18 THE LJ>fGUATULID ARACHNID RAILLIETIELLA FURCOCEKCA. 



given under a variety of names, such as P. gracile, P. crocodili, 

 and others, generally found in fish of the families Gymnotidse, 

 Characinidie, and Silurid* represent larval stages of the Sebekini, 

 Moreover, the feeding-habits of their definite hosts render this 

 hypothesis extremely probable. The same is probably the case 

 with the genus Reighardia. 



Many animals, in which tongue-worms of the genus Raillietiella 

 have been found, are purely insectivorous in their feeding-habits. 

 For example, the lizards of the genus Ccdotes and Gecko {E. 

 geckonis), AmpMshcena alba {R, ftircocerca (Diesing)) ; and the 

 Amphibian, Bufo melanostictus (R. indica (Gedoelst, 1921)). 



If even in the genus Raillietiella, as in all the others, there 

 exists a biological cycle which evolves in two different hosts, it 

 will be interesting to see in what intermediary host the larval 

 forms of these parasites of insectivorous animals pass their 

 existence, and how they manage to get into their definite host. 

 Could the intermediary host of Raillietiella be an invertebrate 

 animal ? 



