554 



XEMATODE PARASITES OF THE DOMESTIC PIGEON', 



again biluroated . Two three-pointed spicules, short and thick, joined by a 

 membrane to form a tube; a star-shaped chitinous piece with four rays, the two 

 lateral rays curved forward, surrounding the spicules when they are protruded. 

 A pair of prebureal papillae. Anterior half of female body tUiform. Vulva in 

 posterior fourth of body. 



Type species, CephalostrongyJus quadriradiatus Stevenson, 1904. 



Cephalostrongylus quadriradiatus Stevenson. 



1904, Strongyliis quadriradiatus, Stevenson, Bur. Anim. Industry, Washing- 

 ton. Circular 47, 10 tig's. — 1905, Neumann-Macqueen, Parasites Dom. Anim., 2nd 

 edit., p. 414. — 1909, Trichustrungylvs qwadriradiaiw, Shipley, Pi'oc. Zool. Soc. 

 London, p. 335. — 1911, Strongrjlwi quadriradiatus, Ransom, Fjoc. U.S. Nat. 

 Mus., xli., p. 363. — 1912. Neveu-Lemaire, Parasif. Anim. Dom., Paris, ))p. 

 718-719. 



The specimens in this collection agree closely with the description given by 

 Stevenson, though tlie dimensions are all somewhat smaller. They were reddish 

 in colour when first collected, and many of the females were spirally coiled, 

 especially towards tlie anterior end, which, being long and filifoi'm, gave them 



Text-figs. 1-3. — Cephalostrongylus quadriradiatus. 

 1. Anterior end. (x 230), 2. Region of genital pore ^^.;>. J of female, showing 

 ovijector (ut.) and oviduct (ovi.) ix 140); 3. Posterior end, female, an., anus. 

 (x322). 



a superficial resemblance to the Tricliiiicllids found with them. The peculiar, 

 four-rayed, chitinous piece connected with I lie siiicules, to which the species owes 

 its name, is just as figured by Stevenson. The vesicular swelling of the cuticle 



