190 CLASS V. 



Genera Pseudalius DUJARD., Sclerostoma DUJ., Stenurus DUJARD. 



Sp. Strongyl. inflexus, Stenurus inflexus DUJ. ; found by W. VROLIK in large 

 numbers in the pulmonary arteries and veins of the Delphinus pkoccena. 

 See Bijdragen lot de natuurk. Wetensch. I. 1826. bl. 77 84. 



Stephanurus DlESlNG. 



Spiroptera RUD. (and Physaloptera RUD.) Body attenuated an- 

 teriorly or at both ends. Mouth orbicular, sometimes surrounded 

 by papillae. Tail of male mostly rolled spirally or deflected, sup- 

 plied with a lateral expansion or bladder inferior, not terminal ; tail 

 of female conical, straight. 



Most of the species of this genus live in mammals and birds between 

 the coats of the oesophagus or of the stomach. Sp. Spiroptera strongylina 

 BUD., BREMSER Icon. Helminth. Tab. n. figs. 15 18, in the wild and tame 

 hog; Spiropt. strumosa, Ascaris strumosa FRCELICH, Naturforscher xxv. 

 Tab. in. fig. 15, C. L. NITZSCH Spiropterce strumos. Descriptio. Halse, 1829. 

 4to, cum Tabula ; in the stomach of the mole, &c. 



Dispharagus DUJ. (Species of Spiroptera RUD.) Head terminated 

 by two papillae surrounding the mouth. 



Sp. Spiropt. cystidicola RUD., Cystidicola G. FISCHER, REIL'S Arcliiv. in. 

 1799. s - 95 10 - Tab - n - > in th * swim-bladder of trout. 



Odontobius ROUSSEL DE VAUZEME. (Is this its place ?) 



Ascaris L. (in part), RUD. (Ascaris and Heterakis DUJ.) Body 

 acuminate at each extremity. Head trivalved. Male genital 

 organ a double spiculum. 



Most of the species live in the intestinal canal of vertebrate animals. 

 Sp. Ascaris lumbricoldes L., A. VALISNIERI Opere fisico-mediche, Venezia, 

 T 733> i' PP- 2 7i 282. Tab. 34, 35, BREMSER Ueb. leb. Wilrmer, Tab. i. 

 figs. 13 17, Icon. Helm. Tab. iv. figs. 10, n ; round worm, le lombric, der 

 Spul-wurm, &c. This species lives in the intestinal canal of man, and 

 attains the length of 15 inches ; with this is usually united a similar worm 

 from the horse, which, however, according to CLOQUET and GURLT, differs 

 from it (Ascaris megalocephala). Also the round- worm which occurs in the 

 swine, is, according to DUJARDIN, specifically different (Ascaris suilla DUJ.) 

 Comp. on the structure of the round- worm the work of CLOQUET indicated 

 above. 



Oxyuris RUD., BKEMS. Body cylindrical or fusiform, the pos- 

 terior part in the female attenuate, subulate. Mouth orbicular or 

 triangular. Penis vaginate simple, with a small posterior accessory 

 part. (Small worms, the females much bigger than the males.) 



