438 Wisconsin Academy of Sciences, Arts, and Letters. 
apophyses take the form of long, conical, divergent, hornlike 
prongs. The right ramus has near the base a lamellar projection, 
curving towards the left and with five or six marginal denticles; 
this is followed by four widely spaced, short, conical teeth on the 
inner edge, the last one terminal. The left ramus has, opposite the 
lamellar projection of the right ramus, two short teeth, very close 
together, followed by three widely spaced teeth. The right uncus 
has seven, and the left six, well developed teeth, clubbed at the 
tips and united by a thin basal plate; each ramus has an additional, 
imperfect tooth at the ventral margin. The manubria are moder¬ 
ately long and have a broad basal plate. The piston is rudi¬ 
mentary. 
The oesophagus is long and slender. The stomach and intestine 
are separated by a slight constriction. The gastric glands, ovary 
and bladder are normal. The two pyriform foot glands are within 
the body and discharge through long, very slender ducts through 
the single toe. 
The ganglion is very large and saccate; the eyespot is on the 
ventral side, close to the mastax and apparently affected by its 
movements. No retrocerebral organ is present. 
Total length 250-300/x; toes 20-25ju-; trophi 25 /a. 
Proales doliaris is not rare in regions with very soft water; we 
have found it in ponds and pools in Oneida and Vilas Counties, 
Wisconsin, and around Atlantic City, New Jersey. 
The propriety of placing this species in the genus Proales may 
be open to question; there can be none as to its removal from 
Mikrocodides, which is related to Cyrtonia and not at all to the 
Notommatids. However, if it is not to be made the type of a new 
genus, on account of the somewhat aberrant structure of the mas- 
tax, the assignment to Proales seems unobjectionable. 
Genus PROALINOPSIS Weber. 
Notommatid rotifers with fusiform, illoricate body, with a well- 
marked constriction separating head and abdomen; there is a 
gradual reduction of the diameter of the body towards the tail; 
the foot is short and two-jointed, with two fairly long toes; on the 
tail or the basal foot joint is a knoblike papilla with a tuft of 
setae or a spine. 
The corona is an oblique disc with short marginal cilia and two 
lateral, auricle-like areas with very long cilia; the apical plate is 
