444 



THE ANIMAL PARASITES OF MAN 



immature, 16 to 20 mm. long by 900 //, thick, tail ending in a little 

 conical appendage. Anus 230 //,, vulva 500 yu, to 525 //, from tip. 

 Ovejectors close together. Uteri very short in form of oblong pouch, 



(Es. stephanostoinuni, Stossich, 1904, in the large intestine of gorilla. 

 (Es. stephanostomum var. dentigera, Raill. and Henry, 1909, in the 

 chimpanzee. 



Habitat. In large and small intestine of man, Brazil. 



Pathology. Nodules occur in the gut wall ; 187 were found by 

 Thomas in his, the sole case. The tumours contain each a single worm. 



FIG. 321. CEsophagostomum Stephanos I omum 

 var. thomasi : portion of the ileum, showing a cyst 

 with protruding worm, x 8. (After Thomas.) 



FIG. 3 22 - CEsophagostoimun ste- 

 phanostomum var. thomasi : colon with 

 oesophagostome withdrawn from its cyst 

 cavity. x 20. (After Thomas.) 



CEsophagostomum apiostomum, Willach, 1891. 



According to Leiper, (Es. brumpti is identical with, and hence a 

 synonym of, this species. Parasitic in large intestines of monkeys, 

 producing dysentery, and in man (Northern Nigeria). 



According to Walker this species is common in Philippine monkeys. 

 Ova are scanty in the faeces. They measure 73 //, to 84 p by 44 //, to 

 57 ft and are in the morula stage. They are easily cultivated. The 

 rhabditiform larva is 340 /* by 16 //, and has a long filiform tail. It 

 moults twice, and at the second moult becomes a nlariform larva 

 retaining the skin of this moult, this stage being that of the mature 

 larva. It.now measures 9 mm. long by 30 ^ thick. Walker suggests 

 that the mode of infection is similar to that of ancylostomes. 



