APPENDIX ON TREMATODA AND NEMATODA 753 



APPENDIX ON TREMATODA AND 

 NEMATODA. 



BY 



J. W. W. STEPHENS, M.D., B.C., D.P.H. 

 TREMATODA. 



Artyfechinostomum sufrartyfex, Clayton Lane, 1915. Leiper 

 thinks this may be the same as Rchinostoma malayanum, Leiper, 

 1911, which species Odhner assigns to the genus Euparyphium. 



Metagonimus (Yokogawa) yokogawai occurs in dogs in Shanghai. 

 Encysted cercariae probably in the perch. 



Opisthorchis sp. Skin covered with spines. Gut forks almost 

 reach end of body. (Esophagus two to three times length of 

 pharynx. Ovary multilobed. Ovary and testes in posterior fourth 

 of body. Vitellaria end opposite the ovary. Distinguished from 

 0. felineus by presence of spines and lobed ovary ; from 0. pseudo- 

 felineus and 0. noverca by the lobed ovary, and by the fact that the 

 yolk glands do not extend as far as the anterior testis. It agrees 

 with Poirier's description of 0. viverrini in the Indian civet cat, but 

 whether this species has spines on the cuticle is not known. 



Habitat. Man in Chiengmai (Malay States). Fifteen per cent, 

 of prisoners in the jail showed the ova of this species in their faeces. 



Schistosome cercariae. 



Schistosome cercariae belong to the furcocercous division of the 

 Distomata cercariae. 



Distomata cercariae. 



Body without a floating membrane. Tail absent, or if present 

 not cleft to the base. Mouth anterior, gut forked. Oral sucker 

 present. Ventral sucker near middle of body. Eyes generally absent. 



Group Fercocercous cercariae, 



Cercariae single (not in colonies). Tail forked at its end. 



Family. Schistosomidae. 

 Pharynx absent. 



