. Bulletin - United States National Museum. Science. THE OPALINID CILIATE INFUSORIANS. 203 Measurements of a good-sized individual of the slender form.— Length of bodj', mm.; width of body, mm.; thickness of body, mm.; diameter of nucleus, mm. to ;8 mm.; length, and width of endospherules, first mm. by mm., second mm. by mm., third mm. by mm.; cilia line interval, anterior, mm., posterior mm. The measurements given by Dobell are different from the above.— Length of body, mm., or rather over; width of bod
. Bulletin - United States National Museum. Science. THE OPALINID CILIATE INFUSORIANS. 203 Measurements of a good-sized individual of the slender form.— Length of bodj', mm.; width of body, mm.; thickness of body, mm.; diameter of nucleus, mm. to ;8 mm.; length, and width of endospherules, first mm. by mm., second mm. by mm., third mm. by mm.; cilia line interval, anterior, mm., posterior mm. The measurements given by Dobell are different from the above.— Length of body, mm., or rather over; width of body, mm. at the broadest part of the anterior end; also smaller forms in the shape of a " flattened spindle," say, mm. long by mm. broad. Figures 171, a and &, are copied from Dobell's plate 2, figures 17 and 18, respectively. The animal figured by Dobell in his figure 17 is much more ohtrigo7ia-Vike than any I have found in the slide sent me. This Opalina is defined by its general form, its large nuclei, and especially by its elongated, slender endospherules which lie with their long axes transverse to the length of the body and parallel to its surface, conditions different from that of any other known Opalinid. There are in this species both long, slender forms and other broader forms. Some of the smallest individuals show degenerating nuclei and numerous smaller "secondary" (?) nuclei (fig. 171, c). The species seems clearly distinct. Considerations of geographical distribution and of structure have led me to question the relation- ship of this species to the Opalinae. (See p. 260.) OPALINA VIRGULOIDEA, new species. Type.—United States National Museum Cat. No. 16546. Host.—Hyla eximia Baird, four infections, from Mexico. The type infection is from United States National Museum specimen No. 14601, September 1; A. Duges Fig. 172.—Opalina virgdloidea, from Hyla eximia, X 117 diameters. Measurements of a large individu
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