638 Wisconsin Academy of Sciences, Arts, and Letters. 
auricle-like area of strongly developed cilia; the ventral arcs 
meet immediately below the mouth. The buccal field is faintly 
ciliate. 
The mastax is of a specialized virgate type, which has lost 
the pumping action and become adapted to the seizure of prey, 
as this species is carnivorous. The trophi differ but slightly 
from thos of Eosphora tJCerina; they are, however, still more 
robust. The rami are approximately triangular, and the two 
sides are nearly alike. They are bent at a nearly right angle at 
a point near mid-length, where they are provided with two strong 
teeth on each ramus. There is a large, irregularly lozenge¬ 
shaped ventral opening between the rami, and they are provided 
with intricately shaped bars, with ribbed edges, to resist defor¬ 
mation under the pull of the very robust muscles. The fulcrum 
is a very broad plate; the posterior ventral edge is cut off dia¬ 
gonally, approximately at a right angle to the pull of the power¬ 
ful abductor muscles, which are attached here. The unci have 
a large, subsquare basal plate with a single, very large and 
strong ventral tooth, the free length of which is nearly equal 
to the length of the basal plate; from the junction of the tooth 
and the 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, which probably 
acts as a shearing tooth. The manubrium has a strong, nearly 
straight central section, curving slightly toward the ventral side 
at its extreme posterior end; anteriorly it is expanded into a 
broad triangular plate, and it is directed diagonally toward the 
dorsal side. In front of the rami, immediately behind the mouth, 
there are two tripod-like selerified pieces, serving for the sup¬ 
port of the mouth. The mastax has two large ventral salivary 
glands, the left gland nearly as long as the fulcrum, the right 
somewhat longer. 
The stomach is very large and without distinct separation from 
the intestine. The gastric glands are large and ovate. A con¬ 
tractile bladder is present. The foot glands are fully as long as 
the foot and slightly compressed laterally, no mucus reservoir being 
present. The ovary is irregularly ovate and fills the ventral por¬ 
tion of the body from the mastax to the bladder; the nuclei are very 
large and of irregular polygonal outline. 
