THE PARASITES OF THE TERMITES. 43 



They, however, show what seems to be an approach to both conditions indicated. 

 Their structure consists of an indistinctly granular basis with coarser granules, 

 but the anterior extremity to a variable extent is clearer or devoid of the coarser 

 granules, and there is no trace of differentiation between endosarc and ectosarc. 

 A nucleus if present is completely obscured from view. 



Cils clothe the entire body of the young Trichonympha, and though of consider- 

 able length are not remarkably so as in the mature animals, nor do they exhibit 

 the distinction of several ranks or series as in the latter. The cils appear to 

 originate in opposite spiral lines crossing each other, and give to the animal a 

 more or less imbricate appearance with a serrated aspect on the lateral outlines. 

 The cils fold backward and outward from the head and become longer posteriorly. 



The young Trichoni/mpha advances, in a rather slow, shuffling manner, wrig- 

 gling slightly from side to side, and sometimes elongating and shortening. The 

 cils wave with moderate rapidity in a flowing manner outwardly and backward. 



Sometimes individuals are to be seen intermediate in character with those 

 above described and the mature Trichonympha, as represented in Fig. 11. In this 

 state the creature is ovoid with the narrower extremity conical and directed for- 

 ward. It exhibits a marked differentiation of structure into two parts, and also a 

 distinct central nucleus, but presents no distinction of integument. The posterior 

 part of the body is distinctly and somewhat coarsely granular, while the anterior 

 part is more transparent and homogeneous. The animal is invested with cils 

 resembling those of the mature animal, but apparently starting from spiral lines 

 on the anterior clearer division of the body. The individual represented was 0.06 

 mm. long by 0.036 mm. wide. 



What may be said of the character and position of Trichonympha in the 

 animal series'? It bears considerable resemblance to a Gregarina. Both exhibit 

 the same general form and division into two parts ; and both possess an equally 

 consistent integument or ectosarc impenetrable to the passage of food, and decid- 

 edly contractile. Trichonympha usually appears to contain more or less solid 

 food, which, being the case, must enter by a mouth the position of which I failed 

 to detect. Gregarina does not take solid food, and, therefore, needs no mouth. 



The interior substance of Trichonympha, or endosarc in two divisions, as in 

 Gregarina, is of more consistent character, and does not present the fluent condi- 

 tion in the latter. The nucleus of Trichonympha appears to occupy the anterior 

 division of the endosarc, and is fixed in position; in Gregarina it occupies the 

 posterior division of the endosarc, and is readily displaced in the flow of the 

 latter. 



