606 Wisconsin Academy of Sciences, Arts, and Letters. 
The corona is frontal and has a strongly ciliated lateral area, 
serving for locomotion; this corresponds to the auricles of the 
genus Notommata. 
The mastax is of a primitive virgate type and has considerable 
resemblance to the malleate form. The incus is nearly straight 
and the fulcrum triangular. The rami have a large basal 
apophysis of complicated form; their inner edges are without 
teeth. The right uncus has five, and the left four, well developed 
teeth, decreasing in size from the ventral to the dorsal side 
and united by a plate-like web. The anterior portion of the 
manubrium is a broad plate of irregular outline; posteriorly it 
is prolonged as a slightly curved, short rod. In front of the 
mastax there is an epipharynx, the two parts of which are asym¬ 
metric and consist of an irregularly curved plate with a short, 
rod-like lateral projection. 
The oesophagus is long and slender. The gastric glands are 
normal in form and position. The stomach and intestine are 
separated by a marked constriction. The ovary is very large and 
somewhat elongate. The bladder is small. There are two pairs 
of foot glands, one pair rudimentary and the other quite small; 
they discharge through a mucus reservoir at the base of the toes. 
To the posterior end of the large ganglion is fused a hemis¬ 
pherical retrocerebral sac, which presents the usual vacuolate ap¬ 
pearance and is ductless. The eye-spot consists of a clear globule 
with a disc of red pigment behind it, and it is placed some distance 
to the right of the median line, at the junction surface of gang¬ 
lion and sac. 
Total length 275-300/*; toes 15/*; trophi 48/*. 
Proales sordida is not very common; we have collected it at 
several stations in Wisconsin, but always in small numbers. 
This species is recognizable by the terminal corona, slender, 
fusiform body, asymmetric eye-spot, and the small spur over the 
foot. It is uncertain how many of the literature references 
really do concern this species, as Gosse’s description is so incom¬ 
plete. We submitted specimens to Mr. Rousselet, who verified 
our identification and informed us that this is Gosse’s species, ac¬ 
cording to tradition. The animal has a habit of curving the body 
toward the dorsal side, and nearly always dies in this position. 
