298 



(Hymenolepsis diminuta) 



Taenia nana 



(Hymenolepsis nana) 



Taenia confusa 



Dibothriocephalus latus . 



Drepanidotaenia setigera 



GENERAL BIOLOGY 



Twelve cases known 



in man. 

 Common in Italy 



and known in 



America. 



A few cases in Man. 



Man and Dog 



Common in Fin- 

 land and regions 

 where fish is a 

 common food. 



Goose 



In peritoneum and 

 muscles of pike, 

 perch, and trout. 



Water-flea and Cy- 

 clops brevicauda- 

 tus. 



THE THREAD-WORMS 

 NEMATODA. 



The nematodes are the thread-worms or round worms which make 

 up the phylum Nemathelminthes. 



ovy 



Fig. 185. A Cross Section, Ascaris Lumbricoiftes. 



A, Transverse section, cu., cuticle ; dl., dorsal line ; der. epthm., epidermis ; ex.v., 

 excretory tube ; int., intestine ; lat. 1., lateral line ; m., muscular layer ; ovy., ovary ; 

 ut., uterus ; v.v., ventral line. 



. B. A female cut open to show internal structures. 1, pharynx; 2, intestine; 

 3, ovary ; 4, uterus, 5, vagina ; 6, genital pore ; 7, excretory tube ; 8, excretory pore. 

 (A, after Vogt and Yung; B, after Shipley and MacBride.) 



