38 GUIDE TO THE STUDY 



References 



Martin, H. M., 1926. Studies on the Ascaris lumbricoides. Univ. Nebr. 



Agr. Exp. Sta., Research Bull. 37, 78 pp. 

 May, H. G., 1919. Contributions to the life histories of Gordius robustus 



(Leidy) and Paragordius varius (Leidy). Illinois Biol. Monographs, 5 



(2): 127-238. 

 Ransom, B. H., and W. D. Foster, 1920. Observations on the life history 



of Ascaris lumbricoides. U. S. Dept. Agr., Bull. 817, 47 pp. 

 Van Cleave, H. J., 1919. Acanthocephala from the Illinois River, with 



descriptions of species and a synopsis of the family Neoechinorhyn- 



chidse. Illinois State Natural History Survey Bull., 13 (8): 225-254. 



