Œs. stephanostomum, Stossich, 1904, in the large intestine of gorilla. Œs. 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.—Œsophagostomum stephanostomum var. thomasi: portion of the ileum, showing a cyst with protruding worm. × 8. (After Thomas.)

Fig. 322.—Œsophagostomum ste­pha­no­sto­mum var. thomasi: colon with œ­sopha­go­stome withdrawn from its cyst cavity. × 20. (After Thomas.)

Œsophagostomum apiostomum, Willach, 1891.