Penard; Physomonas socialis, Kent; Heteronema 

 acus, Ehr.; //. spirale, Klebs, and Menoidium pelluddum, Perty. 

 Of rhizopod types he enumerates Pelomyxa palustris and Pamphagus 

 armatus as characteristic forms, while amongst the ciliates he finds 

 several types which are found nowhere else (Dactylochlamys pisci- 

 formis, Discomorpha pectinata, Legendrea bellerophon, Coenomorpha 

 medusula, Saprodinium dentatum and Pelodinium reniforme). 



With these sapropelic forms should be added the anaerobic organ- 

 isms which live in sewage; a list of such forms found in Imhof tanks 

 by Lackey (1925) includes the following animal flagellates: 



Common Forms. 

 Mastigophora: 

 Bodo caudatus 1 

 Bodo mutabilis 

 Bodo ovatus 

 Cercomonas crassicauda 1 

 Cercomonas longicauda 

 Cercomonas ovatus 

 Clautriavia parva 

 Dinomonas vorax 

 Hexamitus inflatus 2 

 Mastigamoeba longifilum 

 Mastigamoeba reptans 

 Mastigella simplex 

 Monas amoebina 

 Monas minima 

 Notosolenus orbicularis 

 Oicomonas socialis 

 Pleuromonas jaculans 

 Tetramitus decissus 

 Trepomonas agilis 2 



Rhizopods: 



Euglypha alveolata 

 Hartmannella hyalina 1 

 Dimastigamoeba gruberi 1 

 Vahlkampfia guttula 

 Vahlkampfia Umax 



Infusoria: 



Holophrya sp. 

 Metopus sigmoides 

 Saprodinium putrinum 

 Trimyema compressa 



Rare Forms. 



Anthophysa vegetans 

 Bodo angustus 

 Distigma proteus 

 Entosiphon sulcatus 1 

 Heteronema sp. 

 Menoidium incurvum 

 Peranema trichophorum 

 Petalomonas carinata 

 Petalomonas mediocanellata 1 

 Platytheca micropora 

 Salpingoeca Marssonii 



Amoeba proteus 

 Chlamydophrys stercorea 

 Trinema lineare 1 

 Vahlkampfia albida 



Aspidisca costata 

 Colpoda inflata Chilodon sp. 

 Cinetochilum margaritaceum 

 Cy^lidium glaucoma 

 Glaucoma scintillans 



5. The Coprozoic Protozoa.— Coprozoic Protozoa are forms which 

 pass through the digestive tracts of animals while encysted. Mixed 

 with water, dung containing such cysts forms a nutrient medium 



1 Also reported as soil-dwelling. 



2 Also reported in sapropelic fauna. 



