45 2 ELERY RONALD BECKER. 



The chromatin beading on the nuclear membrane collects into 

 thick, elongated, deeply-staining blobs. Dobell (1919) also 

 figures nuclear degeneration in parasitized Endolimax nana. 



SUMMARY. 



1. Endamoeba citelli sp. nov. is a commensal in the coecum of 

 the striped ground squirrel, Citellus tridecemlineatus . 



2. The nucleus of the free form is typical of the genus Enda- 

 mosba. 



3. The cyst is characterized by a nuclear structure somewhat 

 different from that known for other amoebae, and an unusually 

 thick cyst wall with a yellowish refraction. 



4. The cytoplasm of this amceba may contain a cytridine 

 parasite, Sphxrita endamoebx sp. nov. 



5. The developmental cycle of this cytozoic parasite was 

 followed from the free bacterium-like infective stage to the spore 

 liberated from the sporangium inside the cytoplasm of the 

 amceba. 



6. Sphxrita endamcebx, like other members of the genus, 

 produces degenerative changes in the protoplasm of its host, 

 particularly in the nucleus. 



LITERATURE CITED. 

 Becker, E. R. 



'22 Transmission Experiments on the Specificity of Herpetomonas inusccR- 



domesticoB in Muscoid Flies. Jour. Paras. 10: 25-34. 

 Chatton, E., and Brodsky, A. 



"09 Le parasitisme d'une Cytridinee du genre Spluerita Dangeard chez Amoeba 



Umax Dujard. Arc. f. Prot. 17: 1-18. 

 Dangeard, P. A. 



"86 Recherches sur les organismes inferieurs. Ann. Sci. Nat. Botanique 4 (VI I e 



Serie): 241-341. 

 Dangeard, P. A. 



'95 Memoire sur les parasites du noyau et du protoplasma. Le Botaniste 4: 



199-249. 

 Dobell, C. 



'19 The Amoebae Living in Man. London. 155 pp. 

 Hegner, R. W., and Taliaferro, W. H. 



'24 Human Protozoology. New York. 

 Kessel, J. F. 



'24 The Distinguishing Characteristics of the Parasitic Amceba? of Culture 



Rats and Mice. Univ. Cal. Publ. Zool. 20: 489-544. 

 Kofoid, C. A., Swezy, O., and Kessel, J. F. 



'23 On the Genus Councilmania, Budding Intestinal Amoebae Parasitic in Man 

 and Rodents. Univ. Cal. Publ. Zool. 20: 431-445. 



