. Bulletin - United States National Museum. Science. THE OPALINIIi CILIATE 123 ZELLERIELLA INTERMEDIA, new species. 'J'j/pe.—United States National Museum Cat. No. 16486. Host.—Bufo intermedins Guenther, two abundant infections, from United States National Museum specimens No. 26161 and 26162, 22 mm. lon<r (the type infection), both from Guanajuato, Mexico, A. Duges, collector. Measurements of an average individudh—Length of body mm.; width of bodj' mm.; thickness of body mm.; diameter of resting nucleus mm.; length of endospherule mm.; width of
. Bulletin - United States National Museum. Science. THE OPALINIIi CILIATE 123 ZELLERIELLA INTERMEDIA, new species. 'J'j/pe.—United States National Museum Cat. No. 16486. Host.—Bufo intermedins Guenther, two abundant infections, from United States National Museum specimens No. 26161 and 26162, 22 mm. lon<r (the type infection), both from Guanajuato, Mexico, A. Duges, collector. Measurements of an average individudh—Length of body mm.; width of bodj' mm.; thickness of body mm.; diameter of resting nucleus mm.; length of endospherule mm.; width of endospherule mm.; cilia line interval, anterior mm., middle mm., posterior mm. Four macrochromo- somes. This is a narrow, wedge-shaped species. One little peculiarity is observed, perhaps correlated Avith its form, namely, that the primary. Fl J. 89. ZELLERIELLA INTERMEDIA, X 460 DIAMETERS: fl, SHOWS SOME OF THE OF INSEETION OF THE CILIA ; C IS A VERTICAL, OBLIQUE, OPTICAL SECTION. (major) lines of cilia are farther apart over the middle of the body than they are behind. The nuclei are nearly spherical, but not quite so. They are distinct from each other, not being connected by a thread. Each shows four distinct chromatin masses which seem to be macrochromosomes. These are arranged as in a very early metaphase, with the chromos&mes distinct but irregularly placed. It seems appropriate to name this species intermedia^ both because its host is Bufo intermedins and because in the size of its nuclei it is intermediate between Z. hufoxena and Z. mlcrocarya, on the one hand, and some other species soon to be described. ZELLERIELLA INTERMEDIA CUNEATA, new subspecies. 7y;?e.—United States National Museum Cat. No. 16487. Host.—Bufo vallicex^s Wiegmann, two abundant infections, from Brownsville, Texas, in United States National Museum specimens. Please note that these images are extracted from scanned page images that may have been digit
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