Harring and Myers—The Rotifers of Wisconsin. 
573 
lamellar tooth, projecting diagonally towards the left; the margin 
of this tooth, as well as the inner edge of the dorsal portion of 
both rami, is striated, but not denticulate. Opposite this tooth 
the left ramus is excavate ventrally, and at its highest anterior 
point there are six small, blunt teeth. The right uncus has a 
strong, club-shaped ventral tooth, followed by a second, much 
smaller tooth, and a third tooth which is again smaller than the 
second; following these there is a rudimentary, almost linear, 
diagonal tooth, starting from the base of the third tooth and 
crossing to the tip of a linear tooth, just inside the dorsal margin 
of the plate uniting all the teeth. The left uncus has a strong 
ventral tooth, similar to the opposing right tooth, and is followed 
by a much smaller second tooth and a linear rudiment of a third 
tooth; from the base of this third tooth a diagonal, linear tooth 
crosses the uncus to the tip of the linear tooth near the dorsal 
margin of the uncus. To the ventral edge of the first, large tooth 
there is loosely attached a very slender, linear tooth, which 
separates readily from the uncus when the trophi are treated with 
hypochlorite; there is no counterpart on the right side. The 
manubria are very robust, with a broad, central, nearly straight 
stem and a lamellar, subsquare anterior portion, the width of 
which is nearly one half the length of the entire manubrium. A 
pair of curved rods, attached at their ventral ends to the inner 
surface of the rami, pass under the manubria and terminate be¬ 
low the dorsal tips of the rami; they are imbedded in the walls 
of the mastax and aid in their support during the pumping ac¬ 
tion. The oesphagus is long and slender. Stomach and intestine 
are not distinctly separated. The gastric glands are of normal 
size and form. The ovary is slightly elongate transversely to the 
axis of the body and somewhat irregular in outline. A bladder 
of normal size is present. There are four foot glands, one pair 
fairly large and the other quite small. 
The retrocerebral sac is pyriform and reaches nearly to the end 
of the mastax; the subcerebral glands are only half the length of 
the sac. Bacteroids are very numerous in the glands, where they 
are generally collected in irregular clumps; in the vacuolate sac 
there are only a few granules scattered among its contents. The 
eye-spot is a large lenticular body at the posterior end of the 
ganglion. 
Total length 450—500/*,; toes 30-33y; trophi 55/x. 
