Harring and Myers—The Rotifers of Wisconsin. 605 
seen to be indistinguishable from normal specimens of Proales 
decipiens. It is therefore probable that under certain conditions 
the sac may be filled with bacteroids, but normally it is perfectly 
transparent. No subcerebral glands are present. 
Total length 175-250 /a; toes 12-16/x; trophi 15/x long, 23/x wide. 
Proales decipiens is common everywhere in weedy ponds and is 
always abundant in wet sphagnum. 
This species is closely related to Proales sordida , but is 
distinguishable by its smaller size, somewhat stouter form, re¬ 
latively larger toes, and the oblique corona. 
PROALES SORDIDA GoSSe 
Plate LI, figures 9-12 
Proales sordida Gosse, Hudson and Gosse, Rotifera (1886) 2S: 37, PI. 
18, fig. 7.— Wierzejski, Rozpr. Akad. Umiej. Wydz. Mat-Frzyr. 
Krakow II, 6 (1893): 229.— Skorikov, Tray. Soc. Nat. Kharkow 30 
(1896): 291.— Voigt, Siisswasserfauna Deutschlands, pt. 14 (1912): 
90, fig. 159.— Mola, Ann. Biol. Lac. 6 (1913): 243.— Weber and 
Montet, Cat. Invert. Suisse, fasc. 11 (1918): 100. 
Pleurotrocha sordida Harring, U. S. Natl. Mus. Bull. 81 (1913): 85. 
The body is elongate, fusiform, and slender; its greatest width 
is somewhat less than one fourth of the total length. The integu¬ 
ment is soft and flexible, but the outline is fairly constant. The 
entire body is very transparent. 
There is no separation between the head and neck segments; 
the width of the two fused segments is about three fourths of 
the greatest width of the body, and their length is equal to the 
body width. There is a single, well marked, anterior transverse 
fold. The abdomen increases slightly in width for one half its 
length and then tapers gradually to the base of the foot, where 
there is a marked transverse fold. There is no distinct tail. The 
foot is very robust and fairly long, continuing the general out¬ 
line of the body without any marked reduction in size; no di¬ 
vision into joints is distinguishable. The toes are short, straight, 
and conical; the tips are abruptly reduced to acute points. The 
length of the toes is about one twentieth of the total length. At 
their base is a small, rounded, knob-like spur, projecting dorsally. 
The dorsal antenna is in the normal position; the lateral an¬ 
tennae are somewhat farther back than usual. 
