192 



PROCEEDIYGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



Female 17.5 to 21.6 mm. long with a maximum thickness of 154 [x. 

 Anterior extremity attenuate and provided with large cuticular 

 bosses (fig. 250). Posterior extremity bent and abruptly attenuated. 

 The anus is near the posterior extremity of the body (fig. 251) . The 

 vulva is in the posterior portion of the body but at some distance 

 from the anus. Eggs elliptical, 45 

 IX long and 22 to 23 [x thick. 



Host. — Mus musculvs. 



Location. — Liver and on exter- 

 nal walls of stomach. 



Locality. — ^Austria. 



Dujardin (1845) notes a speci- 



248. 249. 250. 251. 



Figs. 218-251.— Gongylonema musculi. 248, Anterior extremity of male. Enlarged. After 

 MoLiN,1857. 249, Posterior extremity OF MALE. Enlarged. After Molin, 1S57. 250, Anterior 

 extremity of female. enlarged. after molin, 1857. 251, posterior extremity of female 

 Enlarged. After Molin, 1857. 



men from Vienna, from which the maximum length and the thickness 

 noted above are taken, as having tAvo cervical alae. This would sug- 

 gest that he was not dealing with Gongylonema. This species, the 

 type of the genus, is unfortunately not very well Imown. Dujardin 

 states that only 2 mice were found infested in 1,264 examined. 



