602 Wisconsin Academy of Sciences , Arts, and Letters . 
This species is easily recognizable by the elongate form of the 
body and by its never ceasing, worm-like contortions, which evi¬ 
dently suggested the specific name to Stokes. 
Notommata Trypeta Harring and Myers, new species 
Plate L, figures 5-8 
The body is short and stout, its greatest width being nearly 
one third of the total length. The integument is soft and flex¬ 
ible, but the outline is fairly constant. 
The head and neck together form a single segment; its length 
is nearly equal to the width, about three fourths of the greatest 
width of the body. The anterior transverse fold is well marked. 
The abdomen increases very slightly in width for three fourths 
of its length; posteriorly it is rounded and ends in a small tail 
with a single rounded median lobe. The foot is relatively long, 
fairly stout, and obscurely two-jointed. The toes are short, about 
one sixteenth of the total length; at the base they are very large 
and then abruptly reduced, recurved and incurved, resembling the 
chela of a decapod crustacean. 
The corona has two lateral tufts of strong cilia, resembling 
auricles, but neither retractile nor evertile; it continues down on 
the ventral side with a few scattered, weak cilia. 
The dorsal and lateral antennae are minute setigerous papillae 
in the normal positions. 
The mastax is of a modified virgate type. The rami are 
elongate, slightly curved, triangular plates without any denticu- 
lation. The fulcrum is a straight, slightly tapering rod, enlarged 
at the posterior end. The unci are extremely small, triangular 
plates, resting on the tips of the rami. The manubria are very 
slender, double-curved rods; at the posterior end there is an ir¬ 
regular enlargement with a ventrally projecting, oval lamella. The 
epipharynx consists of two large, very thin, triangular lamellae; 
the points project very slightly through the mouth. The oesoph¬ 
agus, gastric glands, and ovary are normal; a sharp constriction 
separates the stomach from the intestine. No bladder is present. 
The foot glands are long, slender, and slightly club-shaped. 
The ganglion is large and ovate; the only indication of a re- 
trocerebral organ is a cup-shaped cell, filled with pigment and 
surrounding the eye-spot at the posterior end of the ganglion. 
Total length 150/x; toes 9/x; trophi 16^ long, 22[x wide. 
