520 Wisconsin Academy of Sciences, Arts, and Letters. 
be used for prehension. The fulcrum is very long and slender, 
slightly incurved and expanded at the posterior end for the at¬ 
tachment of the muscles of the piston. The rami are broadly tri¬ 
angular in ventral view and have large, somewhat asymmetric 
alulae with a complicated system of reenforcing ribs. The basal 
apophysis is prominent and very broad; behind this there is a 
large oval ventral opening between the rami, continuing to the 
point where the teeth of the unci normally rest. The dorsal, curved 
portion of the rami is deeply striate and obtusely dentate on its 
inner margin. The unci have a very small, subsquare basal plate, 
traversed diagonally by a rudimentary tooth, finely striate at the 
tip; only one tooth in each uncus is functional. Five or six very 
short accessory teeth are attached to the tip of the left uncus, but 
none to the right. The central section of the manubrium tapers 
gradually to the posterior end; the basal plate is somewhat pent¬ 
agonal in outline. A slender, curved rod is imbedded in the walls 
of the mastax on each side just below, and parallel to, the posterior 
edge of the ramus; these rods assist in the support of the mastax 
during the pumping action. The salivary glands are very large 
and nearly of the same size. 
The oesophagus is slender and moderately long. The gastric 
glands are very small. A slight constriction separates the stomach 
from the intestine. The ovary and bladder are normal. The foot 
glands are small and pyriform; they discharge into a very small, 
spherical mucus reservoir at the base of the toes. 
The ganglion is large and saccate. The retrocerebral sac is fairly 
large, pyriform and vacuolate; it does not appear to contain bac- 
teroids. No subcerebral glands are present. The eyespot is a 
huge, lens-shaped disc attached to the posterior end of the gang¬ 
lion ; its diameter is two thirds of the width of the ganglion itself. 
Total length 250-300/1,; toes 12-15/i,; trophi 45/^. 
Besticula anceps is rare; we have only found a few specimens 
in a boggy area along Helen Creek, near Mamie Lake, Vilas County, 
Wisconsin. Its nearest relative is B. nyssa, but it is readily rec¬ 
ognized by its smaller size, the form of the corona and the eyespot, 
as well as the simpler toes. 
