. Bulletin - United States National Museum. Science. THE OPALINID CILIATE IXFUSORIANS. 151 of nucleus mm.; width of iiiicleiis mm.; diameter of endospheriile mm.; cilia line interval, anterior mra.^ middle mm., pos- terior mm. This large Cepedea has the dimidiata form and general character. It is slightly flattened. The well-developed ax- ial series of vacuoles connects it clearly with the preceding two species. CEPEDEA OBOVOIDEA, new species (flg. 118).. Fig. 115. CErEDE.\ MAD.\GASCARIENSIS, X 117 DIAMETERS. Tijpe.—United States National Museum Cat.
. Bulletin - United States National Museum. Science. THE OPALINID CILIATE IXFUSORIANS. 151 of nucleus mm.; width of iiiicleiis mm.; diameter of endospheriile mm.; cilia line interval, anterior mra.^ middle mm., pos- terior mm. This large Cepedea has the dimidiata form and general character. It is slightly flattened. The well-developed ax- ial series of vacuoles connects it clearly with the preceding two species. CEPEDEA OBOVOIDEA, new species (flg. 118).. Fig. 115. CErEDE.\ MAD.\GASCARIENSIS, X 117 DIAMETERS. Tijpe.—United States National Museum Cat. No. 16516. Host.—Bufo lentiginosus Shaw, two infections, from Auburndale, Floridi, March, 1912, N. E, Wood, collector. The type infection is from United States National Museum specimen No. 48779,63 mm. long. Measurements of a good-sized individual.—Length of body mm.; width of body mm.; thick- ness of body mm.; length and breadth of nuclei, first specimen mm. by mm., sec- ond specimen mm. by mm., third speci- men mm. by mm.; diameter of endo- spherule mm.; interval, anterior mm., middle mm., posterior mm. This good-sized Cepedea is well demarcated from other species, 1, by its broad, rounded, anterior end; 2, by its long and x^vy abundant cilia; 3, by the considerable flattening of its body. Its nuclei are broadly ellipsoidal. Its endospherules are small and globular. In progressive flattening of the body, Cepedea magna., C. ohovoidea., and C. madagascariensis form a series in the order named. There is no indication that the flattened forms (the genus Opalina) arose through these particular species, but these species show the probable manner of origin of the Opalinae by a progressive flattening of the body. Apparently this flattening began with the anterior end of the body, even so thick a form as Cepedea dimidiata form sellei^i having its anterior end wedge-shaped. Fig. 1
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