ZOOLOGY FOR MEDICAL STUDENTS CHAP. 



,1 i In' spine which is small and inconspicuous is lateral 



; 7 . IJ, 3, and Fig. 90, D). The eggs reach the exterior 



the intestine as in S. mansoni and the sporocyst stage is 



passed in a water-snail Hypsobia (= Katayama) with a long pointed 



al shell. 



Is other flukes parasitic in man note should be taken of 

 lormilly inhabitants of Eastern Asia but liable to be carried to 

 other parts of the world by immigrants. 



CLONORCHIS 



Slender-shaped Liver-flukes which are placed in this genus are fre- 

 quent parasites in China and Japan and cause serious damage to the liver. 

 They reach a length of from 6 mm. to 20 mm. The fresh-water snail into 

 which the miracidinm bores is apparently a Melania and the cercariae 

 find their way into the bodies of various fresh-water fish where they 

 remain encysted amongst the connective tissue and muscle until swal- 

 low. (1 by the mammalian host. The latter is commonly a man, dog, 

 pig. 



PARAGONIMUS 



A . Minmon and destructive parasite of man (as of dogs and cats) 



in China, Korea and Japan, this fluke may occur in various organs of 



the body but its favourite haunt is the lung, in which as it grows in size 



it forms large cavities. It measures up to about 12 mm. in length and 



is thick-bodied, nearly circular in cross section. The eggs pass away in 



the sputum to which they give a characteristic brown colour. The 



lory is of the normal type, the incriminated water-snail being a 



Mrlania, except that as in Clonorchis the cercaria enters an intermediate 



encysting. Normally this appears to be a fresh-water crab, 



these are not commonly used as food by man in districts where 



ommon the suspicion is entertained that some other 



animal, possibly a fresh-water fish, may take the place of the crab. 



FASCIOLOPSIS 



Tins pantile, which inhabits the intestine of the pig and of man 



tern Asj a from India to China and the Malay Archipelago is 



"f interest from its being the largest fluke known to occur 



in man. reaching a length sometimes of 75 mm. Its life-history is 



Min. 



