612 Wisconsin Academy of Sciences, Arts, and Letters. * 
but the stomach is produced into a number of gastric caeca; 
there are four of these on the anterior wall, and four ventral and 
two small posterior ones in the tail. The ovary and bladder are 
normal. The foot glands are nearly cylindric and somewhat 
longer than the foot. 
The ganglion is small and has a large eye-spot on the ventral 
side, which appears disk-shaped in dorsal view. No retrocerebral 
organ is present. 
Total length 240-275/a; length of foot 35—40/x; toes 24^28/a; 
trophi 50/a. 
Birgea enantia was found in considerable numbers in a swampy 
pond near Eagle Biver, Vilas County, Wisconsin. A single speci¬ 
men was collected at Bargaintown, near Atlantic City, New 
Jersey, some years ago. 
The taxonomic position of this species is very uncertain. While 
the trophi proper have a certain resemblance to those of the 
Asplanchnids, this is probably fortuitous; at any rate there is 
nothing else in the anatomy pointing in this direction. It may 
with some plausibility be connected with the Proales group; while 
this is as yet without definite limits, the three species described 
here show some points of resemblance to Birgea; the incus is 
nearly straight, rather elongate, and of relatively simple form, 
the teeth of the unci resemble the primitive malleate type, and 
a fairly well developed, paired epipharynx is present in all three 
spcies, notably in Proales sordida. The structure of the corona 
does not disprove this assumption; if anything it is in favor of 
it. The form of the body is very different, but the importance 
of this in the taxonomy of rotifers is still an open question; it 
may be of unequal value in the different groups. 
We take great pleasure in naming this genus for Dr. E. A. 
Birge, president of the University of Wisconsin and of the Wis¬ 
consin Geological and Natural History Survey. 
Drilophaga Vejdovsky 
Drilophaga Judayi Harring and Myers, new species 
Plate LII, figures 6-8 
The body is elongate and spindle-shaped, with some indistinct 
transverse folds. The cuticle is soft and flexible and the entire 
body very transparent. The anterior portion of the head is 
