. Bulletin - United States National Museum. Science. Fig. i;14.—Opalina rotunda : a is magxified 460 diameters, and all the lines op CILIA ON THE UPPER SURFACE ARE SHOWN ; h, A GROUP OF CELLS, MAGNIFIED 117 DIAM- ETERS. This little OpaJina is usually very broad, but some narrower forms are seen. The body is thinnest in front and thickest behind. Its nuclei are for the most part ellipsoidal, but some are spherical. As the spherical ones are rather small, probably they are daughter nuclei not yet elongated into the typical resting condition. The species seems sharply distinct from any other. OPA
. Bulletin - United States National Museum. Science. Fig. i;14.—Opalina rotunda : a is magxified 460 diameters, and all the lines op CILIA ON THE UPPER SURFACE ARE SHOWN ; h, A GROUP OF CELLS, MAGNIFIED 117 DIAM- ETERS. This little OpaJina is usually very broad, but some narrower forms are seen. The body is thinnest in front and thickest behind. Its nuclei are for the most part ellipsoidal, but some are spherical. As the spherical ones are rather small, probably they are daughter nuclei not yet elongated into the typical resting condition. The species seems sharply distinct from any other. OPALINA CINCTA Collin (1913). Host.—Bufo hufo (Linnaeus) \Bujo vulgaris Laurenti], from Viarmes, France. As I have had no material of this species, I quote from Collin's description. Measurements, taken from CoUhi's /t^wre.—Length of body mm.; width of body mm.; diameter of spherical nuclei mm., length of anaphase nuclei mm.; width of same mm. In this orbicular Opalina the ectosarc is very wide around the whole contour of the body. The nuclei are very large, larger even than in O. form cinctoidea, and almost all are in division. This last is a noteworthy feature in a multinucleated Opalinid. We have seen it in many of the binucleated species, both Protoopalinas. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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