1919] Kofoid-Swezij: Trichomitus termitidis 37 



SUMMARY 



1. Trichomitus termitidis sp. nov. occurs in the intestinal tract of 

 Tcrnwpsis angusticollis. It is apparently not pathological to its host, 

 is never attached to the wall and feeds on the debris of the intestinal 

 contents. 



2. It has a higlily developed neuromotor system with parabasal 

 body, undulating membrane, centroblepharoplast and flagella attached 

 by a rhizoplast to the nucleus. 



3. Binary fission occurs frequently. Mitosis is marked by the de- 

 velopment of a large paradesmose following the separation of the 

 centrosome from the blepharoplast. One .schizont retains the old para- 

 basal body and membrane, while new ones are formed for the other. 



4. Multiple fission results in the formation of an eigbt-zooid soma- 

 tella followed by plasmotomy. 



5. Owing to the great differences in the process of mitosis between 

 Trichomitus parvus and the new species, T. termitidis, subgeneric dis- 

 tinction is given to the latter, as we assign it to the new subgenus 

 Trich om,itopsis. 



ZooJoffical Laboratory, University of California, 

 Berkeley, California. 

 Transmitted September 6, 1918. 



LITERATURE CITED 



KOFOID, C. A. 



1917. The biological and medical significance of the intestinal flagellates. 

 Proc. Second Pan Amer. Sci. Cong., 1915-16, 10, 546-56.J. 



KoFoiD, C. A., and Christiansen, E. B. 



1915. On binary and multiple fission in Giardia muris (Grassi). Univ. Calif. 

 Publ. Zool., 16, 30-54, pis. 5-8, 1 fig. in text. 



KoroiD, C. A., and Swezy, O. 



1915. Mitosis and multiple fission in trichomonad flagellates. Proc. Amer. 

 Acad. Arts Sci., 51, 289-378, pis. 1-8, 7 figs, in text. 

 Swezy, O. 



1915a. Binary and multiple fission in Eexamitux. Univ. Calif. Publ. Zool., 



16, 71-88, pis. 9-11. 

 1915b. On a new trichomonad flagellate, Trichomitus parvus, from the intes- 

 tine of amphibians. Ibid., 16, 89-94, pi. 12. 



