436 Wisconsin Academy of Sciences, Arts, and Letters, 
The dorsal and lateral antennae are minute setigerous papillae 
in the normal positions. 
The corona is slightly oblique; the marginal wreath has laterally 
two auricle-like tufts of strong cilia for propulsion through the 
water. The apical plate is small and unciliated; the buccal field is 
covered with closely set, short cilia. The mouth is near the ventral 
edge of the corona. 
The mastax is closely related to the malleate type, but appears 
to have a weak piston, attached to the ventral wall and not to the 
fulcrum. The incus is nearly straight; the rami are broadly tri¬ 
angular and crenate on their inner margins; the basal apophysis 
is very large and projects above the general surface of the rami. 
The fulcrum is very short and all but rudimentary. The right 
uncus has five, and the left four teeth; the ventral tooth is large 
and slightly clubbed at the tip, while the remaining teeth are much 
smaller and more slender. The manubrium is unusual in form, as 
only the central cell, or stem, is developed; there is no trace of 
the lateral, usually lamellar cells; it tapers from the base to near 
mid-length and ends in a slender, rod-like distal portion, slightly 
incurved at the tip. The epipharynx consists of two fairly large, 
triangular plates, imbedded in the anterior walls of the mastax, 
above the basal apophysis of the rami and immediately in front 
of the unci. 
The oesophagus is relatively short and slender. The gastric 
glands are small and rounded. There is no distinct separation be¬ 
tween the stomach and intestine. The ovary and bladder are nor¬ 
mal. The foot glands are very minute and probably not functional. 
The ganglion is fairly large end saccate. A rudimentary sac is 
fused to the posterior end of the ganglion; the duct is present, but 
does not reach the anterior surface of the head. There is no eye- 
spot. 
Total length 80-1 00/a ; toes 12-1 8/x ; trophi 12/a long, 10/a wide. 
Proales minima seems to be rare; it was found by Montet in moss 
that had been kept for months; we have found it under similar 
circumstances. The sphagnum in which it occurred had been col¬ 
lected in Long Pond on the Pocono plateau by Paul Lukenbach, 
of Bethlehem, Pennsylvania. 
