Earring c§ Myers—Rotifer Fauna of Wisconsin — 11. 525 
glands. The eyespot is large and at the posterior end of the 
ganglion. 
Total length 300-500/x; toes 20-35^; trophi 50/x long, 60/x wide. 
Eosphora thoa is rare; we have found only a few specimens in 
‘‘Cemetery pond,” near Eagle River, Vilas County, Wisconsin, 
and at Bargaintown, near Atlantic City, New Jersey. In external 
appearance it resembles E. anthadis so closely that it is virtually 
impossible to separate them. However, their behavior is very differ¬ 
ent; E. anthadis is a very slow swimmer and generally sluggish 
in its movements, while E. thoa swims very fast and is constantly 
changing its direction. The eyespot is sufficient to distinguish the 
species, and the trophi show but slight resemblances. It should be 
noted that E. anthadis is found only in moderately hard waters, 
while E. thoa occurs only in very soft water, so that there is really 
no great danger of confusion. 
Genus ENTEROPLEA Ehrenberg. 
Notommatid rotifers with short, very stout, saccate, illoricate 
body; the head is short and broad, the neck well marked; the ab¬ 
domen is slightly pyriform and ends in a short, sleevelike tail; two 
deep dorsal grooves at the points of attachment of the retractor 
muscles; the foot is short and indistinctly two-jointed; the toes 
are short and bladeshaped. 
The corona is frontal and consists of a marginal wreath of strong 
cilia and a transverse arc of moderately long cilia separating the 
apical plate and the unciliated buccal field. 
The mastax is a modified form of the virgate type, adapted to 
prehension; the fulcrum is short and broad, the rami lyrate and 
very powerful, denticulate on the inner margin; the unci have a 
single, very large tooth, clubbed at the point; the manubria are 
short and broad; two rudimentary salivary glands are present. 
The gastric glands are very long and ribbonlike; on the dorsal 
side of the stomach are four long, tubular, glandular appendages. 
The retrocerebral organ is rudimentary; both sac and glands 
are present. Two eyespots are seated on small knobs on the apical 
plate. 
Type of the genus.—Enteroplea lacustris Ehrenberg. 
