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142 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



Morphology. — Porrocaecum, (p. 135) : Body white. Head (fi 

 207) 230 to 300/x wide, with 3 large convex lips each carrying a pa- 

 pilla in the middle of the convexity. Esophagus 2.8 mm. long, 

 followed by a ventriculus from the side of which there arises a short 

 cecum joining with the intestine. Lateral membranes present 

 throughout whole body length, wide near the head and narrow the 

 remainder of the length. Cuticle with very pronounced cross-stria- 

 tions. 



Male 18 to 53 mm. long. Tail slender, conical. Two spicules, 

 wide, slightly curved. 



Female 40 to 63 mm. long by 900 to 1.14 mm. wide. Tail straight, 

 slender; anus 800//, from the posterior end. Vulva situated at 2/5 

 of the length of the body from the head end (22 mm. from cephalic 



Z06. 



207. 



Figs. 205-208.— 205, Porrocaecum reticulatum. Male tail. After Bay- 

 lis and Daubney, 1922. 206, Dorsal lip. After Linstow, 1899. 207, 

 Porrocaecum semiteres. Anterior end (dissected). After Creplin, 

 1829. 208, Porrocaecum serpentulus. Male tail. After Monnig, 1923 



extremity in the large specimens). Ovejector (?) slender, filiform, 

 running anteriorly for 3 mm., then turning and running posteriorly 

 for 4 mm. at which point it divides into 2 parallel branches. Eggs 

 elliptical, 91,u long by 84^. wide, with thick reticulated shell. 



Rife history. — Unknown. 



Distribution. — Europe. 

 Lewis (1926,10) has recently expressed doubt as to the authenti- 

 city of this species ; from a study of specimens he thinks it probably 

 the same as P. ensicaudatum. 



PORROCAECUM SERPENTULUS (Rudolphi, 1809) Baylia. 1920b 



Synonyms. — Ascaris serpentulus Kudolphi, 1809; Ascaris ardeae 

 Froelich, 1802. 



Host*. — Anthropoides virgo, Ardea agami, A. cinerea, A. ccerulea, 

 A. grus, A. major, A. melanocephala, A. nycticorax, A. pileata, A. 

 purpurea, A. scapularis, A. violaeea, Grus australmiana, G. cinerea, 



