184 



THE ANIMAL PARASITES OF MAN 



the lacteals. The former were supposed to be the ova of some 

 hitherto undescribed species of worm. The fact of their having 

 been taken for Coccidia is not very surprising. Many times before 

 the ova of worms have been taken for Coccidia, and conversely 

 Coccidia have been mistaken for the ova of worms. In the earliest 

 recognised case of coccidiosis in man (Gubler's case), the Coccidia 

 were at first regarded as the eggs of a trematode. At length, in the 

 smaller mesenteric blood-vessels, Catto found male and female speci- 

 mens of a new species of trematode belonging jto ^the genus Schisto- 

 soma, and noticed that the ova within the uterus of the female worm 

 corresponded in every way with the oval bodies J:ound in the various 



organs. In the bowel 

 of this case were also 

 found specimens of the 

 more common parasitic 

 worms Tricocephalus 

 trichurius, Uncinaria 

 duodenalis and A scar is 

 htmbrico'ides together 

 with their respective 

 eggs. It was clear, 

 however, that the ana- 

 tomical lesions afore- 

 mentioned were due to 

 the trematode parasite. 

 Specimens of the 

 trematode were sent to 

 Professor Blanchard, 

 who recognised that 

 they belonged to a new 

 species which he named 

 Schistosoma cattoi. 

 After the publication of his paper Dr. Catto received a section of 

 intestine prepared in Japan in 1900, which showed ova having exactly 

 the same characters and occupying the same position in the intestine 

 as in his own case. 



Morphologically, Schistosoma japonicum is "tibt unlike the well- 

 known S. hcematobium discovered by Bilharz in 1851. The dis- 

 tinctive characteristics of the new trematode are its smaller dimen- 

 sions ; the larger size of its acetabulum or posterior sucker as 

 compared with the anterior sucker ; the .smooth, non-tuberculated 

 integument of the male ; the smaller, non-spined ova contained in 



FIG. 116. Section of appendix (stained), showing 

 ova in masses, a dense submucous layer, and a less 

 marked subperitoneal layer. 



