224 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



'11 ic fonn of the body is sufficiently indicated by the drawings. 

 A characteristic nucleus from individual A is seen in figure 197, 5. 

 Obserxc tlie scattered chromatin particles connected by chromatin 

 fibers forming a network. Note also the central achromatic nu- 

 cleolus. The microchromatin granules and all the achromatic 

 .structures except the nucleohis are omitted from the drawing. 



Opalina ranai'um^ United States National Museum No. 16597. 



Ilofit. — Ra-na (lahnatina Fitzinger, United States National Museum 

 frog No. 11895, 70 mm. long, from Travnik, Bosnia, 1893 ; E. Brandes 

 collector; one infection. 



Fig. 19S.- 



-Opalina raxaru.m, from Rana dalmatinaj x 117 diameters. 

 nuclei in the cell are shown in the left drawing. 



MeaauremenU of a large individual. — Length of body 0.26 mm. ; 

 width of body 0.162 mm.; thickness of body, anterior 0.022 mm., 

 middle 0.019 mm., posterior 0.017 mm. ; diameter of nucleus 0.0055 

 mm. to 0.0062 mm. ; cilia line interval, anterior 0.0024 mm., posterior 

 0.0045 mm. 



These seem to be Opalina ranarum of the ordinary sort. 



OPALINA RANARUM, form TRUNCATA. new forma. 



ry/?e.— United States National Museum Cat. No. 16594. 



Host. — Rana temforaHa., from Wiirzburg, Germany, collected by 

 M. M. Metcalf in the fall of 1906. 



Measurements.— L(ii\gi\i of body, 0.34 mm.; width of body, 0.163 

 mm. ; thickness of body, anterior end, thicker side, 0.025 mm., thinner 

 side 0.016 mm. ; thickness of body, middle 0.0198 mm., posterior end 

 0.011 mm. : diameter of nucleus. 0.006 mm. to 0.0075 nun., incan. 0.0069 



