84 PARASITOLOGY. 



Acanthocephala (acantha— thorn; cephale— head) 

 includes the genus Echynorhynchus, which infests 

 the intestinal tract. 



Plathelmintha (flat— wide) includes the orders 

 Cestoda and Trematoda. 



Cestoda (kesto — girdle) includes the family 

 Taenidae and genus Taenia (tape worms) which 

 in the adult state infest the intestines. 



The family Bothriocephalidae includes the genus 

 Bothriocephalus, which passes the larval stage in 

 fish. 



Trematoda (perforated) includes the families 

 Fasciolidae, Paramphistomidae and Schistosomi^ 

 dae. 



The family Fasciolidae includes the genera Disto= 

 ma and Paragonimus, which live in the liver and 

 lungs. 



The family Paramphistomidae includes the genus 

 Amphistoma, which infests the stomach. 



The family Schistosomidae includes the genus 

 Schistosoma, which lives in the blood. 



CLASSIFICATION OF THE COMMON INTERNAL 

 PARASITES. 



Branch Vermes 



Class Annelida 



Order Discophori 



Family Gnathobdellidae 



Genus and Species Haemopis Sanguisuga. 



Class Nemathelmintha 



Order Nematoda 



Family Filaridae 



Genus and Species Spiroptera Scutata. 



Spiroptera Megastoma. 



Spiroptera Microstoma. 



