. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 377 Female 27 10 40 mm. long by 350 to 500/* wide. The vulva is at the posterior end, just anterior to the anus (fig. 437). Eggs 85 to 88/* long by 36 to 40/* wide, oblong, somewhat truncated at the ex- tremities, covered with slightly salient granules or tubercles, com- paratively large and thickly set. Life history.—Unknown. Apparently the worms undergo at least part of their molts in the tissues of the host and may die there, leav- ing their borrows filled with eggs as the worms themselves decom- pose or are ab
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 377 Female 27 10 40 mm. long by 350 to 500/* wide. The vulva is at the posterior end, just anterior to the anus (fig. 437). Eggs 85 to 88/* long by 36 to 40/* wide, oblong, somewhat truncated at the ex- tremities, covered with slightly salient granules or tubercles, com- paratively large and thickly set. Life history.—Unknown. Apparently the worms undergo at least part of their molts in the tissues of the host and may die there, leav- ing their borrows filled with eggs as the worms themselves decom- pose or are absorbed. This habit is somewhat similar to that of Hepaticola hepatica, a hairworm in the liver of rats and not a re- mote relative of Hystrichis. There are probably intermediate larval stages in fish, according to Jaegerskiold. Distribution.—Europe (France, Germany, Italy, Hungary and Ireland).. Fig. 437.—Hystrichis tricolor. Head and tail ends of female. After Jaegerskiold, 1909 HYSTRICHIS ACANTHOCEPIIALICUS Molin, 18Gla Synonym.—Strongylus tubifex Hosts.—Primary: Ibis nudifrons, Phimosus infuscatus; second- ary : Probably fish, according to Jaegerskiold. Ibis tubifex, re- ported as a host in the index-catalogue of Stiles and Hassall, is a lapsus, the generic name of the host (Ibis nudifrom) having been combined with the specific name from the synonym. Location.—Glands of proventriculus. Morphology.—Hystrichis (p. 375) : Swelling of head end (fig. 438 a and b) slight or lacking. Head with 7 to 9 circles of spines, the spines relatively sparce, not closely set, the largest 25 to 30/* long by 15 to 17/* wide. Mouth opening triangular; mouth cavity 130/* long. Male 23 to 15 mm. long; maximum width to 2 mm., width at head end 270 to 200/*, at tail end (just anterior to bursal cup) 1G0/*. Spines on anterior part of body to a distance of 800/i from head end. Esophagus about 8 mm. long. Bursal cup 100/* long by 240/x wide, a round bell-shape, its walls th
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
