Three species of the amphipod family Orchestiidæ were investigated for ectocommensals. These forms are Talorchestia longicornis (Say), Orchestia agilis Smith, and Orchestia palustris Smith. The material was collected in the vicinity of Woods Hole, Massachusetts.2. The stomatous, holotrichous ciliates that live as ectocommensals on the amphipods studied belong to two genera: Allosphœrium gen nov., of which there are five species, and Chilodonella Strand, of which there are three new species.3. All species of ciliates are well adapted to their environment, being small and flat and possessing ventrally placed thigmotactic cilia.4. The binary fission of one species (Allosphœrium convexa gen. nov., sp. nov.) is described. A ball of chomatin is differentiated in the macronucleus and extruded into the cytoplasm just prior to cell fission. Most of the macronuclear chromatin takes the form of long chromosome-like bodies during division, duplicating to a fair degree the condition found in Myxophyllum.
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Kidder et al. (1935) studied this question.