CESTODA. GENERAL DISCUSSION 57 



Paragonimus westermanii. Color faint reddish brown; 

 shape plump, oval like a coffee grain; length 7.5 mm. to 

 12 mm., width 4 mm. to 6 mm.; thickness 3.5 mm. to 5 

 mm.; cuticula covered with spines; acetabulum slightly 

 larger than oral sucker, just in front of the middle of the 

 body; genital pore, just behind acetabulum; habitat lungs, 

 pleura or bronchi of man,- dog and cat; cercaria develops 

 species of Melania a common fresh water snail in Japan; 

 encysted stage in land crab or cray-fish; man infected by 

 eating raw crab containing cysts; produces severe pulmonary 

 disturbances which are often complicated with tuberculosis; 

 found in man in Japan, China, Korea, Formosa and Philip- 

 pine Islands. 



F. Blood Flukes 



Genus Schistosoma. Sexes separate; female elongate, 

 enclosed in gynaecophoric canal of male at copulation; no 

 pharynx present; intestinal ceca unite into a single median 

 stem in posterior part of body; cercaria forked-tailed, devel- 

 ops in sporocysts in fresh water snail, and penetrates directly 

 through the skin of the human host; three species have been 

 described from man, i.e., Schistosoma haematobium S. 

 mansoni and S. japonicum (Plate VII, Fig. 2) . (See page 54.) 



5. CESTODA 

 A. Definition 



Cestodes or tapeworms, ribbon shaped flat worms, divided 

 into segments called proglottids; organ of attachment a 

 scolex with suckers or hooks; no digestive tract present. 

 The human cestodes fall into two different orders; i.e., the 

 Pseudophyllidea and the Cyclophyllidea. 



