640 Wisconsin Academy of Sciences, Arts, and Letters. 
to the seizure of prey has taken place in accordance with the 
carnivorous mode of life of this species. The rami are roughly 
triangular and nearly symmetrical. Near mid-length they are 
bent at a nearly right angle and armed with two well developed 
teeth on each ramus. There is a large, lozenge-shaped ventral 
opening between the rami, and they are abundantly supplied 
with ribs and webs to transmit the pull of the very strong mus¬ 
cles. The fulcrum is a very broad plate, serving for the attach¬ 
ment of the powerful abductor muscles; the posterior ventral 
edge is cut off diagonally. The unci have a large, subsquare 
basal plate with a single very large and strong ventral tooth, and 
from the junction of the tooth and basal plate a diagonal rib 
crosses to a point near the dorsal edge, opposite the dorsal rib of 
the manubrium. At the median dorsal angle of the basal plate 
there is a triangular, lamellar, striated expansion of the marginal 
rib; this probably assists, with its mate, in subdividing the food. 
The manubrium has a strong, nearly straight central section, 
expanded anteriorly into a broad triangular plate, and it is di¬ 
rected diagonally toward the dorsal side. In front of the rami, 
immediately behind the mouth, there are two tripod-like sclerified 
pieces, serving for the support of the lips. The salivary glands 
are rudimentary. 
The oesophagus is long, wrinkled longitudinally, and very dis¬ 
tensible, permitting a large organism to pass into the stomach. The 
gastric glands are large and nearly spherical. There is no con¬ 
striction between the stomach and the intestine. The bladder is 
normal. The foot glands are long and slightly club-shaped, dis¬ 
charging into a moderately large mucus reservoir at the base of 
the toes. The ovary is very large and irregularly ovate; the nuclei 
are deeply buried in its tissues, so that they are not easily seen. 
The ganglion is rather small and saccate. The retrocerebral 
organ consists of a small, clear sac and two subcerebral glands, 
as large as the sac; they do not contain bacteroids. The eye-spot 
is a large, lenticular or saucer-shaped body at the posterior end 
of the ganglion; it is on the inner side, and thus appears as a 
circular disc when seen from the dorsal side. 
Total length 450-475/*,; toes 25-28/*,; trophi 72/*,. 
Eosphora tJierina was found in a small puddle containing only 
a couple of gallons of water, which had gathered in a slight de¬ 
pression in the mud pumped up from the Potomac River at the 
