Harring & Myers—Botifer Fauna of Wisconsin — II. 453 
wide as the body and rounded posteriorly; it is separated from 
the abdomen by a deep transverse groove. The foot is short and 
very broad; it has no joints. The toes are rather short, slender, 
conical and slightly decurved; their length is about one fifteenth 
of the length of the body, and they are separated by an interspace 
of nearly half their length. 
The dorsal antenna is a minute setigerous pit in the normal po¬ 
sition ; the lateral antennae have not been observed. 
The corona is strongly oblique and extends down on the ventral 
side about one fourth of the length of the body; the post-oral por¬ 
tion projects very slightly from the body, but does not form a 
chin. The auricles are small and rounded; the ciliation is con¬ 
tinuous with the corona. The mouth is nearly in the center. 
The mastax is virgate with very slender and slightly asymmetric 
trophi of a simple type. The fulcrum is long and slender, tapering 
gradually to the posterior end, which is expanded into an oval 
plate for the attachment of the muscles of the piston. The rami 
are approximately triangular in ventral view and have well de¬ 
veloped alulae, ending in acute points; the right ramus has below 
the apex a small, blunt tooth, fitting into a recess on the left 
ramus. On the external edge of the rami there is a strongly curved 
dorsal extension, which forms a nearly right angle with the rami; 
a deep sinus separates it anteriorly from the points of the rami. 
The unci have two teeth, of which the ventral one is more robust 
than the second tooth; the basal plate is very narrow and lamellar, 
with a rudimentary tooth at its dorsal edge. The manubria are 
slightly curved near the base; the posterior portion is straight and 
very slender, ending in a spatulate expansion, which curves slightly 
inwards. The piston is very large and fills the entire cavity of 
the mastax. 
The oesophagus is moderately long and begins high up on the 
mastax. The gastric glands, ovary and bladder are normal. There 
is a slight constriction between the stomach and intestine. The 
foot glands are small and pyriform. 
The ganglion is large and saccate. The retrocerebral organ 
consists of a small, pyriform sac, usually filled with bacteroids. 
The eyespot is at the posterior end of the ganglion. 
Total length 175-200/x; toes 12-15ja; trophi 26/x. 
Taphrocampa annulosa is common everywhere in ponds and 
among wet mosses. It is closely related to Taphrocampa selenura, 
