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 1.5 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- 

 shaped. 



Figs. 211-213. — Porrocaecum spiralb. 211, Dorsal lip. 

 Male tail. After Linstow, 1875 



212, Egg. 213, 



Female up to 64 mm. long by 1.7 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, without lateral alae. Lips large (fig. 214) . 



