Harring (fr Myers—Rotifer Fauna of Wisconsin — II. 523 
tooth, adapted to prehension; a rudimentary epipharynx is usually 
present. There are two salivary glands, the right much larger than 
the left and frequently curving under the fulcrum. 
The retrocerebral organ is small, but both sac and glands are 
present. The eyespot is cervical, at the posterior end of the gang¬ 
lion; two accessory frontal eyespots are found in some species. 
Type of the genus.—Eosphora najas Ehrenberg. 
The genera Eothinia and Besticula are very closely related to 
Eosphora, but seem to form natural groups with the included 
species agreeing in so many important characters (corona, mastax, 
retrocerebral organ, form of body, etc.), that generic separation 
appears advisable. 
EOSPHORA THOA Harring and Myers, new species. 
Plate XXXIX, figures 1-5. 
The body is broad and very robust; its greatest width is one 
third of the total length. The integument is very flexible and the 
animal highly contractile. The entire body is hyaline. 
The head and neck segments are fused and separated from the 
abdomen by a well marked constriction; the corona is as wide as 
the body at its widest point. The abdomen tapers gradually from 
a point near mid-length to the base of the foot, and ends in a broad, 
but not very prominent tail. The foot is conical and very stout; 
it is without joints, but irregularly wrinkled. Its length is about 
one fourth of the entire length. The two toes are heart-shaped in 
dorsal view, ending in very fine points; the ventral edge is straight, 
while the dorsal is strongly curved; their length is about one fif¬ 
teenth of the total length. In young animals the abdomen is 
faintly striate or plicate dorsally. 
The corona is frontal and consists of a marginal wreath of cilia, 
interrupted dorsally and passing in a curve to the lateral angles 
where it is joined by an inner arc, starting also from the dorsal 
gap; from the angles the corona continues as a single band, closed 
ventrally and passing immediately below the mouth. The buccal 
field is evenly ciliated. On the apical plate are two large papillae, 
each with a tuft of sensory setae. There is no indication of the 
accessory eyespots usually present on these papillae in other species 
of this genus. 
