368 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



in the bursa and spicules of the male, and by the size of the eggs 

 and position of the vulva of the female, the eggs of T. retortseformis 

 measuring above 75 /j. in length, and the vulva being from 1.75 to 2 

 mm. from the tip of the tail. 



It is perhaps questionable whether T. calcaratus should be included 

 in the genus Trichostrongylus in view of the rather aberrant characters 

 of the dorsal ray of the bursa, and of the spicules. The asymmetrical 

 origin of the dorsal ray and the termination of its branches in undi- 

 vided tips are atypical, as also is the shape of the distal portion of 

 the spicules. For the present, however, it seems better to look upon 

 this nematode as an aberrant species of Trichostrongylus rather than 

 as the single representative of a separate closely related genus. 



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