OF DENISON UNIVERSITY. 65 



This species is found in ponds containing plant life. Sessile 

 vorticellidae are often found attached to the lorica of this species. 

 Sometimes they are situated at the cephalad extremity of the lorica, 

 evidently appropriating a portion of the food attracted by the cilia of 

 the Brachionus ; while in other cases these vorticellidae are attached 

 to other parts of the lorica. 



Sp. 25. Brachionus militaris, Ehrenberg. 



Brachionus militaris, * * * Hudson and Gosse, The Rotifera 



or Wheel-animalcules; sup., p. 52; pi. XXXIV, fig. 23. 



Brachionus militaris, C. L. Herrick, Bull. Sci. Lab. of 



Denison Univ., Vol. I, p. 56; pi. X, fig. 10. 



During mid summer this species was abundant in all of our weedy 

 pools. It seems to be fond of wallowing in the debris that is found 

 at the bottom of such pools. 



Sp. 25. Brachionus tubercuhts^ s >>- »• 

 [Plate 1; Fig. 6.] 



Lorica sub-rectangular, slightly wider than long (spines excluded), 

 warted. The cephalo-dorsad margin is supplied with six teeth. The 

 middle teeth are much larger than any of the others. Next in size 

 come the lateral teeth. Between the two middle teeth there is a nar- 

 row, concave excavation. The cephalo-ventrad margin of the lorica 

 is feebly convex. This margin is supplied with four small, sub-equal 

 crenations. Two of these are situated, one near each lateral surface 

 of the lorica; the remaining two are located near the meson. Be- 

 tween the two sub-median crenations there is a shallow concave exca- 

 vation. The laterad margins of the lorica are convex. The caudad 

 margin is straight. At its corners it is supplied with two long spines ; 

 these spines are more than half the length of the body of the lorica. 

 The orifice for the protrusion of the foot is guarded by two small, 

 unequal spines. 



The whole lorica is densely covered with small tubercles, hence 

 the name. These tubercles are found even upon the larger teeth of 

 the cephalad margin and upon the spines. In a few individuals the 

 spines appeared to be unwarted. The foot is very flexible. 



During mid-summer this species was very abundant around the 

 roots of the duckweeds [Lemnacea polyrrhiza, L.), of one of our larger 

 ponds. 



