82 University of California Publications in Zoology [Vol. 18 



tera are here found in the pyloric expansion of the mid-gut. This 

 may be due in part to the presence of the intestinal gland and in 

 part to certain chemical or physiological conditions within the several 

 parts of the digestive tract. The investigation thus far indicates 

 that probably only resistant spore forms succeed in reaching the 

 rectum through the intestine. However by means of pressure upon 

 the abdomen some of the contents of the pyloric expansion can be 

 forced through the intestine and ejected through the anal opening 

 along with the rectal contents. These contents from the pyloric 

 expansion are usually swarming with free, flagellated parasites. 



Life Cycle of C. euryophthalmi 



In the life cycle of C. euryophthalmi in Euryophthalmus convivus 

 there are present the following types in the stomach proper which is 

 made up of three parts, the crop, the mid-stomach and the pyloric 

 expansion. It must also be emphasized that the whole life cycle 

 of this flagellate occurs in the several parts of the stomach. 



(1) Oval spore forms (fig. 2) in the initial infective stages in 

 the crop. 



(2) Developing crithidial stages from the non-flagellates (fig. 2, 

 4-5) present in the crop, which migrate posteriorly into the mid- 

 stomach and pyloric expansion. 



(3) Multiple fission forms, probably of two types (a) a somatella 

 (figs. 8, 9) ; (&) a modified type designated as internal budding (fig. 

 12). These have been found only in the crop. 



(4) Binary fission forms in the crop (fig. 7), and in the pyloric 

 expansion (fig. 24). 



(5) Crithidial stages from the crop, which become free forms in 

 the mid-stomach and pyloric expansion, called nectanionads (Minchin 

 and Thomson's terminology', 1915). 



(6) Crithidial stages from the crop, which become attached forms 

 in the mid-stomach (fig. 13) and pyloric expansion (figs. 21-23), 

 termed haptom,onads. 



(7) Final spore stages are found in both the mid-stomach and 

 the pyloric expansion. Some of these succeed in reaching the rectum 

 through the intestine. The staining capacity of these indicate that 

 they probably become more resistant to destructive agencies by form- 

 ing a protective covering. 



