8 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



to be double. The eggs are numerous and thick shelled, 38/ji to 40/* 

 long by 25fji to 30^ wide. Most of them are in the morula stage, 

 while in those most fully developed the vitelline membrane is shrunken 

 away from the shell, thus concealing the details of the stage of devel- 

 opment reached. No further details could be determined from the 

 fragmentary specimens. 



Hosts. — Primary: Lynx {Lynx rufus calif omicus), puma {Felis 

 hippolestes) \ secondary: Unknown. 



Location. — Lungs. 



Distribution. — United States (Lassen County, Calif., and Las 

 Vegas, N. Mex.) 



Type specimen.— U. S. N. M. Helm. Coll. No 25337. 



Reinarks. — The genus to which Metathelazia is most closely re- 

 lated is Thelazia. The two genera are similar in the following char- 

 acters: The mouth is without lips; a buccal capsule or vestibule is 

 present; the esoj^hagus is moderately short; the tail of the male is 

 recurved and is without caudal alae; cervical serrations are present. 



The genus Metathelazia may be distinguished from the genus The- 

 l<izia by the fact that in the former the vulva is in the posterior 

 region of the body, the si3icules are equal, the preanal papillae are 

 limited to four pairs, the cervical serrations are less conspicuous and 

 fewer in number, and the members of the genus are found in the 

 lungs of mammals. 



BIBLIOGRAPHY 



Danhehm, Bektha L., and Ackebt, James E. 



1929. Ou the anatomy of the nematode Passalurus amhiguus (Rudolphi). 

 Trans. Amer. Micr. Soc., vol. 48, pp. 80-83, January. 

 DuJAEDiN, Felix. 



1845. Histoire naturelle des helminthes ou vers intestinaux. xvi+654+15 

 pp., 12 pis. Paris. 

 Hau., Mattbice 0. 



1916. Nematode parasites of mammals of the orders Rodentia, Lagomorpha, 

 and Hyracoidea. Proc, U, S. Nat. Mus., vol. 50, pp. 1-258, pi. 1, 

 fig. 290, May 13. 

 LiNSTOW, Orro Friedrich Bernhard von. 



1899. Nematoden aus der berliner zoologischen Sammlung. Mitt. a. d. Zool. 

 Samml. d. Mus. f. Naturk in Berlin, vol. 1, no. 2, pp. 3-28, pis. 1-6, 

 figs. 1-78. 

 Rudolphi, Carl Asmund. 



1819. Eutozoorum synopsis eui accedunt mantissa duplex et indices 

 locupletissimi. x+811 pp., 3 pis. Berlin. 

 SoHNBiDEB, Anton. 



1866. Monographic der Nematoden. viii+375 pp., 122 figs., 28 pis., 343 figs. 

 Berlin. 



