THE OPALINID CELIATE INFUSOEIANS. 



97 



ZELLERIELLA LEPTODACTYLI, new species. 



Type.— Vnited States National Museum Cat. No. 16469. 



Hosts. — Four species of Leptodactylus : L. albilabris (Giinther), 

 six abundant infections from Porto Rico, Vicuez Island, and Te- 

 huantepec, Mexico; L. caliginosus Girard, one abundant infection 

 from Tehuantepec,, Mexico; L. gracilis (Dumeril and Bibron), two 

 abundant infections from Tehuantepec, Mexico; and L. microtis 

 (Cope), four good infections from Lake Amatitlan, Guatemala. 

 These infections were all in specimens from the United States Na- 

 tional Museum and are listed in section 8 of this paper. The type 

 infection is from L. albilabris No. 10029, four specimens, one unin- 

 fected, one scantily, and two abundantly infected. They are from 

 Tehuantepec, Mexico; F. Sumchrast, collector. Specimens of this 

 Opalinid from each of the other hosts are deposited in the United 



a b 



Fig. 65. — Zelleeiella leptodactyli, from Leptodactylus albilabeis, x 460 diametees. 



States National Museum as follows: Cat. No. 16633 (from L. caligi- 

 nosus) ; Cat. No. 16634 (from L. gracilis) ; Cat. No. 16635 (from 

 L. microtis). 



Measurements of an average individual from Leptodactylus al- 

 bilabris. — Length of body 0.105 mm.; width of body 0.067 mm.; 

 thickness of body 0.017 mm. ; diameter of nucleus 0.013 mm. ; cilia 

 line interval, anterior 0.0011 mm., posterior 0.0028 mm. 



In this species the posterior end of the body is not pointed in any 

 individuals. In one well-preserved infection from Leptodactylus 

 albilabris the nuclei are seen to be resting in a condition that is a 

 transition from the reticulate to the skein phase of mitosis. 



The single infection from L. caliginosus does not show the nuclei. 

 Either the preservation is poor, or the nuclei are degenerate (possibly 

 as Neresheimer has described for two multinucleate species?). The 



