504 On some Parasitic Nematodes. 
A. sturni, it seems advisable to retain the well-known name 
ensicaudatum. P. heteroura (Creplin, 1829) is in all 
probability a synonym of P, semiteres (Zeder, 1800), and not 
a distinct species, 
Fig. 8. 
Porrocecum ensicaudatum. Tail of male; ventral view, showing 
postanal papille. 
REFERENCES. 
Bayuis, H. A. 1920. “ On the Classification of the Asc . The 
Systematic Value of certain Characters of the Alimentary Canal.” 
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BATE EAC. 1916. “ Nematode Parasites of Mammals of the Orders 
Rodentia, Lagomorpha, and Hyracoidea.” Proce. U.S. Nat. Mus. 
apse 
Linstow, O. von. 1884. “ Helminthologisches.” Arch. f. Naturg. 1. 
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——. 1899. “Nematoden aus der Berliner zoologischen Sammlung,” 
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——. 1909. ‘ Parasitische Nematoden,” in Brauer, ‘ Die Siisswasser- 
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Sampon, L. W. 19074. Abstr. Proc. Zool. Soc. (March 26) p. 15. 
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ScunempER, A. 1866. ‘Monographie der Nematoden,’ Berlin. 
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