220 TRICHOCEPHALUS DISPAR. 



cctozoa ; while others originate from ova in the various textures 

 and cavities of the body, and are denominated entozoa. The origin 

 of intestinal worms and all other entozoa, has long been involved 

 in great obscurity ; it is, however, now ascertained not only that 

 the greater part produce ova or living young, but many have sepa- 

 rate sexes, and couple as ordinary animals.* 



Div. I. — JVorms which inhabit the intestinal canal. 



TRICHOCEPHALUS DISPAR, 



The Long Thread-JVomi. 



Pl. XXIX. fig. 1,2. 



Order Nematoidea, Rudolphi. 



Gen. Char. Body round, clastic, the posterior part 

 thick and clavated ; the anterior capillary sometimes 

 with a knob at the end ; mouth orbicular ; penis of 

 the male simple, inclosed in a sheath. 



* Consult Rcdi, de Animalcu lis Vivis quce in corporibus Animalium Viiorum 

 reperiunlur, 1708. Latrcille, Fam. Nat. du Regne Animal, 1805. Clerc, Hist. 

 Nat. el Med. Latorum Lutnbricorum, Geneva, 1715. J. A. Goeze, Versucheiner 

 Naturzeschichte der Eingeweidewurmer Thierischer Kbrper, Blackenburg, 4to. 

 1782. Pallas, Diss. Inaug. de Infestis Vivenlibus Viventia, Lug. Bat. 17G0. 

 Bloch, Abhandlung von der Enzegung der Eingeiccideurmer, und dein Mitllen 

 wider Diselben, Berlin, 4to. 1782. Zeeder, Systema Entozoorum, 1800. Werner, 

 Inlestinalium presertim Teniae Humana:, brevis expositio, 4 vol. 8vo. Leipsic, 1782, 

 1788. Modeer, Bibliotheca Helminlhnlogica, Erlang-. 1786. M uller, O. F. Von 

 Wermern des Sussen und Salzingen Wassers, 4to. Copenhagen, 1771. Bruguiere, 

 in the art. Vers, in the Ency. Methodique. C A. Rudolphi, Entozoorum, sive 

 Verm. Intest. Hist. Nat. 1808; and Entozoorum Synopsis, Berol. 1819. Bremser, 

 Traite Zoologique et Physiologique sur les Vers Intestinaux, par M. de Blain- 

 ville, 8vo. Paris, 1824 ; and Icones Helminlhum, fol. Vienna, 1824. Rhind, Trea- 

 tise on the Nature and Cure of Intestinal Worms. Hooper, in the Memoirs of 

 tht London Medical Society, vol. vi. 



