114 BULLETIN 120, UNITED STATES NATIONAL MUSEUM. 



Measurements of an ordinary individual. — Length of body 0.14 

 mm. ; -width of body 0.07 mm. ; diameter of nucleus (somewhat 

 shrunken) 0.0098 mm. ; diameter of endospherule 0.0018 mm. ; cilia 

 line interval, anterior 0.00172 mm., middle 0.002 mm., posterior 

 0.0032 mm. 



This somewhat wedge-shaped species has nearly spherical nuclei. 

 Mitotic phenomena were not observed. The preservation is poor, 

 the nuclei being shrunken with crinkled wall. Evidently in normal 

 condition their diameter would be greater. The massive chromatin 

 is generallj^ aggregated into two or three balls of considerable size, 

 almost surely an abnormal condition in this stage of the life-cycle. 



ZeUeriella [of Hyla septentrionalis'] resembles Z. hrasiliensis in 

 form of body, but its resting nuclei are in a different mitotic phase, 

 being more spherical than those of the latter species. It also re- 

 sembles in form the more wedge-shaped individuals of Z. couchil, 

 with which it agrees in all measurements except that its nuclei are 

 but about two-thirds the size of those of Z. couchii. Since, however, 

 the nuclei of Z. septentrionalis are shrunken, the two species may 

 rather closely agree in the size of their nuclei. The average body 

 form in the infection of Z. sepfentHonalis is different from the 

 average body form in my material of Z. couchii. Their hosts be- 

 long to different families of Anura and one is found in the Bahamas, 

 the other in Texas. More extensive and better preserved material 

 from a larger series of infections in both hosts is needed for ade- 

 quate comparisons, so I am merely referring the Bahama form to 

 its host, leaving open the question of its validity as a species. 



ZELLERIELLA VENEZUELAE, new species. 



Type.— United States National Museum Cat. No. 1G482. 



Host. — Hyla venulosa (Laurenti), two scant infections, from 

 La Guaira. Venezuela, July 3, 1900; Lyon and Robinson, collectors. 

 Of these, the type infection was from United States National Mu- 

 seum specimen No. 27797, 95 mm. long. 



Measurement: A, of a large, dividing individual; B, of an average 

 individual — 



Measurements. 



Length of body 



Width of body 



Length of nucleus 



Width of nucleus 



Dianaeter of resting nucleus. 

 Diameter of endospherule. . . 



0015 



.016 

 .0015 



