600 Wisconsin Academy of Sciences, Arts, and Letters. 
by an expansion of the cloaca and is transversely elongate. The 
foot glands are moderately large, slender, and slightly club-shaped; 
at the base of the toes are two very small accessory foot glands. 
The retrocerebral organ is well developed; the sac is large 
and pyriform and usually contains numerous bacteroids, collected 
principally immediately behind the eye-spot; the subcerebral 
glands are fully as long, and nearly as large, as the sac. The 
ganglion is fairly large and saccate; at its posterior end is the 
large eye-spot. 
Total length 500-600/*; toes 30-35/*; trophi 45/*. 
Notommata pseudocerberus is widely distributed in the United 
States, but in very small numbers. It was first described by de 
Beauchamp from ponds at Chaville (Seine-et-Oise) and later col¬ 
lected at other localities in France; at first identified with Notom¬ 
mata cerberus (Gosse), it was later recognized as a different species 
and given a new name. Dr. de Beauchamp has kindly sent us 
material from the type locality for comparison with our American 
specimens, which seem to be on the average somewhat smaller in 
size. 
Notommata contorta (Stokes) 
Plate LVIII, figures 5-8 
Diglena contorta Stokes, Ann. Mag. Nat. Hist. VI, 19 (1897): 630, PI. 
14, fig. 5. 
Notommata contorta Harring, U. S. Natl. Mus. Bull. 81 (1913): 78. 
The body is elongate, sprindle-shaped, and very slender; its 
greatest width is only about one eighth of the total length. The 
integument is very flexible and the outline constantly changing. 
No anterior transverse folds are present to indicate the bounda¬ 
ries of the head and neck; the frontal margin of the head pro¬ 
jects as a blunt knob, corresponding to the rostrum of the forcipate 
Notommatids, Notommata pseudo cerberus and a few other species. 
The width of the head is nearly equal to the greatest width of the 
body, while the neck is only about two thirds as wide. The ab¬ 
domen increases very gradually in width for about two thirds of 
its length and then tapers rapidly to the base of the minute, 
three-lobed tail. The very small foot appears to have only a single 
joint. The toes are very short, about one thirtieth of the total 
