(ESOPHAGOSTOMUM 441 



Female 12 to 16 mm. long by 650 p to 730 //, thick. CEsophagus 

 860 //, long. Vulva forms a distinct projection 480 fj, from tip of tail. 

 Anus 240 fju to 270 fjb from tip. Eggs 60 /j, to 80 //, by 40 p. 



Habitat. Large intestine of a negro (Comoro Islands) and in the 

 natives of Nyasaland and Portuguese East Africa. Also in large 

 intestine of Macacus sineiisis and Macacus cynoinolgus. 



Genus. CEsophagostomum, Molin, 1861. 



No teeth. Cuticle around the mouth dilated to form a narrow 

 cuticular " peristomic collar." Separated by a constriction from this 

 is a much more extensive inflation, the " cephalic vesicle," bounded 

 abruptly behind on the ventral side by a transverse groove, the 

 " ventral cleft," which is always present even in absence of the vesicle, 

 Buccal cavity of slight depth with a short dorsal, tunnel. Internal 

 margin of the mouth armed with chitinous leaflets ("external crown"); 

 internal border of the buccal capsule armed with short tongue-like 

 leaflets (internal crown). Lateral membranous wings may extend 

 backwards from the ventral cleft. Cervical papillae present. Bursa 

 with two lateral lobes united by a smaller median lobe. Spicules 

 over 5 mm. long, slender ; gubernaculum inconspicuous. Vulva 

 in front of anus. Adults usually in large intestine of ruminants, 

 suidae, tapirs, edentates and apes. Larvae sometimes in nodules in 

 intestinal wall. 



CEsophagostomum brumpti, Railliet and Henry, 1905. 



Female immature, 8*5 to 10*2 mm. long, 0*295 to 0*325 mm. 

 thick. Cuticle transversely striated. The cephalic vesicle imme- 

 diately behind the vestibulum oris, embracing the anterior two-fifths 

 of the oesophagus, extending ventrally, however, tow r ards its posterior 

 end. Vestibulum oris formed by a cuticular band provided with a 

 crown of twelve apical leaflets directed forward and inwards ; six 

 cephalic papillae (two lateral, four submedian) ; buccal capsule in front 

 of cervical swelling not delineated circularly behind, but provided 

 with three wide incisions (one dorsal, two sub-ventral). (Esophagus, 

 0*470 to 0*500 mm. long, two cervical papillae at five-eighths of 

 its length. Vulva 0*350 to 0*475 mm., anus 0*170 to 0*200 mm.,, 

 before tip of tail. 



Habitat. Found by Brumpt in tumours of the caecum and colon 

 of a native of the River Omo (Lake Rudolph), East Africa. Immature 

 forms only were present. Adults have been found in similar tumours 

 in monkeys. 



Pathology. They occur in haemorrhagic cysts in the submucosa or 



