PAROPISTHORCHIS CANINUS 



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Opisthorchis viverrini Poirier, 1886. 



Definition. — Opisthorchis with cuticle covered with minute 

 acicular spines. Ovary multilocular. Branches of intestine almost 

 reach the hinder end of the body, and the ovary and testes are 

 deeply lobed . 



Remarks. — 'This trematode, which belongs to the Indian civet-cat, 

 was obtained by Kerr from prisoners at Chiengmai, and recognized 

 by Leiper. 



Infection. — Infection is probably by eating raw or partially cooked 

 fresh- water fish. 



Paropisthorehis Stephens, 1912. 



Definition. — 'Opisthorchiinse with lobed testes and with ventral 

 process on which are situate the ventral sucker and the genital pore. 

 Type Species. — -Paropisthorehis caninus Barker, 1912. 



Paropisthorehis caninus Barker, 1912. 



Definition. — 'Paropisthorehis with the generic characters. 



Remarks. — -Cobbold in 1858 found a little fluke, Distomum con- 

 ]unctum, in the bile-ducts of Canis fulvus Lewis, the American fox. 



Fourteen years later Lewis and Cunningham found the same 

 fluke in Indian pariah dogs, and in 1874 McConnell found what 

 was thought to be the same fluke in human beings in Calcutta. 

 In 1903 Braun pointed out that the American and Indian flukes 

 were different, and named the latter Opisthorchis noverca {vide infra, 

 Amphimerus) . 



In 1912 Barker separated the parasite of the Indian pariah dog 

 from the human, calling the former 0. caninus ; and in the same 

 year Stephens created a separate genus for it. Leiper still main- 

 tains, however, that these two forms, in man and dog, are identical. 



It is not known to occur in man. 



Amphimerus Barker, 191 2. 



Definition. — Opisthorchiinae without ventral process, but .with 

 lobed testes and vitellaria divided by the position of the ovary into 

 anterior and posterior lobes. 



Type Species. — Amphimerus noverca Braun, 1903. 



Remarks. — -This genus was created for Braun's Opisthorchis noverca, 

 which, as explained above according to Stephens, only applies to 

 McConnell's flukes, found in two Mohammedans in Calcutta. 



Amphimerus noverca (Braun, 1903). 

 Definition. — Amphimerus with the characters of the genus. 



Morphology. — It is lancet-shaped, with anterior and posterior extremities, 

 pointed body, covered with spines; 9'5 to 12-7 millimetres in length and 

 2'5 millimetres in breadth, with two suckers very close together, the anterior 

 being larger than the posterior. The genital pore opens just in front of the 

 ventral sucker. The pharynx is spheroidal, and the intestinal caeca extend 

 far back. The two testes are very distinct, the anterior rounded and the 



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