8 4 



TLATYHELMINTHES CESTODA 



CHAP. 



Cestode. 



Drcpanidotaenia 

 gracilis Zed. 



Final host. 

 Duck, Goose, Wild ( 



Duck 



D. anatina Krabbe Duck . 



D. setigera Frbh. Goose . 



D ivfundibull- J Common Fowl 



fortius Goeze (_ 



Dicranotacnia f Duel- 



coronula Duj. \ 



Davainca proglot- f y -< 

 Una Dav. \ 



D. madagascari- ( Children 

 ensis Dav. ^ 



D. fricdbergeri 

 v. Liust. 



Mesocestoides line 

 atus Goeze 



Larva. 

 Cercocystis Till. 



\ Pheasant 

 {Dog . 



Intermediate host. 

 The Ostracods Candona 

 trata and Cypris comprcssa 

 and also Cyclops viridis 



j Cypris incongrucns, and also 

 \ 'Perch 



Cyclops brcvicaudatAis 

 House-fly 



Cypris ovum 



? Limax cinercus, L. agrcstis 



? Ants 



Botliriocephalus 

 latus Brems. 



Man, Dog, ? Cat 



Unknown 

 Unknown 

 Unknown 



Plerocercoid, i.e. rT) , .-, n , T 



i;j i' + | Probably first enters an Inver- 



solid, elongate . v / i 1 i 



i,. ,;+i tebrate host, which is eaten 

 larva, with no , 1V1 ' , ^ 

 bladder ^ by llke ' Perch > Trout, etc. 



Structure and Development of Cestoda. 1 Of the unseg- 

 mented Cestodes, Caryophyllaeus mutabilis, from the intestine of 

 carp and other Cyprinoid fishes, is the most easily accessible form. 



Fig. 40. A, Stickle- 

 back (Gasterosteus 

 aculeatus) infested 

 by an advanced 

 larva of Schisto- 

 cephalus solidus 

 Crepl. B, The 

 larva. All x H. 

 (From specimens 

 in the Cambridge 

 University Mu- 

 seum. ) 



Triaenophorus nodulosus, which is very useful for the study of the 

 excretory system, occurs mature in the pike. In the body-cavity of 

 the Stickleback (Fig. 40) a large, broad, yellow worm may sometimes 



1 Moniez, "Sur les Cysticerques," Paris, 1880; Id. "Sur les Cestodes," 1881 ;; 

 Zschokke, " Recherches sur la structure anatomique et histologique d. Cestodes," 

 Geneve, 1888. 



