NEMATODA 



623 



Life-History. — Sometimes the life-history is fairly simple, or is 

 supposed to be so, for it is possible that we are not well acquainted 

 with details. 



Other life-histories are most complicated, and must be dealt with 

 in detail. 



Pathogenicity. — Some of the worms are markedly pathogenic, 

 while others usually produce but slight effects. 



Classification. — -The Nematoda are classified into — ^The Non- 

 Bursata, comprising the famihes: (i) Enoplidae, (2) Anguilluhdae, 

 (3) Angiostomid^, (4) Gnathostomidae, (5) Physalopteridse, (6) Fila- 

 riidas, (7) Dracuncuhdse, (8) Mermithidae, (9) Ascaridae, and (10) 

 Oxyuridae; and the Bursata, which are subdivided into the Stron- 

 gyles, composing the families (11) Strongylidae, (12) Metastrongy- 

 lidae, (13) Trichostrongylidae, (14) Ancylostomidae, and the Pseudo- 

 strongyles, comprising the families (15) Eustrongylidae, (16) Trichi- 

 nellidae, and (17) Trichosomidae. 



The Enoplidae are free-living, and do not concern us. 



The following table gives the parasites known in man, excluding 

 a number of doubtful Filariidae : — 



Division. 



Family. 



Anguillulidaa . 



Angiostomidae . 

 Gnathostomidae 



Genus. 



f Anguillula 

 I Anguillulina 

 ^1 Rhabditis 

 \ Leptodera 

 Strongyloides 

 Gnathostoma 



Physalopteridae Physaloptera 



Filaria 



Filariidae 



Dracunculidae 



Ascaridae 



Oxyuridae 

 Eustrongylididae 



Trichosomidse . . 



(Microfilaria) 



(Agamofilaria) . . -i 



[ 17- 



Acanthocheilonema 18. 



Dirofilaria . . 19. 



Loa . . . . 20. 



Haniularia . . 21. 



Onchocerca . . 22. 



Dracunculus . . 23. 



r24. 



Ascaris . . . . 25. 



( 26. 



Toxascaris . . 27. 



Belascaris . . 28. 



Lagocheilascaris 29. 



Oxyuris . . . . 30. 

 Dioctophyme . . 31. 

 Trichinella . . 32. 

 TrichiLiris . . -i-i. 



Species. 



A. aceti. 



A. putrefaciens. 



R. niellyi. 



L. pellio. 



S. intestinalis. 



G. spinigerum. 

 P. caucasica. 

 P. mordens. 

 F. bancrofti. 

 F. ozzarJi. 

 (F. inermis.) 

 (M). powelli. 



(M.) philippinensis. 

 (Agm.) conjunctivae. 

 (Agm.) labialis. 

 (Agm.) oculi. 

 (Agm.) georgiana. 

 A. perstans. 

 D. magalhaesi. 

 L. loa. 



H. equi. 



O. volvulus. 

 D. medinensis. 

 A. lumbricoides. 



A. maritima. 

 (A. texana.) 

 T. canis. 



B. mystax. 

 L. minor. 



O. vermicularis. 

 D. renale. 

 T. spiralis. 

 T. trichiura. 



