SPARGANUM 53 



when taken by the mouth. Eosinophilia is not marked 

 in infections with this worm. 



(2) Diplogonoporus. In these there are two complete 

 sets of sexual organs in each proglottis, so that there are 

 two genital pores, and posterior to each a uterine opening. 

 Two pairs of ovaries and two distinct uteri. 



Diplogonoporus grandis, found in Japan, but is rare. It 

 is a very large tapeworm, up to 10 or 12 yards in length. 

 The structure of the head is unknown. The segments, 

 even when mature, are very broad in proportion to their 

 length, 14 to 16 mm. in breadth, about 0-5 mm. in length. 

 The arrangement of two complete sexual organs on each 



FIG. 22. Head of plerocercoid larva (Sparganuni). (Aboriginal of 

 British Guiana.) 



side of the middle line gives the appearance of two 

 streaks running along the flat surface of the worm. 

 Symptoms similar to those caused by Bothriocephalus 

 latus are said to occur. 



Another species, Krabbea grandis, in which the uterine 

 opening is on the opposite side to the genital pore, has 

 been described. This is a very rare species. 



For these species man is the definitive host, as he 

 harbours the parasite in its sexual or adult form. 



There are three known species of larval parasites, prob- 

 ably the plerocercoid larvae of Dibothriocephaloidea, that 

 have been found in man. Such forms are now placed in 

 a separate group, Sparganutn, but when the adult forms 

 are known they will be placed in their proper groups. 



Of the larval forms, Sparganum mansoni is fairly 

 common in Japan and China. They are usually found in 



