Third Part, 1866.—”New Infusoria in a Sea Aquarium,” by Dr. Ferdinand Cohn, of Breslau.—After some interesting remarks of a general character on the structure of Infusoria, Dr. Cohn proceeds to describe at some length the. following species of Infusoria observed by him:—1. Trachelocerca Phœnicopterus, n. sp. 2. Lacrymaria Lagenula, Clap, and Lachm. Meta- cystis truncata, nov. gen. et spec. Nassula microstoma, n. sp. Placus striatus, nov. gen. et spec. Amphileptus Gutta, n. sp. Lembus velifer, nov. gen. et spec. Anophrys sarcophaga, nov. gen. et spec. Colpoda pigérrima, n. sp. Uronema marinum, Duj. Pleuronema Citrullus, n. sp. Helicastoma oblongum, nov. gen. et spec. Loxophyllum rostratum, n. sp. Actinotric ha saltans, nov. gen. et spec. Stichocfueta pediculiformis, n. sp. Oxytricha scutellum, n. sp. Oxytricha flava, n. sp. ; var. carnea. Oxytricha rubra,...

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