Earring and Myers—The Rotifers of Wisconsin. 627 
anterior transverse folds are not strongly marked. The abdomen 
is nearly cylindric, tapering slightly and gradually to the in¬ 
conspicuous, rounded tail, which is not lobate. The foot has two 
rather short, broad joints, continuing the general outline of the 
body without any marked constriction. The anterior foot joint 
has a minute, blunt median lobe, projecting slightly over the last 
foot joint. The toes are very short and conical, slightly com¬ 
pressed laterally, and slightly pinched just below the base; the 
tips are slightly blunted. Their length is about one twentieth of 
the total length. 
The dorsal antenna is somewhat further back than usual; the 
lateral antennae have not been observed. 
The corona extends down the ventral side about one third the 
length of the body; the post-oral portion projects as a slight chin. 
The auricles are very robust and carry a tuft of close-set, long 
cilia, continuous with the corona. 
The mastax differs somewhat from the typical form of this 
genus. Seen from the ventral side, it has a strikingly triangular 
aspect, due to the presence of two large, pyriform salivary glands, 
lying in the ventral angles of the mastax and crowding the pos¬ 
terior ends of the manubria outward. The rami are lyrate, with 
very large alulae and a fairly long, right-angled, dorsal extension, 
on which the unci rest. The fulcrum is as long as the rami, 
slender and tapering. The unci have three teeth, united by a 
plate-like web. The ventral tooth is only half the length of the 
uncus, but very large and obtusely conical. The second and third 
teeth rest with their base on the manubrium and the tip on the 
dorsal extension of the rami; the second tooth is well developed; 
the third is very slender, almost linear, and forms the dorsal 
edge of the uncial plate. The ventral branch of the manubrium 
is of the normal crescent shape but somewhat smaller than usual, 
and forms an approximately right angle with the nearly straight 
median branch. The dorsal branch is short, and forms the an¬ 
terior margin of a broad lamella projecting dorsally from the 
median branch of the manubrium. 
The epipharynx consists of two symmetrical, roughly hammer¬ 
shaped pieces. The crutched ends are immediately behind the 
mouth; the main stem extends diagonally backward and toward 
the dorsal side, tapering gradually to a thread-like tip; near the 
middle, on the inner side, is a tooth-like projection. The oesopha¬ 
gus is short and slender. The gastric glands, stomach-intestine, 
