594 Wisconsin Academy of Sciences, Arts, and Letters. 
is at the posterior end of the ganglion; it is very large, flattened, 
and disk-shaped. 
Total length 100/a; toes 8/a; trophi 22/a. 
Notommata pygmaea occurs rather sparingly in swampy ponds 
near Atlantic City, New Jersey. 
This very small species is readily recognized by its short, stout 
body and by the form of the toes. 
notommata saccigera Ehrenberg 
Plate XLVXI, figures 1-5 
Notommata saccigera Ehrenberg, Abh. Akad. Wiss. Berlin (for 1831) 
1832: 133; Infusionsth. (1838), p. 434, Pi. 50, fig. 8.—? Hudson and 
Gosse, Rotifera (1886) 2: 24, PI. 17, fig. 2.— Wierzejski, Rozpr. 
Akad. Umiej. Wydz. Mat.-Przyr. Krakow II, 6 (1893): 228. —Ln>- 
Pettersen, Bergens Mus. Aarbog (for 1909) 191 0 15 : 42.— Mola, Ann. 
Biol. Lac. 6 (1913): 242. 
The body of this species is fusiform, short, stout, and strongly 
gibbous posteriorly; its greatest width is more than one third of 
the total length. The integument is leathery and the outline 
constant. The color is slightly brownish, and the animal is not 
very transparent. 
The head segment is short and very broad; its width is fully 
two thirds of the greatest width of the body. A transverse fold 
separates the head from the neck, but there is no separation be¬ 
tween neck and abdomen; the latter increases very gradually in 
width for about half its length and is truncate and strongly gib¬ 
bous posteriorly, falling off abruptly to the very small tail, which 
has only a single, rounded, median lobe. The foot has two very 
short and narrow joints. The toes are minute, conical, slightly 
decurved, and blunted at the tips; their length is less than one 
twenty-fifth of the total length. 
The dorsal and lateral antennae are small setigerous papillae 
in the normal positions. 
The corona extends down on the ventral side more than one 
third of the entire length; the post-oral portion projects from 
the surface of the body as a fairly prominent chin. The auricles 
are short and very stout, almost triangular; the ciliation is con¬ 
tinuous with the corona. 
