44 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 89 



1917b. The mononchs (Mononchus Bastian, 1866). A genus of free-liv- 

 ing predatory nematodes. Contributions to a science of Hema- 

 tology, 6. Soil Science, Rutgers College, vol. 3, no. 5, pp. 431- 

 486, 71 figs., May. 



1917b. Reprint, pp. 129-184, 71 figs. 



1918. Filter-bed nemas: Nematodes of the slow sand filter-beds of 

 American cities. (Including new genera and species.) With 

 notes on hermaphroditism and parthenogenesis. Contributions 

 to a science of nematology, 7, pp. 189-212, figs. 1-9. Baltimore, 

 Jan. II. 



1919a. Tetradonema plicans no v. gen. et spec, representing a new family, 

 Tetradonematidae as now found parasitic in larvae of the 

 midge-insect Sciara coprophila Lintner. Journ. Parasitol., vol. 

 5, no. 4, pp. 176-185, figs. 1-8, June 25. 



1919b. The orders and classes of nemas. Contributions to a science of 

 nematology, 8, pp. 213-216. Baltimore, July 19. 



1920. One hundred new nemas. (Type species of 100 new genera.) 



Contributions to a science of nematology, 9, pp. 217-343, figs, i- 

 ii8c. Baltimore, Nov. i. 



1921. Howardula benigna ; a nema parasite of the cucumber-beetle. Sci- 



ence, new ser., vol. 54, no. 1409, pp. 667-670, figs. 1-4, Dec. 30. 

 1921. Idem. Contributions to a science of nematology, 10, pp. 1-4, figs. 



1-4. (Rev. and completed ed., pp. 345-352, figs. 1-8, 1928.) 

 1921. Marionella (Eurystoma Marion, 1870) ; an emendation, with notes 



on a new birefringent substance, marionellin, found in the intes- 

 tinal cells. Contributions to a science of nematology, 11. Journ. 



Washington Acad. Sci., vol. 11, no. 21, pp. 504-509, Dec. 19. 

 I922(?)a. Idem. Contributions to a science of nematology, 11, pp. 353- 



358. 

 1922b. Greeffiella (Trichoderma Greeff, 1869; not Trichoderma Steph., 



1835). Contributions to a science of nematology, 12. Journ. 



Washington Acad. Sci., vol. 12, no. 13, pp. 299-303, figs. 1-3, 



July 19. 

 1922b. Idem. Reprint, pp. 359-362, figs. 1-3. 

 1922c. A new species of Nygolaimus, an outstanding genus of the Dory- 



laimidae. Journ. Washington Acad. Sci., vol. 12, no. 18, pp. 



416-421, figs. 1-2, Nov. 4. 

 1924a. Neodiplogaster tropica n. g. (?), n. sp. Journ. Parasitol., vol. 11, 



no. 2, p. 105, fig. D, Dec. 

 1924b. Amended characterization of the nemic genera Cephalobus and 



Acrobeles. Ibid., vol. 11, no. 2, p. 108, Dec. 

 1924c. Food of rhabdites and their relatives, with descriptions of two 



new rhabdites and a new rhabditoid genus. Ibid., vol. 11, no. 2, 



pp. 116-117, figs. K-M, Dec. 

 I924d. The amphids of Caconema (nom. nov.) and of other nemas. Ibid., 



vol. II, no. 2, pp. 1 18-120, fig. N, Dec. 



1925. A new mermithid infecting another nema. Ibid., vol. II, pp. 217- 



218. 



1926. The species of Mermis. A group of very remarkable nemas infect- 



ing insects. Ibid., vol. 12, no. i, pp. 66-72, i pi., i fig. 



