MICROSCOPIC FORMS IN FRESH WATER. 7 



Peniuni interuptiim, large form. Staurastrumptinctulatum. 



" lamellosum. " cornutuni. 



" crassa. " (minus) muticuin. 



" closterioides. " hirsutuni. 



" naviculuin. " aculeatuni. 



" truncatuni. " echinatum. 



•' oblongum. Xantliidium ColumlDianiim. 



Spirotcenia condenaata. " fasiculat \nr Hexag. 



" obscura. " " var subalpin. 



DIATOMS. 



Baccilis paradoxa. Naviciila viridis. 

 Cymbella gastroides. " Boeckii. 



Diatom vulgare. " " dactylus. 



" tenue. " " var subgigas., 



Fragillaria ('aimcina. " tabellaria. 



" entomen. " aspera. 



Gomphonema dichotomum. Pleuroaigma delicatuhim. 



" acuminatum. Stauroneus Baileyii. 



Himantidium pectinale. " pteroidea. 



Meridion circulare. •' phoenecenteron. 



Navicula cuspidata. SurirellH splendida. 

 radiosa. 



INFUSORIA. 



Vorticella, Astasiaea, Euglenia (different species), Chilomonas, 

 Epistylis, Stylonycbia, Carchesium Cliilodon, Loxodes, Stentor 

 igneus, Cothurnia. , 



ROTIFKRS. 



Rotifer vulgare Megalotrocha, Pterodina patina, Amoeba villosa. 



RHIZOPODS. 



Clatbrulina elegans. Difflugia pyraformis. 



Centropyxis aculeata. " corona. 



Trinema enchelys. " globosa. 



VARIOUS FORMS. 



Chironomus larvae. Hydra viridis, Nais worms, Anguillulte, 

 Canthocamptus, Hydradephegae, Cyclops, Chaetonotus acantho- 

 des, Pristina worms, Dendrocoelum lacteum, Alonopsis, Cyprids, 

 Chaetonotus loricus and larus, Oligochaetae, Camptocercus] 

 Cliydorus, Tubellaria worms. 



PNEUMOBRANCHIATA. 



Limnea culumella. 

 Physa heterostropha. 

 Planorbis defiectus. 



