TONGUE WORMS : INTERNAL ANATOMY 701 



already described. Porocephalus monlliformis and P. annillatus are the 

 two species which have been carefully studied ; both of these have been 

 found in man. 



Porocephalus nionilifonnis, Diesing. Male with twenty-six rings and 

 female with twenty-eight to thirty-two rings ; both sexes are somewhat 

 slender and taper towards the posterior extremity. 



The adult stage is found in the lung of the Indian Python (Python 

 tnolurus), also in the reticulated python, P. rcticulatus ; the nymph has 

 been recorded from man, monkeys, the tiger, civets, the cat and the dog. 

 Its life history is unknown. It is distributed throughout India, Indo- 

 China, Philippines, Sumatra and Java. 



Porocephalus annillatus, Wyman. Body slightly flattened on its an- 

 terior surface, and tapering from the middle towards the extremity. Male 

 with about sixteen rings and female with twenty to twenty-two rings ; 

 each of the rings is separated from its fellows by a wide space. 



The adult of this species has been found in the lungs of the African 

 Pythons, Python sebae and P. regius, and in a number of other snakes 

 from Africa ; the larva has been found in man as already noted, and in 

 monkeys, hedgehog and the lion. The nymphs have also been found 

 in these animals. Its complete life history is not known. 



Porocephalus crotali, Humbolt. Body cylindrical, incurved, and 

 slightly flattened on the ventral face ; female surrounded by about eighty 

 flat annuli. It is parasitic in the lungs of the rattle snakes of South 

 America ; its life history is unknown. 



Porocephalus pattoni, Stephens. Body greyish white, cephalothorax 

 globular and distinctly demarcated off from the abdomen ; posterior 

 extremity blunt. The number of rings varies from thirty-six to forty ; 

 there are usually thirty-eight in the male (Plate LXXXVIII, fig. 3). 

 An isolated hook is depicted in fig. 5 and the mouth ring in fig. 4 ; the 

 egg is shown in fig. 6. This species is parasitic in the lung of the rat 

 snake, Zamenis mucosus. Its life history is unknown. 



INTERNAL ANATOMY 

 PLATE LXXXVIII 



The alimentary tract of a linguatulid is comparatively simple. The 

 mouth is oval in shape and is situated on the ventral side of the cephalo- 

 thorax, between the inner pair of hooks, and is sur- 



Alimentary canal 

 rounded by a strong chitmous framework. It opens 



into the pharynx, which is a short tube leading upwards and backwards 



