530 Wisconsin Academy of Sciences, Arts, and Letters. 
the rami; they serve as supports during the pumping action. The 
piston is well developed. 
The oesophagus is slender and moderately long. The stomach 
and intestine are not separated by any constriction. The gastric 
glands and ovary are normal. The cloaca appears to function as a 
bladder. The foot glands are large, nearly circular and slightly 
compressed; they discharge into a small, spherical mucus reser¬ 
voir, which is partly in the bulbous, basal enlargement of the toe. 
The ganglion is moderately large and nearly spherical. The 
retrocerebral sac is pyriform and very small; the subcerebral glands 
are short and always contain a rounded mass of bacteroids at the 
level of the cervical eyespot, thus producing the appearance of 
three eyespots in a transverse row. There are two accessory fron¬ 
tal eyespots on the apical plate in addition to the cervical eyespot 
at the posterior end of the ganglion. 
Total length 175-250^; toes 25-35/x; trophi 28/x long, 35 wide. 
Eothinia triphaea occurs in small numbers among sphagnum 
growing on the margins of shallow ponds. We have found it 
widely distributed in Vilas and Oneida Counties, Wisconsin, and 
also in ponds around Atlantic City, New Jersey, and at Hyatts- 
ville, near Washington, District of Columbia. 
EOTHINIA ARGUS Harring and Myers, new species. 
Plate XLI, figures 6-11. 
The body of this species is fusiform and moderately elongate; 
its greatest width is about one fourth of the total length. The in¬ 
tegument is moderately flexible and the outline fairly constant. 
It is a very transparent animal. 
The transverse folds limiting the head and neck segments are 
well marked. The head segment is very broad anteriorly and 
tapers towards the neck; its width is equal to the width of the 
abdomen. The neck segment is considerably narrower than the 
head. The abdomen is nearly cylindric for three fourths of its 
length and rounded posteriorly. The tail is small and three-lobed; 
the median lobe is subsquare and the lateral lobes rounded. The 
foot has two short joints of nearly equal length. The toes are 
slender, conical, acutely pointed and slightly decurved; their length 
is about one fourteenth of the total length. 
The corona is slightly oblique and terminates a short distance 
behind the mouth. The apical plate is strongly convex and un- 
