. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 23 Morphology.—Amidostomum (p. 19) : Body slender, faintly red with transverse striations. No lateral alae; postcervical papillae very small, subsymmetrical; excretory pore ventral, between nerve ring and postcervical papillae. Buccal cavity (lig. 20) 7 to 8fi deep and 10/i. wide, with very thick walls, and with a large tri- angular dorsal tooth having a wide base and a sharp tip which turns dorsad. There are 4 small sessile cephalic papillae. No pharynx. The cylindrical esophagus is armed with 3 axial triturating
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 23 Morphology.—Amidostomum (p. 19) : Body slender, faintly red with transverse striations. No lateral alae; postcervical papillae very small, subsymmetrical; excretory pore ventral, between nerve ring and postcervical papillae. Buccal cavity (lig. 20) 7 to 8fi deep and 10/i. wide, with very thick walls, and with a large tri- angular dorsal tooth having a wide base and a sharp tip which turns dorsad. There are 4 small sessile cephalic papillae. No pharynx. The cylindrical esophagus is armed with 3 axial triturating lamellae and is in relation posteriorly with an unarmed bulb of the same width, not differentiated externally, which is without masticatory ap- paratus. Nerve ring at middle of esophagus. •Male to 8 mm. long by 80^ wide, and terminating in an un- cinate tail concave ventrally. Esophagus and bulb 63C/x Figs. 20-23.—20, Amidostomum chevkicuxi. Anteiuor end. a, Dorsal view ; b, LATERAL VIEW. 21, SAME. MALE BURSA. 22, SAME. OUTLINE OF BURSA; LATERAL view. Nos. 20-22 after Seurat, 1918. 23, Amidostomum monodon. Anterior end. Linstow, 1882 Bursa (figs. 21 and 22) with 2 large lateral lobes, 105/* long, with their free borders folded towards the ventral surface, and with a dor- sal lobe which is not distinctly delimited. The externo-dorsal ray originates from the dorsal stem, but its relations otherwise are with the lateral lobes and the rays other than the dorsal; it is short, as is the externo-lateral ray; all other rays extend to the bursa margin ex- cept the latero-ventral which extends almost to the bursa margin. A pair of large sessile papillae, contiguous or almost so, on the poste- rior margin of the cloacal aperture. Prebursal papillae subsymmet- rical and briefly pedunculated. Spicules 120^ long, each cleft dis- tally for half its length into 2 unequal branches. Telamon (gor- geret) straight, falciform, G0/x long. Female mm. long by 120/x wide,
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