Earring and Myers—The Rotifers of Wisconsin. 589 
the well-developed retrocerebral organ, and the short, conical 
toes; it has a superficial resemblance to Proales decipiens, but 
the corona and auricles are distinctive. An examination of the 
trophi is in any case sufficient for determination. 
notommata tripus Ehrenberg 
Plate XLIX, figures 9-13 
? Vorticella felis Muller, Verm. Terr. Fluv. I 1 (1773): 108; Anim. 
Infus. (1786), p. 301, PI. 43, figs. 1-5. 
? Eeclissa felis Schrank, Fauna Boica 3 2 (1803): 109. 
? Furcularia felis Lamarck, Hist. Nat. Anim. sans Vert. 2 (1816): ,39. 
? Distemma felis Ehrenberg, Isis (Oken) 26 (1833): col. 247. 
Notommata tripus Ehrenberg, Infusionsth. (1838), p. 434, PI. 50, fig. 4. 
—Leydig, Zeitschr. Wiss. Zool. 6 (1854): 37, PI. 3, fig. i28.— Plate, 
Jenaische Zeitschr. Naturw. 19 (1886): 24.— Hudson and Gosse, 
Rotifera (1886) 2: 22, PI. 17, fig. 4.— Wierzejski, Rozpr. Akad. 
Umiej. Wydz. Mat.-Przyr. Krakow II, 6 (1893): 228.— Skorikov, 
Trav. Soc. Nat. Kharkow 30 (1896): 286.— Weber, Rev. Suisse 
Zool. 5 (1898): 443, PI. 17, figs. 19, 20.— von Hofsten, Arkiv Zool., 
Stockholm 6 1 (1909): 34.— Lie-Pettersen, Bergens Mus. Aarbog 
(for 1909) 1910 15 : 39.— Voigt, Susswasserfauna Deutschlands, pt. 
14 (1912): 97, fig. 176.— Mola, Ann. Biol. Lac. 6 (1913): 241.— 
Weber and Montet, Cat. Invert. Suisse, fasc. 11 (1918): 113. 
? Plagiognatha felis Dujardin, Hist. Nat. Zooph. (1841), p. 652. 
? Notommata onisciformis Perty, Mittheil. Naturforsch. Ges. Bern 
1850: 19; Zur Kenntn. kleinst. Lebensf. (1852), 39, PI. 1, fig. 3. 
Notommata pilarius Gosse, Hudson and Gosse, Rotifera (1886) 2: 23, 
PI. 17, fig. 5.— Levander, Acta iSoc. Fauna et Flora Fennica 12 3 
(1895): 30. — Lie-Pettersen, Bergens Mus. Aarbog (for 1909) 
1910 15 : 40. 
Notommata miraMlis Stokes, Ann. Mag. Nat. Hist. VI, 18 (1896): 26, 
PI. 8, figs. 20, 21. 
The body is very short and broad, its greatest width being 
about two fifths of the total length. The integument is very 
rigid, almost semi-loricate, and the outline constant. It is fairly 
transparent. 
The head and neck form a single short and very broad seg¬ 
ment, its width being about three fourths of the greatest width 
of the body; dorsally it has a very large hump, which makes the 
head appear almost squarely truncate anteriorly. The single an¬ 
terior transverse fold is well marked. The abdomen increases 
gradually in width to a point about mid-length and is rounded 
