. Bulletin - United States National Museum. Science. 174 BULLETIN 120, UNITED STATES NATIONAL Fig. 141. — Cepedea (?) FLAV.\. (Aftek Stokes.) CEPEDEA (?) FLAVA (Stokes). OpaJina flaia Stokes (1884) Host.—Scaphiopus solitm^us Holbrook, onci scant infection in a young individual, date and locality not mentioned, studied by Stokes (1884 and 1888). Stokes' description is as follows.— Opalina flava, sp. nov. Body ovate, inflated, often as long as broad, or sub- pryriforni, widest and rounded, posteriorly, the length one and one-half times tlie breadth; the right and left hand borders evenl
. Bulletin - United States National Museum. Science. 174 BULLETIN 120, UNITED STATES NATIONAL Fig. 141. — Cepedea (?) FLAV.\. (Aftek Stokes.) CEPEDEA (?) FLAVA (Stokes). OpaJina flaia Stokes (1884) Host.—Scaphiopus solitm^us Holbrook, onci scant infection in a young individual, date and locality not mentioned, studied by Stokes (1884 and 1888). Stokes' description is as follows.— Opalina flava, sp. nov. Body ovate, inflated, often as long as broad, or sub- pryriforni, widest and rounded, posteriorly, the length one and one-half times tlie breadth; the right and left hand borders evenly rounded; striations of the cuticular surface obliquely disposed and bearing the long, fine, vibratile cilia; nuclei (?) numerous, small, scattered; sarcode enclosing many refractile corpuscles and larger spherical l)odies apparently vacuolar; contractile vesicle none; paren- chyma lemon yellow, the color darkest near the periphery, where it is disposed in a layer, the central portion of the sarcode being comparatively colorless. Length ^j^^ to ^|^ of an inch. Habitat, the rectum of the spade-foot hermit toad, Scaphiopiis holbrooki [S. solitarivs Holbrook]. Stokes further says: The infusorian is broadly ovate, soft and flexible and somewhat changable in shape, assuming at will a subpyriform or subglobular figure. Also: Its numbers are not great: perhaps a dozen were noted in the contents of the rectum. Neither is it always to be found. Also: * * * associated with them was * * * .^ large species of Opalina, whch I have, after some hesitation, identified with 0. ranarum Purk. * * * Their appearance and structure are those of the latter, but the size is much less. They are quite active. As they pressed each other beneath the surface or forced each other upwards, the aspect of the field of view was comically like a pool of furiously boiling soup with big dumplings bobbing about. It is difficult to determine what Opalinids Stokes saw in this in- fection. The yellow color emph
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