Harring & Myers—Rotifer Fauna of Wisconsin — II. 443 
NOTOMMATA EPAXIA Harring and Myers, new species. 
Plate XXI, figures 1-5. 
The body is very slender and almost cylindric; its greatest width 
is less than one fifth of the total length. The integument is very 
fiexible, but the outline is quite constant. It is a very transparent 
species. 
The head and neck segments are separated by a slight trans¬ 
verse fold and a second and somewhat deeper fold divides the 
neck from the abdomen; the length of these two segments is nearly 
equal to their width. The abdomen is cylindric for nearly its en¬ 
tire length; posteriorly it is rapidly reduced to the base of the foot. 
The tail has a single, moderately large, rounded lobe. The foot 
has two joints, the posterior very short, the anterior somewhat 
broader and longer. The toes are short, straight cones; their 
length is about one twentieth of the total length. The abdomen is 
longitudinally fluted dorsally and laterally; the ventral surface is 
smooth. 
The dorsal antenna is a small setigerous pit in the normal posi¬ 
tion; the lateral antennae have not been observed. 
The corona extends down on the ventral side about one fourth 
of the length of the body; the post-oral portion projects slightly 
from the body, forming a chin. The rostrum or cuticular fold on 
the apical plate is well marked. The auricles are rather small 
and provided with strong tufts of cilia, continuous with the 
corona. 
The mastax is of the virgate or pumping type, but differs from 
the normal in having two large salivary glands on the ventral 
side, in the angles between the mallei and fulcrum. The trophi 
are robust and slightly asymmetric. The fulcrum is long, slender 
and tapering towards the posterior end, which is slightly expanded 
and incurved. The ventral portion of the rami is triangular; at 
the apex there is a strong, blunt tooth, and the inner margin of 
the dorsal portion is denticulate. There is a narrow, oval opening 
between the rami on the ventral side, below the anterior tooth; 
the edge of the right ramus opposite this opening is smooth, while 
the left ramus is denticulate and striate. The unci have a sub¬ 
square, lamellar basal plate; the ventral tooth is large and clubbed 
at the tip. The right uncus has two small, slender teeth close to 
the ventral tooth; from their base a diagonal rib crosses the uncus 
to the dorsal margin, where it joins a very slender fourth tooth. 
