Earring (& Myers—Rotifer Fauna of Wisconsin — II, 445 
two minute lateral lobes. The foot is two-join ted and very short; 
the basal joint does not project beyond the tail. The two toes are 
short, slender and conical; their inner margins are nearly straight 
and the outer slightly curved; the length is about one sixteenth 
of the total length. 
The corona extends down on the ventral side about one fourth 
the length of the body; the post-oral portion projects from the 
body as a fairly prominent chin. The auricles are short and stout, 
with robust tufts of cilia, continuous with the corona. 
The dorsal and lateral antennae are small setigerous papillae 
in the normal positions. 
The mastax is of the normal virgate type and the trophi some¬ 
what asymmetric. The fulcrum is long and slender and tapers 
towards the posterior end, which is slightly expanded and in¬ 
curved. The rami have fairly deep transverse grooves below 
the accessory teeth of the unci; the right ramus has in front of 
this groove a broad, subsquare, lamellar tooth, projecting diagon¬ 
ally towards the left; the anterior margin is coarsely dentate. The 
dorsal section of the rami immediately below the unci is strongly 
curved and the inner, opposing edges crenate. The right uncus 
has a linear ventral tooth, followed by a strong, clubshaped tooth; 
behind this are two smaller, clubshaped teeth, very close together, 
and from their base a diagonal rib crosses the uncus to unite with 
a linear, rudimentary tooth just inside the dorsal margain of the 
basal plate uniting all the teeth. The left uncus has a linear 
ventral tooth and a stout, clubshaped tooth, larger than its mate 
on the opposite side; close to this there is a second, somewhat 
smaller tooth. From the base of this a somewhat curved, rudi¬ 
mentary fourth tooth crosses the basal plate diagonally; nearly 
parallel to this and separated from it by a considerable space is 
a rudimentary fifth tooth. 
Short accessory teeth are attached to the ventral edges of the 
unci at their tips; the right uncus has four very slender teeth, 
and the left three broad, obtuse teeth, successively decreasing in 
size. The central section of the manubrium is very stout and 
curves towards the ventral side at the tip; the basal plate is large 
and irregular in outline. A pair of curved rods, attached at their 
ventral ends to the inner surfaces of the rami, pass under the 
manubria and terminate below the dorsal tips of the rami; they 
are imbedded in the walls of the mastax and assist in supporting 
them during the pumping action. 
