. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 61 to cloacal aperture and 1 at side of sucker). Cloacal aperture promi- nent, the sucker, which is also prominent, 194/a anterior to it. Johns- ton's description of the spicules is confusing. He states: " The spicules are mm. in length and mm. in breadth. The longer male spicule is strongly curved, and has a fairly uniform breadth ( mm.), but tapers slightly toward the extremity. The length is mm. The shorter spicule has a length of mm., and a breadth (in its mid-region) of mm
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 61 to cloacal aperture and 1 at side of sucker). Cloacal aperture promi- nent, the sucker, which is also prominent, 194/a anterior to it. Johns- ton's description of the spicules is confusing. He states: " The spicules are mm. in length and mm. in breadth. The longer male spicule is strongly curved, and has a fairly uniform breadth ( mm.), but tapers slightly toward the extremity. The length is mm. The shorter spicule has a length of mm., and a breadth (in its mid-region) of mm., but the ex- tremity is widened and ; The spicule which Johnston figures agrees with the first length given, being about mm. long. Female mm. long by 260/* wide. Vulva just posterior to middle of body ( mm. from anterior end). Anus 530/* from posterior end. Eggs in uterus embryonated. Life history.—Probably similar to that of H. gallinae (p. 54). Distribution.—Australia (Sydney).. Figs. 70-82.—79, Heterakis caudata. Male tail. After Linstow, 1906. 80, Hetekakis chenonettak. Male tail. After Johnston, 1!>12. 81, Hetera- kis OIRCUMVALLATA. MALE TAIL. AFTER LlXSTOW, 190G. 82, HETERAKIS dispar. Male tail. After Railliet, 1893 HETERAKIS CIRCUMVALLATA Linstow, 1906 Host.—Cygnus atratus, black swan, a species from Australia; not Cygnus olor. Gedoelst lists this worm from G. olor, but it is doubt- ful if it has ever been correctly reported from this host. Location.—Cecum. Morphology.—Heterakis (p. 50) : Head with 3 hemispherical lips. Esophagus short, with terminal bulb: intestine at origin wider than Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonia
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