PLATE LI. 



Fio. 1. Head of />. uroijalli. 

 Highly niagnitied, with tlie 

 proboscis completely retracted. 

 Tliis specimen shows tlie cal- 

 careous bodies well, and the 

 hooks on both the proboscis 

 and around the suckers. 



^:^>,^ 



Fig. 2. Portion of the ring 

 of hooks wliich surrounds one 

 of the suckers of />. uro'inlli, 

 showing the irregular arrange- 

 ment of the hooks. Very 

 highly magnifie i. 



Fig. 3. Portion of the double circle 

 of hooks from the jiroboscis of D. urogalli. 

 Very highly magnified. 



Fig. 4. Ova of D. urorjalH. Very high!}' magnified, showing 

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

 vesicles. 



Fig. 7. Eggi of //. microps (Dicsing!, highly 

 magnified, containing each a six-liooked 

 embryo or onchosphcrc. 



Fig. 6. Isolated hooks of the 

 liead of Hymrnolepis microps 

 (Dicsiiig) seen under oil-immersion 

 lens. 



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

 higlily magnified, showing Tcrniti Imlrioylili embedded in 

 the deep layers of tlio intestinal wall. an. intestinal 

 mucosa ; b. muscular hn'crs ; sp. ]ieritoneal lining ; It. 

 anterior ends of the tapeworms ; c, mass of exudate 

 produced by the irrit^ition of the head of the T:unia. (From 

 Fiana, Mem. Ac. ISci. Instil. Bulogna, series 4, vol. ii., 1880, 

 p. 387.) 



DAVAIXHA CHOC. M.I.I, IIYMENOLEriS MICHOPS, ETC 



Opposite p. 337,] 



