Earring and Myers—The Rotifers of Wisconsin. 601 
length, and abruptly reduced to acute points, one eighth the 
length of the toe. 
The dorsal and lateral antennae are minute setigerous papillae 
in the normal positions. 
The corona has two strongly ciliated areas corresponding to the 
auricles of other species, but not evertile. The buccal field is 
evenly ciliated and continued down on the ventral side of the 
body for nearly one third of its length as a very narrow, parallel¬ 
sided band, resembling the chin of Notommata copeus. The cir- 
cumapical eiliation has completely disappeared. 
The mastax is of a highly specialized virgate type; it is re¬ 
markable for being at the end of a very long pharyngeal tube, and 
its functions are consequently limited to suction alone, a fact 
which is made still more evident by the extremely simple form 
of the trophi, adapted exclusively to the support of the walls of 
the mastax. The fulcrum is a long, slender rod, incurved at 
its posterior end and disconnected from the incus, or at least 
very loosely connected to it; under the action of solvents it sep¬ 
arates almost at once from the rami. These are strongly curved 
and have prominent alulae, the general outline being lyrate with 
the tips nearly meeting dorsally. The incus is approximately at a 
right angle to the fulcrum. The manubria are long, very slender 
rods, with a slight ventral curvature at the posterior end, and 
an anterior crescent-shaped expansion. The unci are two straight, 
very slender, divergent rods, resting with one end on the rami 
and the other on the median, rod-like portion of the manubrium. 
The posterior portion of the mastax is occupied by the rudimen¬ 
tary salivary glands, which are apparently no longer functional, 
thus recalling the mastax of Notomma pseudocerberus, described 
by de Beauchamp. The gastric glands, stomach-intestine, and 
ovary are normal; a bladder does not appear to be present. The 
foot glands are long, slender, and slightly club-shaped. 
The retrocerebral organ consists of a small, rounded sac and 
two large subcerebral glands, more than twice the length of the 
sac; no bacteroids are present. The ganglion is large and sub¬ 
square ; there is no eye-spot. 
Total length 220-250/a; toes 7-8/a; trophi 15/a. 
Notommata contorta is not rare in swampy ponds, although it 
does not occur in large numbers. 
