682 



FAMILY: DINENYMPHID^ 



however, was the presence on one face of the anterior region of the body 

 of a circular depressed area, which resembled in some respects the 

 sucking disc of species of Giardia. There is a single species, Cochlosoma 

 anatis, which occurs in the intestine of ducks. The large forms measured 

 10 to 12 microns by 6 to 7 microns, while smaller forms were 5 to 9 microns 

 by 3 to 6 microns. The flagella, which ap- 

 peared to vary in number, but of which there 

 were usually about six, were directed back- 

 wards over the body. 



10. Family: DINENYMPHID^ Grassi, 1911. 

 Amongst the numerous remarkable para- 

 sitic flagellates which occur in termites is a 

 form which was placed in a separate family, 

 the Dinenymphidse, by Grassi to include 

 Dinenympha gracilis Leidy, 1877 (Fig. 285). 

 There is a single nucleus, a structure like 

 an axostyle, and several flagella. The last 

 arise from the anterior end of the body, are 

 all directed backwards, and are attached to 

 ridges producing an appearance of a series 

 of undulating membranes which take a spiral 

 course over the body. This flagellate evidently 

 has affinities with Trichomonas, and forms 

 a connecting link with the Polymonadida. 

 Koidzumi (1921), who has named a number 

 of new species, believes that the structure 

 resembling the axostyle is in reality an 

 elongate blepharoplast for the numerous 

 flagella, as he could detect no separate 



blepharoplasts in the forms he examined. Comes (1912) believes that 



D. gracilis reproduces by multiple segmentation. . 



2. Order : HYPERMASTIG-IDA. 

 This order ( = Hypermastigina Grassi, 1911) includes a number of very 

 complicated flagellates which are parasitic chiefly in the intestine of white 

 ants (termites). There is a single nucleus and numerous flagella which arise 

 from as many blepharoplasts. Axostyles and parabasal bodies may be 

 present. Lophomonas hlattarum Stein, 1860, occurs in the intestine of the 

 cockroach. It is pear-shaped and possesses a single nucleus, in front of 

 which are two groups of blepharoplasts, from each of which axonemes, giving 

 rise to a tuft of flagella, orginate. An axostyle passes backwards from the 



Fig. 285. — Dinenympha gra- 

 cilis FROM THE Intestine 

 OF Termes lucifugus 

 (x 1,000). (After 



ZULUETA, 1915.) 



The flagellate possesses a single 

 axostyle and nucleus, and a 

 series of spirally arranged mem - 

 branes with attached flagella. 



