. Bulletin - United States National Museum. Science. THE OPALINID CILIATE INFUSORIANS. 149 Measurements of an ordinary individual.—Length of body mm.; width of body mm.; thickness of body mm.; diam- eter of nucleus mm. to mm.; diameter of endospherule mm. to mm.; cilia line interval, anterior mm., middle mm., posterior mm. This spindle-shaped Cepedea is somewhat dimidlata-like in form, but it differs from the dididiata group in having a greatly developed axial excretory vacuole. The much greater development of this structure i
. Bulletin - United States National Museum. Science. THE OPALINID CILIATE INFUSORIANS. 149 Measurements of an ordinary individual.—Length of body mm.; width of body mm.; thickness of body mm.; diam- eter of nucleus mm. to mm.; diameter of endospherule mm. to mm.; cilia line interval, anterior mm., middle mm., posterior mm. This spindle-shaped Cepedea is somewhat dimidlata-like in form, but it differs from the dididiata group in having a greatly developed axial excretory vacuole. The much greater development of this structure in this species and in the species madagascariensis, magna, ohovoidea, glohosa, and haudinli, next to be described, seems to set them apart from the dimidiata group, on the one hand, and from the longa group, on the other hand. CEPEDEA MADAGASCARIENSIS, new species (figs. 114 and 115). Type.—United States National Museum Cat. No. 16514. Host.—MegalixaJus madagascariensis Dumeril and Bibron, one infection, from United States National Museum specimen No. 33879, 26 mm. long, no date, no locality; F. Werner, collector. Measurements: A, of a Tnediwrn-sized individual; B, of a large individual— Measurements. Length of body Width of body Thickness of body: Anterior Middle Posterior Length of nucleus Width of nucleus Length of endospherule. Width of Cilia line interval: Anterior Middle Posterior. TO771. .07 .0055 .003 .0019 .0012 .002 .003 .0036 The shorter individuals of this species are often considerably flat- tened, more so in front than behind. Others are very much elon- gated and more slender. The species seems to form a transition from the dimidiata-like forms to the longa-like forms on the one hand, and to the Opalinas, on the other hand. This interpretation is con- firmed by study of two other species parasitic in two of the Bufos, Cepedea m/igna, a very slightly flattened form, and C. ohovoidea, whose thickness is two-thirds of its width. Figure 11
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