EEPTILIA 



455 



frog or duck, nor could all the other larvae which I subjected to 

 experiment be developed either in the green or brown frogs. 



" (m) . When young treinatodes arrive at the right place for 

 their maturation, then the male generative structures develop 

 before the female organs, and in the subsequent excess of egg 

 production the form and structure of the animal becomes 

 obliterated . 



ff (n). The yelk-molecules surrounding the germinal vesicle 

 are not directly transformed into an embryo." 



As regards the acanthocephalous parasites of reptiles, I may 

 observe that Echinorhynchus anthuris is very common in the 

 lesser water newt (Lissotriton punctatus) . In the accompany- 

 ing illustration (Fig. 76) I have represented the free ovarian 



FIG. IG.Eckinorhynckus anthuris. 1, Attached to the intestine; 2, specimen enlarged; 

 3, ovarian vesicle, including germs ; 4, germs in various stages ; 5, vesicle with germs 

 more advanced; 6, 7, eggs in their capsules; 8, free egg. Original. 



egg-bearing bodies, the development of the ovum, and the 

 adult worms. For anatomical details, however, I must refer to 

 my earlier treatise ( f Entozoa/ p. 100 et seq.). 



Amongst the species of entozoa that were found by me at the 

 Zoological Society's Menagerie I may mention Distoma coro- 

 narium and Ascaris lineata, from the intestines of Alligator 

 mississippiensis ; Dist. Boscii, from an American snake (Coluber)' 

 an immature nernatode, from the heart of Coluber Blumen- 

 bachii ; and Echinorhynchus inflexus, attached to the intestines of 

 a snapping turtle (Chelydra serpentina). I may add that the 



