NEMATODE PARASITES OF BIRDS 137 



Morphology. — Porrocaecum (p. 135) : Mouth with 3 convex lips. 

 Cuticle with marked transverse striations. Muscular esophagus 

 claviform, followed by a ventriculitis and accompanied by a narrow 

 cecum originating at the base of the intestine and running anteriorly 



Male 12 to 30 mm. long by 500^. to 1.2 mm. wide. Tail slender, 

 conical, mucronate, without lateral alae; cloacal aperture 1/46.4 of 

 total length from posterior end. Two spicules, 52G> long, curved, 

 alate, with rounded points. 



Female 43 to 53 mm. long by 2.2 mm. wide. Tail slender, pointed, 

 straight. Anus about 1/55 of total length from posterior end. 

 Vulva slightly posterior to middle of body, dividing body length in 

 ratio of 13:11. Eggs lOO/i. long, globular. 



Life history. — Unknown. 



Distribution. — Europe (France and Germany). 



PORROCAECUM ANGUSTICOLLE (Molin. 1860) Baylis and Daubney, 1922 



Synonym. — Ascaris angusticollis Molin, 1860. 



Hosts. — Archibuteo (Buteo) lagopus, Buteo buteo (Buteo vul- 

 garis), Circus aeruginosus, Falco hali-aetus, Helotarsus albicilla, H. 

 ecaudatvs, Milvus govinda, Pandion haliaetos, Pernis species (prob- 

 ably P. apivorus) . 



Location. — Intestine. 



Morphology. — Porrocaecum (p. 135) : Dorsal lip (fig. 200) hexag- 

 onal, pulp with 2 lobes rounded anteriorly and joined by a saddle; 

 from the inner surfaces of the lobes 2 projecting plates, flattened 

 and expanded distally. Toward base of lip on each side a cuticular 

 band. A pair of papillae and dentigerous ridges present. Inter- 

 labia small, triangular. Esophagus, including ventriculus, 4.8 mm. 

 long; cecum 2.7 to 3 mm. long. 



Male up to 55 mm. long by 1.1 mm. wide. Tail (fig. 201) conical, 

 390/* long. A distinct constriction halfway from cloacal aperture to 

 tip of tail. Five pairs of postanal papillae, 4 of them in posterior 

 half of tail, the other pair made up of double papillae, not far 

 posterior to cloacal aperture. Spicules equal, 950/x long, not alate. 



Female 40 to 90 mm. long by 500/x to 1.5 mm. wide. Tail 700/x 

 long, blunt ; caudal papillae 200/x from end. Vulva in anterior half 

 of body, dividing body length in ratio of 3:5. Eggs 85 to 93/a 

 long by 58 to 74/x wide. 



Life history. — Unknown. 



Distribution. — Europe (Austria (Vienna Museum)), Africa 

 (Egypt), and Asia (India). 



PORROCAECUM DEPRESSUM (Zeder, 1800) Baylis, 1920b 



Synonyms. — Fusaria depressa Zeder, 1800; Ascaris depressa 

 (Zeder, 1800) Rudolphi, 1809. 



