. Bulletin - United States National Museum. Science. 144 BULLETIN 140, UNITED STATES NATIONAL MUSEUM Hosts.—Aegoltus otus, A. brachyotus, Bubo maxim/us, B. virgiud- ahus, Falco pygargus, Flammea flammea, Nyctale tengmalmi, Otus brachyotus, O. vulgaris, Strix aluco, S. bubo, & -flammea, S. nivea, S. noctua, S. stridula, Syrnia nyctea, S. aluco, Ulula aluco. Location.—Intestine. Morphology.—Porrocaecum (p. 135) : Large lips (fig. 211) six- skied, with dentate band anteriorly and the pulp with digitiform projections; each lip with 2 papillae. Interlabia sharply pointed. Male up to 48 mm. long
. Bulletin - United States National Museum. Science. 144 BULLETIN 140, UNITED STATES NATIONAL MUSEUM Hosts.—Aegoltus otus, A. brachyotus, Bubo maxim/us, B. virgiud- ahus, Falco pygargus, Flammea flammea, Nyctale tengmalmi, Otus brachyotus, O. vulgaris, Strix aluco, S. bubo, & -flammea, S. nivea, S. noctua, S. stridula, Syrnia nyctea, S. aluco, Ulula aluco. Location.—Intestine. Morphology.—Porrocaecum (p. 135) : Large lips (fig. 211) six- skied, with dentate band anteriorly and the pulp with digitiform projections; each lip with 2 papillae. Interlabia sharply pointed. Male up to 48 mm. long by mm. wide. Tail (fig. 213) with a conical appendage with 2 pairs of papillae; slightly posterior to the cloacal aperture 1 pair of double papillae. Six pairs of preanal papillae, 4 of which form a group about halfway between the other, most anterior, 2 pairs and the cloacal aperture. Spicules sickle- Figs. 211-213.—Porrocaecum spiralb. 211, Dorsal lip. Male tail. After Linstow, 1875 212, Egg. 213, Female up to 64 mm. long by mm. wide. Vulva slightly pos- terior to middle of body, dividing body length in ratio of 8:7. Eggs (fig. 212) elliptical, 102/* long by 60/* wide, with double shell, the outer thickened at the ends and with small glittering prominences. Life history.—Unknown. Distribution.—Europe. This species has been listed by several authors as a synonym of Porrocaecum depressum but Linstow (1875) compared the two and stated they were distinct species. The descriptions show the caudal papillae of male and position of vulva of female to differ in the two species. PORROCAECUM HETEROURA (Creplin, 1829 emend. Mehlis, 1831) Baylis, 1920b Synonyms.—Ascaris heteriira Creplin, 1829; Asearis heteroura Mehlis, 1831. Hosts.—Gharadrius morinellus, C. oedicnenius, C. pluvialis, Himantopus melanopterus, Squatarola helvetica, Sturnus vulgaris, Turdus musicus. Location —Intestine. Morphology.—Powocaecum (p. 135) : Body 14 to 30 mm. long, thick, wi
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