254 



THE AMERICAN MONTHLY 



[Aug. 



Mollusca 



Paludina vivipera 



Limnoeus stagualis 



Belanus 



Unio crassus 



Planorbis cornea 



Planorbis 



Paludina 



Paludina 



Helix hortensis 

 *Mussel 

 *Luuibricus terrestes (earthworm) 



Lumbrichus variegatus 



(I <( 



*Lumbricus limosus 

 * " tenuis 



A marine worm or annelid — 



Psyrmobrancbus protensus 



*Marine worms 



Various opercularia 

 Conchophthirus anodontae 

 Epistylis coarctatae 

 Podophrya elongata 

 Epistylis plicatilis 

 Epistylis balanorum 

 Conchophthirus 

 Epistylis euchlorum 

 Scyphidia limacina 

 Phychostomum 

 Anoplophrya vermicularia 

 Conchophthirus 

 Anoplophrya mytie 

 Plagiotoma lumbrici 

 Anoplophrja striata 

 Hoplitophrya lumbricua 



'* falcifera 



Hoplitophrya secans 



" securiformis 



Anoplophrya clavata 



" cochleariformis 



Lichnophora cohnii 

 Anoplophrya prolifera 

 Balantidium medusarum 

 Trichodina digitodiscua 

 Urceolaria mitra 

 Colvoluta schulzie 

 Pulsatella convoluta 

 Hoplitophrya recurva 

 Hoptophrya planiarium 

 "- " uncinata 



Planarian-thysanozoou tuberculata Lichnophora auerbachii 



Planarians 



*Planarian limacina 

 * " torva 



Triton cristata 



U I' 



* " toeniatus 

 *Bufo pantherinus 

 *Hyla europea 

 *Frogs & toads 



*Nais serpentina 

 *Nais littoralis 



Spirochona tintinabulum 

 Trichodina pediculus 

 Balantidium elongatum 

 Haptophrya gigantea 

 Opalina obtrigona 

 Opalina ranarum 

 Opalina dimidiata 

 Opalina iutestinalis 

 Balantidium eutozoon 

 " elongatum 



" duodeui 



Nictotherus cordiformis 

 Anoplophrya naidos 



" nodulata 



