580 Wisconsin Academy of Sciences, Arts, and Letters. 
to the median dorsal angle. To the point of the right uncial 
tooth are attached two very small pre-uncial teeth, and to the 
left three still smaller teeth; it is possible that these supplemen¬ 
tary teeth perform the functions normally belonging to the 
atrophied dorsal teeth of the unci. The anterior half of the 
manubria is a broad, angular plate, continued posteriorly as a 
nearly straight rod, the tip of which curves outward and toward 
the ventral side. A pair of curved rods, gradually widening 
toward their dorsal ends, are attached to the inner ventral surfaces 
of the rami and meet dorsally some distance below the tips of the 
rami, thus supporting the external walls of the mast ax during 
the pumping action. The oesophagus is fairly long; stomach and 
intestine are not separated by any constriction. The gastric 
glands are rather smaller than usual. The ovary is of the usual, 
slightly irregular form. A small bladder is present. The foot 
glands are of medium size and pyriform. 
The retrocerebral sac is large and almost spherical; it opens 
on the corona through a long, tubular duct and is so crowded 
with baeteroids as to appear black by transmitted light. The sub¬ 
cerebral glands are rudimentary and fused with the ganglion. 
The eye-spot is large, but is usually visible only from the side on 
account of the opacity of the sac. 
Total length 325-350/x; toes 16—20/x; trophi 36/x. 
Notomma aurita is widely distributed; it seems to be most 
abundant in the spring, immediately after the ice leaves the ponds; 
later in the year it is not very common. 
IMotommata Augusta Harring and Myers, new species 
Plate LII, figures 9-12 
The body is elongate, nearly parallel-sided, and quite slender, 
its greatest width being only one fifth of the total length. The 
integument is very flexible, but the outline is nevertheless fairly 
constant. It is a moderately transparent species. 
The width of the head and neck segments is slightly greater 
than their length and very little less than the greatest width of 
the body. The head is strongly convex or bluntly pointed an¬ 
teriorly, and on ithe ventral side the mouth region forms a de¬ 
cided elevation above the general surface of the corona. The 
