. Bulletin - United States National Museum. Science. THE OPALIXID CILIATE IXFUSORIAXS. 67 Measurements of an ordinary individual.—Length of body mm.; width of body mm.; thickness of body mm.; length of nucleus mm.; width of nucleus mm.; diameter of endospherule mm.; cilia line interval, anterior mm., middle mm., posterior mm. The body of this Protoopalina is ovate, or obovate, in face view and considerably flattened, its thickness being about one-third of its width. The posterior end is often slightly, but definitely, pointed, and in so
. Bulletin - United States National Museum. Science. THE OPALIXID CILIATE IXFUSORIAXS. 67 Measurements of an ordinary individual.—Length of body mm.; width of body mm.; thickness of body mm.; length of nucleus mm.; width of nucleus mm.; diameter of endospherule mm.; cilia line interval, anterior mm., middle mm., posterior mm. The body of this Protoopalina is ovate, or obovate, in face view and considerably flattened, its thickness being about one-third of its width. The posterior end is often slightly, but definitely, pointed, and in some cases the position of the excretory pore is indicated by a funnel-shaped depression at the base of this point. The axial ex- cretory organ is usually well developed, its relation to the nuclei being clearly seen. The two nuclei are almost, but not quite, spherical, their long axes being just noticeably the greater. Their in- ternal structure is not clear in my ma- terial. The considerable flattening of this species suggests a transition toward the condition of the Zelleriellas (to be de- scribed later), and this transitional con- dition is emphasized still more by the conditions in Protoopalina xyster and Zelleriella telniatohii, to which we will now turn. PROTOOPALINA XYSTERr" new species. Type.—United States National Mu- seum Cat. No. 16497. Host.—Gastrophrylie usta (Cope), one abundant infection from United States National Museum specimen No. 10021, female with eggs, from Tehuantepec, Mexico; F. Sumichrast, collector. Measurements.—Length of body mm.; width of body mm.; thickness of body, anterior quarter mm., middle mm., posterior quarter mm.; length of nucleus mm.; width of nucleus mm.; length of endospherule mm.; width of endospherule mm.; cilia line interval, anterior mm., middle mm., posterior mm. This interesting species shows many individuals with the posterior end of the b
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