PLATE LI. 



FIG. 1. Head of I), uror/alli. 

 Highly magnified, with the 

 proboscis completely retracted. 

 This specimen shows the cal- 

 careous bodies well, and the 

 hooks on both the proboscis 

 and around the suckers. 



FIG. 2. Portion of the ring 

 of hooks which surrounds one 

 of the suckers of D. urogalli, 

 showing the irregular arrange- 

 ment of the hooks. Very 

 highly magnified 



FK;. 3. Portion of the double circle 

 of hooks from the proboscis of D. urogalli. 

 Very highly magnified. 



FIR. 7. Egg i of H. microps (Diesing), highly 

 magnified, containing each a six-hooked 

 embryo or onchosphcrc. 



FIG. 4. Ova ofD. urogalli. Very highly magnified, showing 

 the six-hooked embryo or onchospherc and traces of the yolk- 

 vesicles. 



FIG. 6. Isolated hooks of the 

 head of Hymcnolcpis microps 

 (Diesing) seen under oil-immersion 

 lens. 



FIG. 5. Transverse section of the walls of intestine of a fowl, 

 highly magnified, showing Tirniu botriopliti embedded in 

 the deep layers of the intestinal wall. aa. intestinal 

 mucosa ; b. muscular layers ; sp. peritoneal lining ; It. 

 anterior ends of the tapeworms; c., mass of exudatc 

 produced by the irritation of the head of the Tienia. (From 

 Piana, Mem. Ac. Hci. Iiistit. Bologna, series 4, vol. ii., 1880, 

 p. 387.) 



DAVAINEA UROGALLI, HYMENOLEPIN MIC HOP H, ETC. 



Ommsi/c n. 337.1 



