604 Wisconsin Academy of Sciences, Arts, and Letters. 
anterior transverse folds are well marked. The abdomen increases 
very gradually in width for half its length and then tapers to the 
foot; it has a transverse fold on the posterior portion, behind the 
lateral antennae. The foot is short and broad, continuing the 
general outline of the body without marked reduction; it has only 
one joint. The toes are comparatively short, stout, and conical, 
ending in acute points; their length is about one sixteenth of the 
total length. 
The dorsal and lateral antennae are minute setigerous papillae 
in the normal positions. 
The corona is oblique and has laterally two strongly ciliated 
areas, corresponding to the auricles of other Notommatids. The 
ciliation of the buccal field does not extend beyond the mouth; 
as in the forcipate Notommatids, the circumapical band has dis¬ 
appeared. 
The mastax is virgate, but preserves much of the general ap¬ 
pearance of the malleate type. The incus is nearly straight; the 
fulcrum is triangular and terminates in a knob-like enlargement. 
The rami have a large basal apophysis and, near mid-length, two 
prominent teeth; the dorsal ends are pointed and also act as teeth. 
The right uncus has five, and the left four well developed teeth, 
gradually decreasing in size toward the dorsal side and united by 
a plate-like web. The manubria are broad, roughly triangular 
plates, reinforced by prominent ribs. In front of the rami are 
two epipharyngeal rods, bent at a right angle and with a knob¬ 
like enlargement at the apex. 
The oseophagus is long and slender. The gastric glands, 
ovary, and bladder are normal. The stomach is separated from 
the intestine by a marked constriction. The foot glands are very 
large and club-shaped. 
The ganglion is very large and saccate. The eye-spot is asym¬ 
metrically placed; in all the specimens we have examined it has 
been on the right side, but Yoigt reports that specimens collected 
by him in the Kleine Madebrocken See near Plon had the eye- 
spot on the left side. The sac is pyriform and appears to be 
somewhat variable in size; the figure represents average condi¬ 
tions. Some years ago material was collected in the Potomac 
River at Washington which agreed perfectly with Stokes’s descrip¬ 
tion of Taphrocampa clavigera; the sac was filled with bacteroids, 
and was jet black and opaque. When the animals were pre¬ 
served, the black color of course disappeared, and they were then 
