POKTER: TEICHONYMPHA. 65 



3. Dinenympha gracilis, 



Plate 6, FIgaies 66-72. 



I have found it almost impossible to draw any sharp line of distinction 

 between Dynenympha and the young of Pyrsonympha ; in fact I doubt 

 very much whether Dinenympha should be considered as anything else 

 than a very early stage of a developing Pyrsonympha. 



Dinenympha never possesses a flagellum or a peduncle, although at the 

 anterior tip of the animal there is frequently a deeply stained body resem- 

 bling the tubercle of Pyrsonympha. The body of Dinenympha is long 

 and slim, slightly flattened on one side, and generally twisted with one or 

 two dexiotropic turns. Piunning parallel with this fwist, but upon the 

 convex side only, there are from seven to nine muscular cords, resem- 

 bling those of Pyrsonympha; but they often cause the surface to project 

 much farther than is usual in Pyrsonympha, giving the animal a fluted 

 appearance. This is shown in Figures 69 and 70 (Plate 6), which repre- 

 sent the upper and lower surfoces respectively of the same individual. 

 Similar views of another individual are shown in Figures 71 and 72. 



The animal is generally almost devoid of cilia, except for a tuft at the 

 posterior end (Figs. 67, 68), or occasionally a few cilia at both extrem- 

 ities (Figs. 66, 69). Sometimes, however, it is thinly ciliated all over 

 (Fig. 72). I think Leidy must have mistaken the undulatory motion of 

 the muscular cords for the vibration of bands of cilia, for I have found 

 that individuals with abundant cilia are rare. 



The nucleus is situated near the anterior extremity of the parasite ; 

 it is oval and homogeneous, or finely granular, and sometimes (Fig. 66) 

 shows a single darker structure like a nucleolus. The nucleus vai'ies in 

 size from 9 X 5.5 /a to 5.5 X 3.6/x. 



The motions of the living Dinenympha are exceedingly interesting, 

 but Leidy has amply described them. 



Dinenympha, like its companion parasites, lives on solid food ; but it 

 possesses no discoverable oral aperture. 



4. Gregarinida. 



Plate 6, Figs. 73-76. 



Leidy ('81, p. 441) speaks of having only once noticed a small Gre- 

 garine among the other parasites of Termes. I have, however, found 

 Gregarines very common in some hosts. They are found, almost with- 



