Marring and Myers—The Rotifers of Wisconsin. 607 
proales parasita (Ehrenberg) 
Plate LI, figures 1-4 
Notommata parasita Ehrenberg, Infusionsth. (18i38),p. 426, PI. 50, fig. 1. 
—Cohn, Zeitschr. Wiss. Zool. 9 (1858): 291, PI. 13, figs. 8, '9. 
Proales parasita Rousselet, Proc. Royal Irish Acad. 31, pt. 51, (1911): 8. 
—Voigt, iSusswasserfauna Deutschlands, pt. 14 (1912): 89, fig. 155. 
The body is short, stout, and fusiform; its greatest width 
is nearly one third of the total length. The integument is very 
flexible, but the outline is fairly constant. The stomach is usually 
so filled with chlorophyl that it is difficult to make out the in¬ 
ternal organs. 
The width of the head segment is nearly equal to its length, 
and but little less than the greatest width of the body; it is 
truncate anteriorly. The neck segment is only half the length of 
the head and a trifle narrower. The anterior transverse folds 
are well marked. The abdomen increases very slightly in width 
for one half its length and then tapers gradually to the foot. The 
tail is not very prominent; it has a single, rounded, median lobe. 
The foot is vevry broad and obscurely two-jointed and continues 
the general outline of the body without any marked constriction. 
The toes are large at the base and taper abruptly to acute points. 
The dorsal and lateral antennae are small setigerous papillae 
in the normal position. 
The corona is frontal and has two lateral, strongly ciliated 
areas, corresponding to the auricles of the genus Notommata. 
The mastax is of a modified virgate type. The fulcrum is a 
long, straight, slender, tapering rod; the rami are somewhat asym¬ 
metric, the right side being more developed than the left. The 
basal apophysis is a nearly semicircular plate, thickened at the 
edge and directed towards the ventral side. The rami are ir¬ 
regularly pentagonal in ventral view. The unci have three rudi¬ 
mentary teeth, united by a thin lamella. The manubria are ex¬ 
panded into broad plates at the anterior end and continue as 
slender, slightly curved rods. Imbedded in the walls of the mas- 
tax, immediately behind the mouth, are two slender, curved rods, 
which represent a rudimentary epipharynx. 
The oesophagus is long and slender. The gastric glands, 
stomach-intestine, ovary, and bladder are normal. The foot glands 
