Worms 243 



immature or bladderworm stage which is so destructive to sheep. 

 The whole subject of tape-worms in the Rocky Mountain Region 

 is in a beginning stage, and offers a fine field for research. 



ROUND WORMS 



Dr. Maurice C. Hall, in the work cited above, records very 

 numerous species of parasitic Nematodes, the majority in- 

 habiting the alimentary canal of mammals. The free-living 

 forms, existing in the water and soil, have been observed but 

 hardly studied. In 1916 Hall* published a very important re- 

 vision of the nematode parasites of rodents. Mr. E. R. Warren 

 of Colorado Springs saved for him alcoholic material obtained 

 during his researches on Colorado mammals, and it is mainly 

 due to him that the following were described and recorded from 

 our State; Irichuris fossor Hall (new) in Thomomys fossor; 

 Heteroxynema cucullatum Hall (new genus and species) in Euta- 

 mias operarius; Oxyuris obvelata Rudolphi in Neotoma mexicana 

 fallax; 0. tetraptera Nitzsch in mice; 0. triradiata Hall (new) in 

 spermophiles; Dermatoxys veligera Rudolphi in rabbits; Ransomus 

 rodentorum Hall (new genus and species) in Thomomys fossor; 

 Trichostrongylus delicatus Hall (new) in Abert's squirrel, Nema- 

 todirus neotoma Hall (new) in Neotoma; Citellinema bifurcatum 

 Hall (new) in Citcllus elegans; Warrenius quadrivittati Hall (new 

 genus and species) in Eutamias quadrivittatus; Heligmosomum 

 vexillatum Hall (new) in Thomomys fossor; Rictularia coloradensis 

 Hall (new) in Eutamias quadrivittatus; Protospirura muris Gmelin 

 in mice and rats. These names naturally mean little to anyone 

 but a helminthologist, but they are given to show the abundance 

 of these worms, and the excellent opportunities for discovery of 

 new forms. The disease called trichinosis, due to the presence 

 in the muscles of the worm Trichinella spiralis of Owen, has been 

 observed in Boulder. Man gets it by eating insufficiently cooked 

 pork, in which the cysts of the parasite may not rarely be found. 

 With proper inspection of meat, and adequate cooking, this 

 disease will be abolished. 



Cobb in 1914 described a free-living freshwater nematode, 

 Ironus americanus, from Deer Bottom in the Pike's Peak region. 



*Proc. U. S. National Museum, vol. 50, pp. 1-258. 



