518 Wisconsin Academy of Sciences, Arts, and Letters. 
the cloaca. Two well developed foot glands are present, indicating 
that the single toe is of recent origin. The ovary is normal. 
The ganglion is large and nearly circular; at its posterior end 
is a lenticular, pigmented body which seems to be partly eyespot 
and partly a rudimentary retrocerebral sac. 
Total length 175-250/x; toes 18-24/x; trophi 18/x. 
Tylotrocha monopus is fairly common in certain localities. We 
have collected it in shallow ponds in Vilas and Oneida Counties, 
and limnetic in lakes in Washburn and Sawyer Counties, Wiscon¬ 
sin, and Polk County, Florida; it is common in ponds around At¬ 
lantic City, New Jersey. Jennings found it in Lake Michigan, as 
well as in inland lakes in Michigan. 
Genus E.ESTICULA Harring and Myers, new genus. 
Notommatid rotifers with very slender, spindle-shaped, illoricate 
body, nearly cylindric anteriorly and tapering gradually from 
mid-length to the base of the toes, without reduction in diameter 
of the foot; the two toes are short and usually have a bulbous en¬ 
largement at the base, containing a small mucus reservoir. 
The corona is frontal or slightly oblique, with a marginal wreath 
of short cilia and two lateral, auricle-like tufts of long cilia for 
propulsion; the buccal field is covered with short, close-set cilia. 
The mastax is virgate and adapted to prehension, but still re¬ 
tains the pumping action unimpaired; the fulcrum is long and 
slender; the rami are triangular and nearly symmetrical, with a 
right-angled bend near mid-length; the unci have a single well 
developed tooth; the epipharynx is rudimentary or absent. Two 
large salivary glands are present. 
The retrocerebral organ consists of a small, rounded, ductless 
sac. The eyespot, when present, is a loosely aggregated mass of 
red pigment granules, diffusing among the vacuoles of the sac. 
Type of the genus.—Besticula melandocus (Gosse) = Furcularia 
melandocus Gosse. 
RESTICUIiA MELANDOCUS (Gosse). 
Furcularia melandocus Gosse, Journ. Royal Micr. Soc., 1887, p. 2, pi. 1,. 
fig. 4.— Hudson and Gosse, Rotifera, Suppl., 1889, p. 27, pi. 31, fig. 18. 
—Bilfinger, Jahresh. Naturk. Wiirttemberg, vol. 50, 1894, p. 47.—VoiGT^ 
‘Siisswasserfauna Deutschlands, pt. 14, 1912, p. 102, fig. 189. 
Notommata melandocus Harking, Bull. 81 U. S. Nat. Mus., 1913, p. 79. 
