. Bulletin - United States National Museum. Science. THE OPALINID CILIATE IXFUSORIAXS. 185 Measurenients: A, of a large individual; B, of a small individual; C, of a plicate form— Measurements. mm. .085 mm. 0. 0865 .05 Leugtli of body Wid"th of body Thickness of body: ' .013 .008 Middle .014 .013 Posterior .0125 .016 Diameter of nucleus 0. 004- . 0048 0076 Cilia Line interval: Anterior .00187 .00118 Posterior .0033 .00275 .076 0. 005- . 0062. Fig. 154.—Opalina obtrigoxoidea, Raxa palustris, showing some individuals of the form plicata, x 117 diameter
. Bulletin - United States National Museum. Science. THE OPALINID CILIATE IXFUSORIAXS. 185 Measurenients: A, of a large individual; B, of a small individual; C, of a plicate form— Measurements. mm. .085 mm. 0. 0865 .05 Leugtli of body Wid"th of body Thickness of body: ' .013 .008 Middle .014 .013 Posterior .0125 .016 Diameter of nucleus 0. 004- . 0048 0076 Cilia Line interval: Anterior .00187 .00118 Posterior .0033 .00275 .076 0. 005- . 0062. Fig. 154.—Opalina obtrigoxoidea, Raxa palustris, showing some individuals of the form plicata, x 117 diameters. OPAUNA OBTRIGONOIDEA, form PLICATA, new forma. T7/pe.—United States National Museum Cat, No. 16562. Hosts.—Ba)ia palustris LeConte, type infection. Woods Hole, Massachusetts, July 17, 1919; M. M. Metcalf, collector; also Bufo fou'leri Putnam, from the same locality, summer 1919: M, M. Metcalf, collector; and another infection in this same host from Mount Monadnock. XeAv Hampshire, August, 1912, M. J. Rathbun. In some infections of Opa- lina ohtHgonoidea we find many individuals which are throAvn into longitudinal folds or ridges giving a quite distinctive appearance. A simihir longitudinal plica- tion is common in some other American Opalinas. I have not ob- served it in Opalina ohfrigona in Europe. OPALINA, species (?). A specimen has been deposited with the United States National Museum as No. 16556. Host.—Rana septentrionalis Baird, one scant infection, from United States National Museum specimen No. 13622, 45 mm. long, from Lucknow, Ontario, 1883; J. H. Garnier, collector. Measurements of a large hidivldAial.—Length of body mm.; width of body mm.; diameter of nucleus mm. to mm. These forms resemble 0. ohtrigonoidea from Rana jnpiens., but are too poorly preserved for description and classification. OPALINA OBTRIGONOIDEA AMERICANA, new subspecies. Type.—United States National Museum Cat. No. 16537. 83103—23 13. Please note that thes
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