RESEARCHES IN HELMINTHOLOGY AND PARASITOLOGY. 1 59 



Filar ia, a more intimate knowledge of its structure may prove it to 

 be different. For the present it was proposed to distinguish it with 

 the name of Filaria restiforniis. (Drawing. ) 



[1880 No 486. See Bibliography.] 



PARASITES OF THE TERMITES.* 



Gregarina. 



Grcgarina Termitis. Plate 52, Fig. 27. 



A small Grcgari)ia was once noticed in our Termite, and is repre- 

 sented in Fig. 27. The bod^^ is ovoid with the narrower end poste- 

 rior. The head spheroid compressed from above downward. Length 

 0.06 mm. ; head 0.018 mm. long, 0.03 broad ; bod}- 0.036 mm. broad. 



Of the vegetal parasites found in association with the animal forms, 

 within the small intestine of our Termite, there are two kinds ; one 

 a species of vibrio, the other an attached algoid, to which I formerly 

 gave the name of Arthro))ntiis. 



Vibrio. 



llbrio Teniiifis. Plate 52, Figs. 36-39. 



Vibrios occur in great numbers as an associate of Trichoyiyinpha 

 and DinenympJia. They resemble most nearly the / 'ilnio serpens of 

 MitUer, as described by Dujardin, Cohn, and others. Under the 

 highest powers of the microscope at my command, one-tenth objec- 

 tive of Wailes, of Smith and Beck, and No. 11 immersion objective 

 of Hartnack, the}- appear as immeasurably fine lines, usually rang- 

 ing from 0.03 mm. to 0.045 mm. in length ; but, in extreme, ranging 

 from 0.015 to 0.06 mm. in length. They usually appear rectilinear 

 and regularly undulant, with from three to five or six waves. They 

 commonly remain stationary- in position and undulate more or less 

 rapidly, but they often advance or recede with variable rapidity, and 

 sometimes become quiescent. Occasionally they bend at an obtuse 

 angle while continuing to undulate, and sometimes they become zig- 

 zag. Mosth' they wave with regularity, sometimes irregularly, and 

 occasionall}' the ordinary number of their waves is doubled. The 

 smallest individuals, 0.015 mm. in length, are straight, but in move- 

 ment become bent in the segment of a circle or become sigmoid. 



The vibrios move in all directions among their associates. Not 

 unfrequently numbers adhere together by one end and form radiating 

 groups, as represented in Fig. 3S. 



* Journal Acad. Nat. Sci., Vol. 8, pp. 425-448. { rilustrated.) 



