198 



BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



Measurements of a shorty hroad individual. — Length of body 0.24 

 mm. ; width of body 0.132 mm. ; thickness of body 0.023 mm. ; diam- 

 eter of nucleus 0.003 mm. to 

 0.0035 mm., many ellipsoidal, 

 0.0035 mm. by" 0.003 mm.; 

 cilia line interval, anterior 

 0.00145 mm., posterior 0.0028 

 mm. 



A few individuals of this 

 Ofalina are ohtrigona-Y\!\^^ 

 in form, but most are wider. 

 The infections have a quite 

 different appearance from 

 those of O. ohtrigonoidea^ 

 nor does this form resemble 

 0. obtHgonoidea lata or 0. 

 ohtrigonoidea orhiculata. 



Fig. 166. — Opalina guatemalae, X 117 diam- 

 eters. Three different infections are rep- 

 resented. 



OPALINA WOODHOUSI, new species. 



Ty^e.— United States National Museum No. 16539. 



Host. — Bufo woodhousi Girard, three infections, two from Ari- 

 zona; the other, the type infection, from United States National 

 Museum specimen No. 36364, 64 mm. long, from Utah, June 26, 1905. 



Fig. 167.^-0palina woodhousi^ X 117 diameters. 



Measurements of a large individual. — Length of body, 0.5. ; width 

 of body, 0.2 mm.; thickness of body, 0.023 mm.; length of nuclei, 

 first 0.0065 mm., second 0.0071. mm.; width of nuclei, first 0.0046 

 mm., second 0.006 mm. ; daughter cells with some almost spherical 



