. Bulletin - United States National Museum. Science. Fig. 193.—Opalina hi'laxena, form parvixu- n-eata, x 117 diameters. the heavy black lines in the lower right figure indicate the plication of the body. Jjost. Hi/la vermicolov LeConte, tadpoles, niuueiuus ijifectiona from Woods Hole, Massachusetts, July, 1919; E. C. Just collector. Metwurements of a large individual.—LengtR of body nun.; width of body mm.; thickness of body, anterior mm., mid- dle mm., posterior mm.; diameter of nu- clei mm. (usual) to mm.; diameter of en- dospherules mm. to
. Bulletin - United States National Museum. Science. Fig. 193.—Opalina hi'laxena, form parvixu- n-eata, x 117 diameters. the heavy black lines in the lower right figure indicate the plication of the body. Jjost. Hi/la vermicolov LeConte, tadpoles, niuueiuus ijifectiona from Woods Hole, Massachusetts, July, 1919; E. C. Just collector. Metwurements of a large individual.—LengtR of body nun.; width of body mm.; thickness of body, anterior mm., mid- dle mm., posterior mm.; diameter of nu- clei mm. (usual) to mm.; diameter of en- dospherules mm. to mm.; cilia line inter- val, anterior mm., middle mm., mm. These Opalinas are of the same shape as 0. hylaxena. form orhiculata, from the same lot of tadpoles, but their nuclei are very much smaller. Pending a fuller knowledge of the relation of nuclear size to physiological condition nnd phase of life cycle, it seems best to place the individuals of this sort as a forma under the species hylaxena. OPAUNA HYLAXENA, form GEORGIANA, new forma. Type.—United States National Museum Cat. No. 16574. Host.—Hyla versicolor LeConte, one infection, from United States National Museum speci- men No. 44550, 45 mm. long, from Tate, Georgia, July 4, 1908; Howell, col- lector. Measurements of a hroad individual.—Length of body mm.: width of bodj^ mm.; diam- eter of nuclei mm. to mm., mean mm.; diameter of endo- spherule mm. to mm.; cilia line in- terval, anterior mm. In this infection some individuals are as broad as the orbiculate and parvinuclcate forms of 0. hylaxena, while others are almost as narrow as the ordinary individuals of this species, but in all indi- viduals the nuclei are small, as in the forma ' Fig. 194.—Opalina hylaxena, form georgiana, X 117 diameters. The more marked irregulari- ties OF FORM ARE DUE TO DISTORTION FROM PRES- SURE AT THE TIME THE SPECIilENS W
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