322 ANIMAL PARASITES. 



get Trichina spiralis into its place, we have consequently three 

 things to do. 



Can we undertake such an arrangement — 1, by a strict exami- 

 nation of the anatomical '-peculiarities in the structure of the 

 ■worms to be compared; 2, supported upon the administration of 

 the living, encysted round-worms in question to different animals ; 

 and 3, supported upon a similar administration of the mature 

 eggs of certain rouud-worms. In the present attempt at 

 arranging the Trichina with the Trichocephali, I have laid 

 this triple course clearly before me, and followed the first 

 and second of the paths indicated, but have been obliged to 

 omit the third from want of material. As we shall see further 

 on, the administration of Trichina spiralis to dogs led to no 

 result, and I have at present to undertake this arrangement 

 of the Trichina spiralis of Luschka and Owen with Trichocephd- 

 lus dispar only upon the similarity of the anatomical structure. 

 This being done, I must also at once bring together the synonyma 

 of the two forms. 



Synonyms of Trichocephalus dispar (Goeze). — Trichuris 

 (Roederer and Wagler, 1761, 1762; Wrisberg, 1767; Bloch, 

 1782; Lamarck, 1816, who calls the worm Trichure in the 

 French, and Trichocephalus in the Latin text) ; Ascaris (Linne) ; 

 Mastiff odes (Zeder, 1803). 



Synonym of Trichina. — Cysticerci species (Hilton) ; Filaria 

 (of most authors). 



Systematic description of Trichocephalus dispar. — Cutis trans- 

 verse striata, marginales rugas ad anum versus magnitudine ad- 

 ductas exhibens. Caput 002 mill, latum, retractile, obtuso-acumi- 

 natum, inter dum per parvd papilla instructum. Fractus intestinalis 

 constituitur ex cesophago ab initio recto, angustissimo, paullo post 

 toruloso, sensim per totum collum intumescente ; ventriculus pyri- 

 formis, ad latera sua glandulas 2 perparvas aut appendices alosas 

 aut nervorum ganglia gerens. Animalia fcecibus humanis pro 

 nutrimento utentia. Mas : omnino colore clarior, fusco-albior ; 

 circiler 37 mill, longus {caput et collum 22 ; truncus aut abdomen 

 15) ; in trunco 05 mill. — 1-0 mill, latus ; formam spiralem amans. 

 Testis et funiculus spermaticus simplex, ad intestini tenuis formam 

 volutus ; una cum tubo intestinali ante anum in cloacam communem 

 apertus. Penis simplex ; 3*35 mill, longus ; 0*042 mill, ad ex- 

 tremitatem infundibuliformem, 0'027 mill, ad apicem versus latus ; 



