Harring and Myers—The Rotifers of Wisconsin. 
603 
Notommata trypeta is parasitic in the Cyanophycean Gompho ■- 
sphaeria; the material on which this description is based was 
collected in pools on the southwestern shore of Lac Yieux Desert, 
Vilas County. Nearly every colony had its parasite, but no ani¬ 
mals were found free-swimming; when removed forcibly from the 
algal host, they swim rapidly about in search of a new colony. 
It was not discovered how the animal manages to penetrate the 
tough gelatinous matrix; the feeble trophi seem to be very poorly 
adapted to this purpose. 
Proales Gosse 
proales decipiens (Ehrenberg) 
Plate LI, figures 5-8 
Notommata decipiens Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831) 
1832: 132; Infusionsth. (1838), p. 431, PI . 52, fig. 6.— Tessin, Arch. 
Naturg. Mecklenburg 43 (1890): 143, PI. 1, fig. 5. 
Notommata vermzcul\aris Dujardin, Hist. Nat. Zooph. (1841), p. 648, 
PI. 21, fig. 7.— Eckstein, Zeitscbr. Wiss. Zool. 39 (1883): 362, PI. 
25, fig. 29.— Plate, Jenaische Zeitschr. Naturw. 19 (1886): 23. 
Proales decipiens Hudson and Gosse, Rotifera (1886) 2: i36, PI. 18, fig. 
6.-— Skorikov, Trav. Soc. Nat. Kharkow 30 (1896): i290.— Weber, 
Rev. iSuisse Zool. 5 (1898): 466, Pi. 18, figs. 16, 17.— Voigt, For- 
schungsber. Biol. Stat. Plon. 11 (1904): 41; Susswasserfauna 
Deutscblands, pt. 14 (1912): 90, fig. 158.— de Beauchamp, Arch. 
Zool. Exp. IV, 10 (1909): 160.— Weber and Montet, Cat. Invert. 
Suisse, fasc. 11 (1918): 100. 
? Taphrocampa clavigera Stokes, Ann. Mag. Nat. Hist. VI, 18 (1896): 
18, PI. 7, fig. 2. 
Pleurotrocha decipiens von Hofsten, Arkiv Zool., Stockholm 6 1 (1909): 
12 . 
The body of this species is elongate, slender, and fusiform; its 
greatest width is one fourth of the total length. The integument 
is soft and flexible, but the outline is quite constant. The entire 
body is very transparent. 
The length of the head segment is a little greater than its 
width, which is approximately one half of the greatest width of 
the body; it is rounded anteriorly, and this portion is separated 
from the head proper by a slight transverse fold; this section cor¬ 
responds to the rostrum of the forcipate Notommatids. The neck 
segment is rather short and slightly wider than the head. The 
