154 BULLETIN 120, UNITED STATES NATIONAI. MUSEUM. 



C. madagascariensis, C. magna, and C. ohovidea. This group is but 

 one of several series of intergrading forms between those Cepedeas 

 which are more or less circular in cross section, and the much flat- 

 tened Opalinas. The existence of several such series of intergrades 

 seems to indicate the possibility of a polyphyletic origin for the forms 

 placed in the genus Opah'na. 



Fig. 119. — Cepedea globosa : a to d, magnified 117 diameters ; e, magnifiicd 460 



DIAMETERS. S 



CEPEDEA BAUDINII, new species. 



Type. — United States National Museum Cat. No. 16525. 



Host. — Hyla haudinii Dumeril and Bibron, two infections, one 

 from Guatemala and one, the t3'pe infection, from United States 

 National Museum specimen No. 30410, 53 mm. long, from Cordova, 

 Mexico ; F. Sumichrast, collector. 



M easurevients of an ordinary individual. — Length of body 0.087 

 mm.; width of body 0.0475 mm.; thickness of body 0.0386 mm.; 

 diameter of nucleus 0.00325 mm. to 0.00375 mm.; diameter of 

 endospherule 0.0016 mm.; cilia line interval, anterior 0.00185 mm., 

 middle 0.0025 mm., posterior 0.0025 mm. 



