. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 321 of the esophagus, dividing the body length in the ratio of 1:45. Eggs 23/a by 16/z, very numerous. Life Mstory.—Unknown; probably involves intermediate stages in other hosts. Distribution.—Bismarck Archipelago. Genus OXYSPIRURA Drasche in Stossich, 1897 Generic diagnosis.—Thelaziidae (p. 311) : Mouth without lips, sur- rounded by 2 lateral and 4 submedian cephalic papillae. A short. Figs. 384-385.—384, Ceratospira vesiculosa. Male tail. After Schneider, 1866. 385, Ceratospira ophthalmica. a, Head end; b, male
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 321 of the esophagus, dividing the body length in the ratio of 1:45. Eggs 23/a by 16/z, very numerous. Life Mstory.—Unknown; probably involves intermediate stages in other hosts. Distribution.—Bismarck Archipelago. Genus OXYSPIRURA Drasche in Stossich, 1897 Generic diagnosis.—Thelaziidae (p. 311) : Mouth without lips, sur- rounded by 2 lateral and 4 submedian cephalic papillae. A short. Figs. 384-385.—384, Ceratospira vesiculosa. Male tail. After Schneider, 1866. 385, Ceratospira ophthalmica. a, Head end; b, male tail. After , 1898 buccal cavity or pharynx present. Membranous alae on head gener- ally lacking. Tail very slender, acutely pointed. Male with tail curled or in spiral, without caudal alae; caudal papillae present, sessile, the preanal of very variable number ('2 to 28), the postanal (1 to 8) often asymmetrical. Two unequal spicules, one long and filiform, the other short and thick. Female with straight tail. Vulva in posterior part of body, a short distance anterior to the anus. Parasitic under nictitating membrane in birds. Type species.—Oxyspieura cepfmloptem (Molin, L860) Stossich, 1897. KEY TO SPECIES en' ciXVSI'IRI' 1. Head with cuticular expansions, at least in the female 2. Head without cuticular expansions, or none described, or inconstant (in O. parvovion sometimes present in male) 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 : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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