164 TROPICAL MEDICINE AND HYGIENE 



The opening of the buccal capsule is surrounded by two 

 delicate cuticular fringes the corona radiata ; these fringes 

 are composed of twenty four pieces. The buccal capsule 

 is elongated, the dorsal portion being slightly shorter than 

 the ventral. The oesophagus is stout and' muscular, and 

 triradiate in section. Each of the three surfaces is pro- 

 longed upwards into a chitinous plate projecting into 

 the buccal capsule. The free terminations of these plates 

 form the three teeth which guard the cesophageal opening. 

 The anus is subterminal. The genital opening in the 

 female opens posteriorly. It is twice as far from the 

 anus as that is from the pointed tip of the tail. 



These worms are blood-suckers, they are intestinal para- 

 sites, and in Turner's case were found in the large intestine. 



(Esophagostomnm brumpti. Round the anterior ex- 

 tremity of the worm is a transparent cuticular thickening, 

 surrounding the opening of the alimentary canal and armed 

 with chitinous plates. The buccal cavity is not dilated, 

 the mouth opens into the oesophagus, and the orifice of 

 the oesophagus is armed with three teeth. It is parasitic 

 in pigs and mammalia. In man it was found by Brumpt 

 in cysts in the wall of the large intestine. The specimens 

 were immature females and have been described as 

 (Esophagostomum brumpti. 



Other CEsophagostoma have been found in small, raised, 

 rounded tumours mainly in the lower part of the ileum, but 

 also occurring in the caecum and colon. They bulge into 

 the lumen, but are situated beneath the mucosa and some- 

 times beneath the muscular layer. The worms are found 

 singly in the interior of these tumours in the semi-liquid 

 contents of the cysts, which may be brownish in colour. 



The worms are often immature. In Thomas's case the 

 males were 17 to 22 mm. in length by '75 mm. in breadth. 

 Caudal pouch with thick ribs. Females 16 to 20 mm. in 

 length ; immature forms only '9 mm. in breadth. 



Possibly the encysted "ankylostomes" mentioned by 

 several observers in various parts of the Tropics, including 

 British Guiana, were CEsophagostoma, and in that case 



