72 JUSTIN M. ANDREWS. 



the majority falling between 12 and 20 micra. As these measure- 

 ments were made from fixed, stained, individuals from partially 

 defaunated hosts, the length measurement was checked by 

 measuring one hundred live individuals from untreated termites. 

 The average length in this series was 30.97 micra, indicating that 

 the treatment has little, if any, effect on size. 



The above measurements, and those mentioned hereafter in the 

 description of organelles, were all made from termites of three 

 colonies which furnished most of the material used in the cyto- 

 logical study. When other colonies (thirteen more) were investi- 

 gated in order to observe the distribution of Trichomonas 

 termopsidis, forms were encountered in twelve of the colonies that 

 differed from those previously studied in size, which varied from 

 50 micra to 150 micra, most of the giant individuals lying between 

 70 micra and 90 micra in length. In all other morphological 

 details, the two sizes of this Trichomonas are identical as far as we 

 are able to observe. So, for the present, we are calling this a size 

 race of Trichomonas termopsidis. It may be that further study 

 will reveal specific differences rather than racial differences. 



CYTOPLASM. 



The cytoplasm, as stated above, is extremely labile; indeed it 

 probably approaches fluidity. The shape is constantly changing, 

 and the body assuming new proportions. Occasionly, in live 

 specimens, one can see the animal slide some of the cytoplasm off 

 the end of the axostyle in drops. The cytoplasm is kept in a 

 state of agitation by the activity of the axostyle, which appears 

 to function as an internal paddle, continually churning up the 

 contents of the body. 



CYTOSTOME. 



The cytostome (Cytos., Fig. 2.) does not appear to be the 

 comma-shaped vent usually pictured for the trichomonads, but 

 extends as a spiral groove starting above the middle on the right- 

 hand side of the animal, becoming more sharply indented as it 

 proceeds ventrally, ending under the nucleus. Although an 

 actual opening cannot be seen, the food particles, and fluid filled 

 vacuoles are more numerous dorsal to the nucleus indicating the 

 position of the opening. 



