190 CLASS . Vv. 
Genera Pseudalius Dusarp., Sclerostoma Dus., Stenwrus Dusarn. 
Sp. Strongyl. inflexus, Stenurus inflexus Dus. ; found by W. VROLIK in large 
numbers in the pulmonary arteries and veins of the Delphinus phocena. 
See Biydragen tot de natwurk., Wetensch. 1. 1826, bl. 77—84. 
Stephanurus DIESING. 
Spiroptera Rup. (and Physaloptera Rup.) Body attenuated an- 
teriorly or at both ends. Mouth orbicular, sometimes surrounded 
by papille. 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 cesophagus or of the stomach. Sp. Spiroptera strongylina 
Rup., Bremser Icon. Helminth. Tab. 1. figs. 1518, in the wild and tame 
hog ;—Spiropt. strumosa, Ascaris strumosa FRG@LICH, Naturforscher XXv. 
Tab. m1. fig. 15, C. L. Nirzscu Spiroptere strumos. Descriptio. Hale, 1829. 
4to, cum Tabula; in the stomach of the mole, &c. 
Dispharagus Dus. (Species of Spiroptera Rup.) Head terminated ‘ 
by two papille surrounding the mouth. 
Sp. Spiropt. cystidicola Ruv., Cystidicola G. FiscHuR, REIL’s Archiv, Ut. 
1799. 8. 95—100. Tab. 11.; in the swim-bladder of trout. 
Odontobius RoussEL DE VAUZEME. (Is this its place ?) 
Ascaris L. (in part), Rup. (Ascar?s and Heterakis Dus.) 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 lumbricoides L., A. VALISNIERI Opere fisico-mediche, Venezia, 
1733, I. pp. 271—282. Tab. 34, 35, Bremser Ueb. leb. Wiirmer, Tab. 1. 
figs. 1317, Icon. Helm. Tab. Iv. figs. 10, 11 ; 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 CLoQquET and GuRLI, differs 
from it (Ascaris megalocephala). Also the round-worm which occurs in the 
swine, is, according to DusaRDIN, specifically different (Ascaris suilla Dus.) 
Comp. on the structure of the round-worm the work of CLOQUET indicated 
above. 
Oxyuris Rup., Brems. 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.) 
