534 Wisconsin Academy of Sciences, Arts, and Letters. 
In the ventral angles of the mastax are two well developed salivary 
glands. 
The oesophagus is moderately long and slender. There is no 
constriction between the stomach and intestine. The ovary is very 
long and ribbon-shaped and passes dorsally over the stomach into 
the head segment. The gastric glands and bladder are normal. 
The foot glands are slender, slightly clubshaped and nearly as 
long as the foot. 
The ganglion is large and saccate. At its posterior end is a 
small, spherical, ductless retrocerebral sac and two granular areas 
at the external angles of the ganglion appear to represent the re¬ 
mains of the subcerebral glands. The two eyespots are on rounded,, 
knoblike projections between the lateral arcs of cilia. 
Total length 275-300/x; toes 35-30/^; trophi 62/^. 
Sphyrias lofuana is not rare in weedy ponds around Washing¬ 
ton, District of Columbia; we have found it also near Atlantic 
City, New Jersey, and at Dock Lake, near Spooner, Wisconsin. 
In spite of the somewhat aberrant external form this species 
is closely related to Eosphora and Eotkinia, as shown by a com¬ 
parison of the mastax and corona. Its food seems to consist prin¬ 
cipally of the smaller Bdelloids and ConocJiilus, whose trophi are 
often found in the stomach. 
Grenus MONOMMATA Bartsch. 
Notommatid rotifers with slender, elongate ovate, spindle-shaped, 
illoricate body, with a slight constriction behind the mastax, sep¬ 
arating the head and abdomen; the foot is very short and ob¬ 
scurely two-jointed; the toes are extremely long, nearly twice the 
length of the body, and unequal, the right toe longer than the left. 
The corona is slightly oblique and consists of a marginal wreath 
of cilia with lateral, auricle-like tufts of longer cilia adapted to 
propulsion; the apical plate is unciliated and the buccal field 
evenly covered with short, close-set cilia; the mouth is somewhat 
below the center of the corona. 
The mastax is intermediate between the virgate and forcipate 
type; the rami are lyrate and the inner margins armed with one 
or more strong teeth immediately below the mouth opening; the 
unci have three unequally developed, long, slender, clubbed teeth j 
the manubria are broad and lamellar at the base; the piston is 
