GENUS: TREPOMONAS 



713 



The degree of development of the grooves varies considerably. Sometimes 

 each is a narrow slit, while at other times it is wide and gaping. The margins, 

 which are folded over, may be turned back, producing the appearance of 



Fig. 301. — Calonymjiha grassii (x 1,600) from the Intestine of the Termite, 

 Calotermes grassii. (After Janicki, 1915.) 



two large curved lobes one on each side of the posterior region of the body. 

 The inner margin of each groove often appears to be strengthened by a fibre 

 which passes round the 

 posterior end of the 

 body, where a notch 

 sometimes occurs, and 

 has its ends on the ex- 

 tremities of the horse- 

 shoe body. It sometimes 

 appears as if this fibre is 

 an actual continuation 

 of the latter structure. 



Alexeieff (1910) dis- 

 covered a form in the 

 rectum of the marine 

 fish. Box saljKi (Fig. 300). 

 The form he described 

 was evidently a dividing 

 flagellate, and only the 

 two long flagella were 

 depicted. 





Fig. 302. — Htei^hanonym'pha siUestrini (x 1,200) from 

 Intestine of Termite, Calotermes castaneus. 

 (After Janicki, 1915.) 



